diff --git a/src/core/controllers/controllers_test.go b/src/core/controllers/controllers_test.go
index 1381a26d3..8aa6dd1e6 100644
--- a/src/core/controllers/controllers_test.go
+++ b/src/core/controllers/controllers_test.go
@@ -32,7 +32,7 @@ import (
 	"github.com/goharbor/harbor/src/common/models"
 	utilstest "github.com/goharbor/harbor/src/common/utils/test"
 	"github.com/goharbor/harbor/src/core/config"
-	"github.com/goharbor/harbor/src/core/proxy"
+	"github.com/goharbor/review/harbor/src/core/proxy"
 	"github.com/stretchr/testify/assert"
 )
 
diff --git a/src/core/controllers/proxy.go b/src/core/controllers/proxy.go
index 1ddaf9ca7..5fc7b31f5 100644
--- a/src/core/controllers/proxy.go
+++ b/src/core/controllers/proxy.go
@@ -2,7 +2,7 @@ package controllers
 
 import (
 	"github.com/astaxie/beego"
-	"github.com/goharbor/harbor/src/core/proxy"
+	"github.com/goharbor/harbor/src/core/middlewares"
 )
 
 // RegistryProxy is the endpoint on UI for a reverse proxy pointing to registry
@@ -14,10 +14,11 @@ type RegistryProxy struct {
 func (p *RegistryProxy) Handle() {
 	req := p.Ctx.Request
 	rw := p.Ctx.ResponseWriter
-	proxy.Handle(rw, req)
+	middlewares.Handle(rw, req)
 }
 
 // Render ...
 func (p *RegistryProxy) Render() error {
 	return nil
 }
+
diff --git a/src/core/main.go b/src/core/main.go
index 2c68141dd..d2b010097 100644
--- a/src/core/main.go
+++ b/src/core/main.go
@@ -35,7 +35,7 @@ import (
 	_ "github.com/goharbor/harbor/src/core/auth/uaa"
 	"github.com/goharbor/harbor/src/core/config"
 	"github.com/goharbor/harbor/src/core/filter"
-	"github.com/goharbor/harbor/src/core/proxy"
+	"github.com/goharbor/harbor/src/core/middlewares"
 	"github.com/goharbor/harbor/src/core/service/token"
 	"github.com/goharbor/harbor/src/replication"
 )
@@ -158,7 +158,9 @@ func main() {
 	}
 
 	log.Info("Init proxy")
-	proxy.Init()
+	if err := middlewares.Init(); err != nil {
+		log.Errorf("init proxy error, %v", err)
+	}
 	// go proxy.StartProxy()
 	beego.Run()
 }
diff --git a/src/core/middlewares/blobquota/handler.go b/src/core/middlewares/blobquota/handler.go
new file mode 100644
index 000000000..876fd2ef3
--- /dev/null
+++ b/src/core/middlewares/blobquota/handler.go
@@ -0,0 +1,104 @@
+package blobquota
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/json"
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"github.com/opencontainers/go-digest"
+	"github.com/pkg/errors"
+	"net/http"
+	"time"
+)
+
+type blobQuotaHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &blobQuotaHandler{
+		next: next,
+	}
+}
+
+func (bqh blobQuotaHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	if req.Method == http.MethodPut {
+		match, _ := util.MatchPutBlobURL(req)
+		if match {
+			dgstStr := req.FormValue("digest")
+			if dgstStr == "" {
+				http.Error(rw, util.MarshalError("InternalServerError", "blob digest missing"), http.StatusInternalServerError)
+				return
+			}
+			dgst, err := digest.Parse(dgstStr)
+			if err != nil {
+				http.Error(rw, util.MarshalError("InternalServerError", "blob digest parsing failed"), http.StatusInternalServerError)
+				return
+			}
+			// ToDo lock digest with redis
+
+			// ToDo read placeholder from config
+			state, err := hmacKey("placeholder").unpackUploadState(req.FormValue("_state"))
+			if err != nil {
+				http.Error(rw, util.MarshalError("InternalServerError", "failed to decode state"), http.StatusInternalServerError)
+				return
+			}
+			log.Infof("we need to insert blob data into DB.")
+			log.Infof("blob digest, %v", dgst)
+			log.Infof("blob size, %v", state.Offset)
+		}
+
+	}
+	bqh.next.ServeHTTP(rw, req)
+}
+
+// blobUploadState captures the state serializable state of the blob upload.
+type blobUploadState struct {
+	// name is the primary repository under which the blob will be linked.
+	Name string
+
+	// UUID identifies the upload.
+	UUID string
+
+	// offset contains the current progress of the upload.
+	Offset int64
+
+	// StartedAt is the original start time of the upload.
+	StartedAt time.Time
+}
+
+type hmacKey string
+
+var errInvalidSecret = errors.New("invalid secret")
+
+// unpackUploadState unpacks and validates the blob upload state from the
+// token, using the hmacKey secret.
+func (secret hmacKey) unpackUploadState(token string) (blobUploadState, error) {
+	var state blobUploadState
+
+	tokenBytes, err := base64.URLEncoding.DecodeString(token)
+	if err != nil {
+		return state, err
+	}
+	mac := hmac.New(sha256.New, []byte(secret))
+
+	if len(tokenBytes) < mac.Size() {
+		return state, errInvalidSecret
+	}
+
+	macBytes := tokenBytes[:mac.Size()]
+	messageBytes := tokenBytes[mac.Size():]
+
+	mac.Write(messageBytes)
+	if !hmac.Equal(mac.Sum(nil), macBytes) {
+		return state, errInvalidSecret
+	}
+
+	if err := json.Unmarshal(messageBytes, &state); err != nil {
+		return state, err
+	}
+
+	return state, nil
+}
diff --git a/src/core/middlewares/chain.go b/src/core/middlewares/chain.go
new file mode 100644
index 000000000..69d15a2af
--- /dev/null
+++ b/src/core/middlewares/chain.go
@@ -0,0 +1,110 @@
+package middlewares
+
+import (
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/middlewares/blobquota"
+	"github.com/goharbor/harbor/src/core/middlewares/contenttrust"
+	"github.com/goharbor/harbor/src/core/middlewares/listrepo"
+	"github.com/goharbor/harbor/src/core/middlewares/multiplmanifest"
+	"github.com/goharbor/harbor/src/core/middlewares/readonly"
+	"github.com/goharbor/harbor/src/core/middlewares/regquota"
+	"github.com/goharbor/harbor/src/core/middlewares/url"
+	"github.com/goharbor/harbor/src/core/middlewares/vulnerable"
+	"github.com/justinas/alice"
+	"net/http"
+)
+
+type DefaultCreator struct {
+	middlewares []string
+}
+
+func New(middlewares []string) *DefaultCreator {
+	return &DefaultCreator{
+		middlewares: middlewares,
+	}
+}
+
+// CreateChain ...
+func (b *DefaultCreator) Create() *alice.Chain {
+	chain := alice.New()
+	for _, mName := range b.middlewares {
+		middlewareName := mName
+		chain = chain.Append(func(next http.Handler) http.Handler {
+			constructor := b.getMiddleware(middlewareName)
+			if constructor == nil {
+				log.Errorf("cannot init middle %s", middlewareName)
+				return nil
+			}
+			return constructor(next)
+		})
+	}
+	return &chain
+}
+
+func (b *DefaultCreator) getMiddleware(mName string) alice.Constructor {
+	var middleware alice.Constructor
+
+	if mName == READONLY {
+		middleware = func(next http.Handler) http.Handler {
+			return readonly.New(next)
+		}
+	}
+	if mName == URL {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return url.New(next)
+		}
+	}
+	if mName == MUITIPLEMANIFEST {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return multiplmanifest.New(next)
+		}
+	}
+	if mName == LISTREPO {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return listrepo.New(next)
+		}
+	}
+	if mName == CONTENTTRUST {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return contenttrust.New(next)
+		}
+	}
+	if mName == VULNERABLE {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return vulnerable.New(next)
+		}
+	}
+	if mName == REGQUOTA {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return regquota.New(next)
+		}
+	}
+	if mName == BLOBQUOTA {
+		if middleware != nil {
+			return nil
+		}
+		middleware = func(next http.Handler) http.Handler {
+			return blobquota.New(next)
+		}
+	}
+
+	return middleware
+}
diff --git a/src/core/middlewares/config.go b/src/core/middlewares/config.go
new file mode 100644
index 000000000..c881b5075
--- /dev/null
+++ b/src/core/middlewares/config.go
@@ -0,0 +1,16 @@
+package middlewares
+
+// const variables
+const (
+	READONLY         = "readonly"
+	URL              = "url"
+	MUITIPLEMANIFEST = "manifest"
+	LISTREPO         = "listrepo"
+	CONTENTTRUST     = "contenttrust"
+	VULNERABLE       = "vulnerable"
+	REGQUOTA         = "regquota"
+	BLOBQUOTA        = "blobquota"
+)
+
+// sequential organization
+var Middlewares = []string{READONLY, URL, MUITIPLEMANIFEST, LISTREPO, CONTENTTRUST, VULNERABLE, BLOBQUOTA, REGQUOTA}
diff --git a/src/core/middlewares/contenttrust/handler.go b/src/core/middlewares/contenttrust/handler.go
new file mode 100644
index 000000000..5b9d7b4ed
--- /dev/null
+++ b/src/core/middlewares/contenttrust/handler.go
@@ -0,0 +1,89 @@
+package contenttrust
+
+import (
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/common/utils/notary"
+	"github.com/goharbor/harbor/src/core/config"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"net/http"
+	"strings"
+)
+
+var NotaryEndpoint = ""
+
+type contentTrustHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &contentTrustHandler{
+		next: next,
+	}
+}
+
+func (cth contentTrustHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	imgRaw := req.Context().Value(util.ImageInfoCtxKey)
+	if imgRaw == nil || !config.WithNotary() {
+		cth.next.ServeHTTP(rw, req)
+		return
+	}
+	img, _ := req.Context().Value(util.ImageInfoCtxKey).(util.ImageInfo)
+	if img.Digest == "" {
+		cth.next.ServeHTTP(rw, req)
+		return
+	}
+	if !util.GetPolicyChecker().ContentTrustEnabled(img.ProjectName) {
+		cth.next.ServeHTTP(rw, req)
+		return
+	}
+	match, err := matchNotaryDigest(img)
+	if err != nil {
+		http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", "Failed in communication with Notary please check the log"), http.StatusInternalServerError)
+		return
+	}
+	if !match {
+		log.Debugf("digest mismatch, failing the response.")
+		http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", "The image is not signed in Notary."), http.StatusPreconditionFailed)
+		return
+	}
+	cth.next.ServeHTTP(rw, req)
+}
+
+func matchNotaryDigest(img util.ImageInfo) (bool, error) {
+	if NotaryEndpoint == "" {
+		NotaryEndpoint = config.InternalNotaryEndpoint()
+	}
+	targets, err := notary.GetInternalTargets(NotaryEndpoint, util.TokenUsername, img.Repository)
+	if err != nil {
+		return false, err
+	}
+	for _, t := range targets {
+		if isDigest(img.Reference) {
+			d, err := notary.DigestFromTarget(t)
+			if err != nil {
+				return false, err
+			}
+			if img.Digest == d {
+				return true, nil
+			}
+		} else {
+			if t.Tag == img.Reference {
+				log.Debugf("found reference: %s in notary, try to match digest.", img.Reference)
+				d, err := notary.DigestFromTarget(t)
+				if err != nil {
+					return false, err
+				}
+				if img.Digest == d {
+					return true, nil
+				}
+			}
+		}
+	}
+	log.Debugf("image: %#v, not found in notary", img)
+	return false, nil
+}
+
+// A sha256 is a string with 64 characters.
+func isDigest(ref string) bool {
+	return strings.HasPrefix(ref, "sha256:") && len(ref) == 71
+}
diff --git a/src/core/middlewares/inlet.go b/src/core/middlewares/inlet.go
new file mode 100644
index 000000000..55f579a06
--- /dev/null
+++ b/src/core/middlewares/inlet.go
@@ -0,0 +1,25 @@
+package middlewares
+
+import (
+	"errors"
+	"github.com/goharbor/harbor/src/core/middlewares/registryproxy"
+	"net/http"
+)
+
+var head http.Handler
+
+// Init initialize the Proxy instance and handler chain.
+func Init() error {
+	ph := registryproxy.New()
+	if ph == nil {
+		return errors.New("get nil when to create proxy")
+	}
+	handlerChain := New(Middlewares).Create()
+	head = handlerChain.Then(ph)
+	return nil
+}
+
+// Handle handles the request.
+func Handle(rw http.ResponseWriter, req *http.Request) {
+	head.ServeHTTP(rw, req)
+}
diff --git a/src/core/middlewares/interface.go b/src/core/middlewares/interface.go
new file mode 100644
index 000000000..86381d8cd
--- /dev/null
+++ b/src/core/middlewares/interface.go
@@ -0,0 +1,7 @@
+package middlewares
+
+import "github.com/justinas/alice"
+
+type ChainCreator interface {
+	Create(middlewares []string) *alice.Chain
+}
diff --git a/src/core/middlewares/listrepo/handler.go b/src/core/middlewares/listrepo/handler.go
new file mode 100644
index 000000000..ea41a6557
--- /dev/null
+++ b/src/core/middlewares/listrepo/handler.go
@@ -0,0 +1,88 @@
+package listrepo
+
+import (
+	"encoding/json"
+	"github.com/goharbor/harbor/src/common/dao"
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"net/http"
+	"net/http/httptest"
+	"regexp"
+	"strconv"
+)
+
+const (
+	catalogURLPattern = `/v2/_catalog`
+)
+
+type listReposHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &listReposHandler{
+		next: next,
+	}
+}
+
+func (lrh listReposHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	var rec *httptest.ResponseRecorder
+	listReposFlag := matchListRepos(req)
+	if listReposFlag {
+		rec = httptest.NewRecorder()
+		lrh.next.ServeHTTP(rec, req)
+		if rec.Result().StatusCode != http.StatusOK {
+			util.CopyResp(rec, rw)
+			return
+		}
+		var ctlg struct {
+			Repositories []string `json:"repositories"`
+		}
+		decoder := json.NewDecoder(rec.Body)
+		if err := decoder.Decode(&ctlg); err != nil {
+			log.Errorf("Decode repositories error: %v", err)
+			util.CopyResp(rec, rw)
+			return
+		}
+		var entries []string
+		for repo := range ctlg.Repositories {
+			log.Debugf("the repo in the response %s", ctlg.Repositories[repo])
+			exist := dao.RepositoryExists(ctlg.Repositories[repo])
+			if exist {
+				entries = append(entries, ctlg.Repositories[repo])
+			}
+		}
+		type Repos struct {
+			Repositories []string `json:"repositories"`
+		}
+		resp := &Repos{Repositories: entries}
+		respJSON, err := json.Marshal(resp)
+		if err != nil {
+			log.Errorf("Encode repositories error: %v", err)
+			util.CopyResp(rec, rw)
+			return
+		}
+
+		for k, v := range rec.Header() {
+			rw.Header()[k] = v
+		}
+		clen := len(respJSON)
+		rw.Header().Set(http.CanonicalHeaderKey("Content-Length"), strconv.Itoa(clen))
+		rw.Write(respJSON)
+		return
+	}
+	lrh.next.ServeHTTP(rw, req)
+}
+
+// matchListRepos checks if the request looks like a request to list repositories.
+func matchListRepos(req *http.Request) bool {
+	if req.Method != http.MethodGet {
+		return false
+	}
+	re := regexp.MustCompile(catalogURLPattern)
+	s := re.FindStringSubmatch(req.URL.Path)
+	if len(s) == 1 {
+		return true
+	}
+	return false
+}
diff --git a/src/core/middlewares/multiplmanifest/handler.go b/src/core/middlewares/multiplmanifest/handler.go
new file mode 100644
index 000000000..bd18e09f2
--- /dev/null
+++ b/src/core/middlewares/multiplmanifest/handler.go
@@ -0,0 +1,33 @@
+package multiplmanifest
+
+import (
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"net/http"
+	"strings"
+)
+
+type MultipleManifestHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &MultipleManifestHandler{
+		next: next,
+	}
+}
+
+// The handler is responsible for blocking request to upload manifest list by docker client, which is not supported so far by Harbor.
+func (mh MultipleManifestHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	match, _, _ := util.MatchManifestURL(req)
+	if match {
+		contentType := req.Header.Get("Content-type")
+		// application/vnd.docker.distribution.manifest.list.v2+json
+		if strings.Contains(contentType, "manifest.list.v2") {
+			log.Debugf("Content-type: %s is not supported, failing the response.", contentType)
+			http.Error(rw, util.MarshalError("UNSUPPORTED_MEDIA_TYPE", "Manifest.list is not supported."), http.StatusUnsupportedMediaType)
+			return
+		}
+	}
+	mh.next.ServeHTTP(rw, req)
+}
diff --git a/src/core/middlewares/readonly/hanlder.go b/src/core/middlewares/readonly/hanlder.go
new file mode 100644
index 000000000..1bdb8b659
--- /dev/null
+++ b/src/core/middlewares/readonly/hanlder.go
@@ -0,0 +1,29 @@
+package readonly
+
+import (
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/config"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"net/http"
+)
+
+type readonlyHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &readonlyHandler{
+		next: next,
+	}
+}
+
+func (rh readonlyHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	if config.ReadOnly() {
+		if req.Method == http.MethodDelete || req.Method == http.MethodPost || req.Method == http.MethodPatch || req.Method == http.MethodPut {
+			log.Warningf("The request is prohibited in readonly mode, url is: %s", req.URL.Path)
+			http.Error(rw, util.MarshalError("DENIED", "The system is in read only mode. Any modification is prohibited."), http.StatusForbidden)
+			return
+		}
+	}
+	rh.next.ServeHTTP(rw, req)
+}
diff --git a/src/core/middlewares/registryproxy/handler.go b/src/core/middlewares/registryproxy/handler.go
new file mode 100644
index 000000000..eb0e43b05
--- /dev/null
+++ b/src/core/middlewares/registryproxy/handler.go
@@ -0,0 +1,107 @@
+package registryproxy
+
+import (
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/config"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+)
+
+type proxyHandler struct {
+	handler http.Handler
+}
+
+func New(urls ...string) http.Handler {
+	var registryURL string
+	var err error
+	if len(urls) > 1 {
+		log.Errorf("the parm, urls should have only 0 or 1 elements")
+		return nil
+	}
+	if len(urls) == 0 {
+		registryURL, err = config.RegistryURL()
+		if err != nil {
+			log.Error(err)
+			return nil
+		}
+	} else {
+		registryURL = urls[0]
+	}
+	targetURL, err := url.Parse(registryURL)
+	if err != nil {
+		log.Error(err)
+		return nil
+	}
+
+	return &proxyHandler{
+		handler: &httputil.ReverseProxy{
+			Director: func(req *http.Request) {
+				director(targetURL, req)
+			},
+			ModifyResponse: modifyResponse,
+		},
+	}
+
+}
+
+// Overwrite the http requests
+func director(target *url.URL, req *http.Request) {
+	targetQuery := target.RawQuery
+	req.URL.Scheme = target.Scheme
+	req.URL.Host = target.Host
+	req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path)
+	if targetQuery == "" || req.URL.RawQuery == "" {
+		req.URL.RawQuery = targetQuery + req.URL.RawQuery
+	} else {
+		req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
+	}
+	if _, ok := req.Header["User-Agent"]; !ok {
+		// explicitly disable User-Agent so it's not set to default value
+		req.Header.Set("User-Agent", "")
+	}
+}
+
+// Modify the http response
+func modifyResponse(res *http.Response) error {
+
+	if res.Request.Method == http.MethodPut {
+		// PUT manifest
+		matchMF, _, _ := util.MatchManifestURL(res.Request)
+		if matchMF {
+			if res.StatusCode == http.StatusCreated {
+				log.Infof("we need to insert data here ... ")
+			} else if res.StatusCode >= 202 || res.StatusCode <= 511 {
+				log.Infof("we need to roll back data here ... ")
+			}
+		}
+
+		// PUT blob
+		matchBB, _ := util.MatchPutBlobURL(res.Request)
+		if matchBB {
+			if res.StatusCode != http.StatusCreated {
+				log.Infof("we need to rollback DB and unlock digest ... ")
+			}
+		}
+	}
+
+	return nil
+}
+
+func singleJoiningSlash(a, b string) string {
+	aslash := strings.HasSuffix(a, "/")
+	bslash := strings.HasPrefix(b, "/")
+	switch {
+	case aslash && bslash:
+		return a + b[1:]
+	case !aslash && !bslash:
+		return a + "/" + b
+	}
+	return a + b
+}
+
+func (ph proxyHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	ph.handler.ServeHTTP(rw, req)
+}
diff --git a/src/core/middlewares/regquota/handler.go b/src/core/middlewares/regquota/handler.go
new file mode 100644
index 000000000..fe2b132ea
--- /dev/null
+++ b/src/core/middlewares/regquota/handler.go
@@ -0,0 +1,53 @@
+package regquota
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/docker/distribution"
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"io/ioutil"
+	"net/http"
+)
+
+type regQuotaHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &regQuotaHandler{
+		next: next,
+	}
+}
+
+//PATCH manifest ...
+func (rqh regQuotaHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	match, _, _ := util.MatchManifestURL(req)
+	if match {
+		var mfSize int64
+		var mfDigest string
+		mediaType := req.Header.Get("Content-Type")
+		if req.Method == http.MethodPut && mediaType == "application/vnd.docker.distribution.manifest.v2+json" {
+			data, err := ioutil.ReadAll(req.Body)
+			if err != nil {
+				log.Warningf("Error occured when to copy manifest body %v", err)
+				http.Error(rw, util.MarshalError("InternalServerError", fmt.Sprintf("Error occured when to decode manifest body %v", err)), http.StatusInternalServerError)
+				return
+			}
+			req.Body = ioutil.NopCloser(bytes.NewBuffer(data))
+
+			_, desc, err := distribution.UnmarshalManifest(mediaType, data)
+			if err != nil {
+				log.Warningf("Error occured when to Unmarshal Manifest %v", err)
+				http.Error(rw, util.MarshalError("InternalServerError", fmt.Sprintf("Error occured when to Unmarshal Manifest %v", err)), http.StatusInternalServerError)
+				return
+			}
+			mfDigest = desc.Digest.String()
+			mfSize = desc.Size
+			log.Infof("manifest digest... %s", mfDigest)
+			log.Infof("manifest size... %v", mfSize)
+		}
+	}
+
+	rqh.next.ServeHTTP(rw, req)
+}
diff --git a/src/core/middlewares/url/handler.go b/src/core/middlewares/url/handler.go
new file mode 100644
index 000000000..cfd893ef3
--- /dev/null
+++ b/src/core/middlewares/url/handler.go
@@ -0,0 +1,58 @@
+package url
+
+import (
+	"context"
+	"fmt"
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	coreutils "github.com/goharbor/harbor/src/core/utils"
+	"net/http"
+	"strings"
+)
+
+type urlHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &urlHandler{
+		next: next,
+	}
+}
+
+func (uh urlHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	log.Debugf("in url handler, path: %s", req.URL.Path)
+	flag, repository, reference := util.MatchPullManifest(req)
+	if flag {
+		components := strings.SplitN(repository, "/", 2)
+		if len(components) < 2 {
+			http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("Bad repository name: %s", repository)), http.StatusBadRequest)
+			return
+		}
+
+		client, err := coreutils.NewRepositoryClientForUI(util.TokenUsername, repository)
+		if err != nil {
+			log.Errorf("Error creating repository Client: %v", err)
+			http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("Failed due to internal Error: %v", err)), http.StatusInternalServerError)
+			return
+		}
+		digest, _, err := client.ManifestExist(reference)
+		if err != nil {
+			log.Errorf("Failed to get digest for reference: %s, error: %v", reference, err)
+			http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("Failed due to internal Error: %v", err)), http.StatusInternalServerError)
+			return
+		}
+
+		img := util.ImageInfo{
+			Repository:  repository,
+			Reference:   reference,
+			ProjectName: components[0],
+			Digest:      digest,
+		}
+
+		log.Debugf("image info of the request: %#v", img)
+		ctx := context.WithValue(req.Context(), util.ImageInfoCtxKey, img)
+		req = req.WithContext(ctx)
+	}
+	uh.next.ServeHTTP(rw, req)
+}
diff --git a/src/core/middlewares/util/util.go b/src/core/middlewares/util/util.go
new file mode 100644
index 000000000..6eb6ade6a
--- /dev/null
+++ b/src/core/middlewares/util/util.go
@@ -0,0 +1,144 @@
+package util
+
+import (
+	"encoding/json"
+	"github.com/goharbor/harbor/src/common/models"
+	"github.com/goharbor/harbor/src/common/utils/clair"
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/config"
+	"github.com/goharbor/harbor/src/core/promgr"
+	"net/http"
+	"net/http/httptest"
+	"regexp"
+	"strings"
+)
+
+type contextKey string
+
+const (
+	manifestURLPattern = `^/v2/((?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)+)manifests/([\w][\w.:-]{0,127})`
+	blobURLPattern     = `^/v2/((?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)+)blobs/uploads/`
+	ImageInfoCtxKey    = contextKey("ImageInfo")
+	// TODO: temp solution, remove after vmware/harbor#2242 is resolved.
+	TokenUsername = "harbor-core"
+)
+
+// ImageInfo
+type ImageInfo struct {
+	Repository  string
+	Reference   string
+	ProjectName string
+	Digest      string
+}
+
+// JSONError wraps a concrete Code and Message, it's readable for docker deamon.
+type JSONError struct {
+	Code    string `json:"code,omitempty"`
+	Message string `json:"message,omitempty"`
+	Detail  string `json:"detail,omitempty"`
+}
+
+// MarshalError ...
+func MarshalError(code, msg string) string {
+	var tmpErrs struct {
+		Errors []JSONError `json:"errors,omitempty"`
+	}
+	tmpErrs.Errors = append(tmpErrs.Errors, JSONError{
+		Code:    code,
+		Message: msg,
+		Detail:  msg,
+	})
+	str, err := json.Marshal(tmpErrs)
+	if err != nil {
+		log.Debugf("failed to marshal json error, %v", err)
+		return msg
+	}
+	return string(str)
+}
+
+// MatchManifestURL ...
+func MatchManifestURL(req *http.Request) (bool, string, string) {
+	re := regexp.MustCompile(manifestURLPattern)
+	s := re.FindStringSubmatch(req.URL.Path)
+	if len(s) == 3 {
+		s[1] = strings.TrimSuffix(s[1], "/")
+		return true, s[1], s[2]
+	}
+	return false, "", ""
+}
+
+// MatchPutBlobURL ...
+func MatchPutBlobURL(req *http.Request) (bool, string) {
+	if req.Method != http.MethodPut {
+		return false, ""
+	}
+	re := regexp.MustCompile(blobURLPattern)
+	s := re.FindStringSubmatch(req.URL.Path)
+	if len(s) == 2 {
+		s[1] = strings.TrimSuffix(s[1], "/")
+		return true, s[1]
+	}
+	return false, ""
+}
+
+// MatchPullManifest checks if the request looks like a request to pull manifest.  If it is returns the image and tag/sha256 digest as 2nd and 3rd return values
+func MatchPullManifest(req *http.Request) (bool, string, string) {
+	if req.Method != http.MethodGet {
+		return false, "", ""
+	}
+	return MatchManifestURL(req)
+}
+
+// CopyResp ...
+func CopyResp(rec *httptest.ResponseRecorder, rw http.ResponseWriter) {
+	for k, v := range rec.Header() {
+		rw.Header()[k] = v
+	}
+	rw.WriteHeader(rec.Result().StatusCode)
+	rw.Write(rec.Body.Bytes())
+}
+
+// PolicyChecker checks the policy of a project by project name, to determine if it's needed to check the image's status under this project.
+type PolicyChecker interface {
+	// contentTrustEnabled returns whether a project has enabled content trust.
+	ContentTrustEnabled(name string) bool
+	// vulnerablePolicy  returns whether a project has enabled vulnerable, and the project's severity.
+	VulnerablePolicy(name string) (bool, models.Severity)
+}
+
+// PmsPolicyChecker ...
+type PmsPolicyChecker struct {
+	pm promgr.ProjectManager
+}
+
+// ContentTrustEnabled ...
+func (pc PmsPolicyChecker) ContentTrustEnabled(name string) bool {
+	project, err := pc.pm.Get(name)
+	if err != nil {
+		log.Errorf("Unexpected error when getting the project, error: %v", err)
+		return true
+	}
+	return project.ContentTrustEnabled()
+}
+
+// VulnerablePolicy ...
+func (pc PmsPolicyChecker) VulnerablePolicy(name string) (bool, models.Severity) {
+	project, err := pc.pm.Get(name)
+	if err != nil {
+		log.Errorf("Unexpected error when getting the project, error: %v", err)
+		return true, models.SevUnknown
+	}
+	return project.VulPrevented(), clair.ParseClairSev(project.Severity())
+}
+
+// NewPMSPolicyChecker returns an instance of an pmsPolicyChecker
+func NewPMSPolicyChecker(pm promgr.ProjectManager) PolicyChecker {
+	return &PmsPolicyChecker{
+		pm: pm,
+	}
+}
+
+// GetPolicyChecker ...
+func GetPolicyChecker() PolicyChecker {
+	return NewPMSPolicyChecker(config.GlobalProjectMgr)
+}
diff --git a/src/core/middlewares/vulnerable/handler.go b/src/core/middlewares/vulnerable/handler.go
new file mode 100644
index 000000000..44762ac5e
--- /dev/null
+++ b/src/core/middlewares/vulnerable/handler.go
@@ -0,0 +1,57 @@
+package vulnerable
+
+import (
+	"fmt"
+	"github.com/goharbor/harbor/src/common/dao"
+	"github.com/goharbor/harbor/src/common/models"
+	"github.com/goharbor/harbor/src/common/utils/log"
+	"github.com/goharbor/harbor/src/core/config"
+	"github.com/goharbor/harbor/src/core/middlewares/util"
+	"net/http"
+)
+
+type vulnerableHandler struct {
+	next http.Handler
+}
+
+func New(next http.Handler) http.Handler {
+	return &vulnerableHandler{
+		next: next,
+	}
+}
+
+func (vh vulnerableHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	imgRaw := req.Context().Value(util.ImageInfoCtxKey)
+	if imgRaw == nil || !config.WithClair() {
+		vh.next.ServeHTTP(rw, req)
+		return
+	}
+	img, _ := req.Context().Value(util.ImageInfoCtxKey).(util.ImageInfo)
+	if img.Digest == "" {
+		vh.next.ServeHTTP(rw, req)
+		return
+	}
+	projectVulnerableEnabled, projectVulnerableSeverity := util.GetPolicyChecker().VulnerablePolicy(img.ProjectName)
+	if !projectVulnerableEnabled {
+		vh.next.ServeHTTP(rw, req)
+		return
+	}
+	overview, err := dao.GetImgScanOverview(img.Digest)
+	if err != nil {
+		log.Errorf("failed to get ImgScanOverview with repo: %s, reference: %s, digest: %s. Error: %v", img.Repository, img.Reference, img.Digest, err)
+		http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", "Failed to get ImgScanOverview."), http.StatusPreconditionFailed)
+		return
+	}
+	// severity is 0 means that the image fails to scan or not scanned successfully.
+	if overview == nil || overview.Sev == 0 {
+		http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", "Cannot get the image severity."), http.StatusPreconditionFailed)
+		return
+	}
+	imageSev := overview.Sev
+	if imageSev >= int(projectVulnerableSeverity) {
+		log.Debugf("the image severity: %q is higher then project setting: %q, failing the response.", models.Severity(imageSev), projectVulnerableSeverity)
+		http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("The severity of vulnerability of the image: %q is equal or higher than the threshold in project setting: %q.", models.Severity(imageSev), projectVulnerableSeverity)), http.StatusPreconditionFailed)
+		return
+	}
+	vh.next.ServeHTTP(rw, req)
+}
diff --git a/src/core/proxy/interceptor_test.go b/src/core/proxy/interceptor_test.go
deleted file mode 100644
index ab73f27bf..000000000
--- a/src/core/proxy/interceptor_test.go
+++ /dev/null
@@ -1,226 +0,0 @@
-package proxy
-
-import (
-	"github.com/goharbor/harbor/src/common"
-	"github.com/goharbor/harbor/src/common/models"
-	notarytest "github.com/goharbor/harbor/src/common/utils/notary/test"
-	testutils "github.com/goharbor/harbor/src/common/utils/test"
-	"github.com/goharbor/harbor/src/core/config"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"net/http"
-	"net/http/httptest"
-	"os"
-	"testing"
-)
-
-var endpoint = "10.117.4.142"
-var notaryServer *httptest.Server
-
-var admiralEndpoint = "http://127.0.0.1:8282"
-var token = ""
-
-func TestMain(m *testing.M) {
-	notaryServer = notarytest.NewNotaryServer(endpoint)
-	defer notaryServer.Close()
-	NotaryEndpoint = notaryServer.URL
-	var defaultConfig = map[string]interface{}{
-		common.ExtEndpoint:     "https://" + endpoint,
-		common.WithNotary:      true,
-		common.TokenExpiration: 30,
-	}
-	config.InitWithSettings(defaultConfig)
-	result := m.Run()
-	if result != 0 {
-		os.Exit(result)
-	}
-}
-
-func TestMatchPullManifest(t *testing.T) {
-	assert := assert.New(t)
-	req1, _ := http.NewRequest("POST", "http://127.0.0.1:5000/v2/library/ubuntu/manifests/14.04", nil)
-	res1, _, _ := MatchPullManifest(req1)
-	assert.False(res1, "%s %v is not a request to pull manifest", req1.Method, req1.URL)
-
-	req2, _ := http.NewRequest("GET", "http://192.168.0.3:80/v2/library/ubuntu/manifests/14.04", nil)
-	res2, repo2, tag2 := MatchPullManifest(req2)
-	assert.True(res2, "%s %v is a request to pull manifest", req2.Method, req2.URL)
-	assert.Equal("library/ubuntu", repo2)
-	assert.Equal("14.04", tag2)
-
-	req3, _ := http.NewRequest("GET", "https://192.168.0.5:443/v1/library/ubuntu/manifests/14.04", nil)
-	res3, _, _ := MatchPullManifest(req3)
-	assert.False(res3, "%s %v is not a request to pull manifest", req3.Method, req3.URL)
-
-	req4, _ := http.NewRequest("GET", "https://192.168.0.5/v2/library/ubuntu/manifests/14.04", nil)
-	res4, repo4, tag4 := MatchPullManifest(req4)
-	assert.True(res4, "%s %v is a request to pull manifest", req4.Method, req4.URL)
-	assert.Equal("library/ubuntu", repo4)
-	assert.Equal("14.04", tag4)
-
-	req5, _ := http.NewRequest("GET", "https://myregistry.com/v2/path1/path2/golang/manifests/1.6.2", nil)
-	res5, repo5, tag5 := MatchPullManifest(req5)
-	assert.True(res5, "%s %v is a request to pull manifest", req5.Method, req5.URL)
-	assert.Equal("path1/path2/golang", repo5)
-	assert.Equal("1.6.2", tag5)
-
-	req6, _ := http.NewRequest("GET", "https://myregistry.com/v2/myproject/registry/manifests/sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", nil)
-	res6, repo6, tag6 := MatchPullManifest(req6)
-	assert.True(res6, "%s %v is a request to pull manifest", req6.Method, req6.URL)
-	assert.Equal("myproject/registry", repo6)
-	assert.Equal("sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", tag6)
-
-	req7, _ := http.NewRequest("GET", "https://myregistry.com/v2/myproject/manifests/sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", nil)
-	res7, repo7, tag7 := MatchPullManifest(req7)
-	assert.True(res7, "%s %v is a request to pull manifest", req7.Method, req7.URL)
-	assert.Equal("myproject", repo7)
-	assert.Equal("sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", tag7)
-}
-
-func TestMatchPushManifest(t *testing.T) {
-	assert := assert.New(t)
-	req1, _ := http.NewRequest("POST", "http://127.0.0.1:5000/v2/library/ubuntu/manifests/14.04", nil)
-	res1, _, _ := MatchPushManifest(req1)
-	assert.False(res1, "%s %v is not a request to push manifest", req1.Method, req1.URL)
-
-	req2, _ := http.NewRequest("PUT", "http://192.168.0.3:80/v2/library/ubuntu/manifests/14.04", nil)
-	res2, repo2, tag2 := MatchPushManifest(req2)
-	assert.True(res2, "%s %v is a request to push manifest", req2.Method, req2.URL)
-	assert.Equal("library/ubuntu", repo2)
-	assert.Equal("14.04", tag2)
-
-	req3, _ := http.NewRequest("GET", "https://192.168.0.5:443/v1/library/ubuntu/manifests/14.04", nil)
-	res3, _, _ := MatchPushManifest(req3)
-	assert.False(res3, "%s %v is not a request to push manifest", req3.Method, req3.URL)
-
-	req4, _ := http.NewRequest("PUT", "https://192.168.0.5/v2/library/ubuntu/manifests/14.04", nil)
-	res4, repo4, tag4 := MatchPushManifest(req4)
-	assert.True(res4, "%s %v is a request to push manifest", req4.Method, req4.URL)
-	assert.Equal("library/ubuntu", repo4)
-	assert.Equal("14.04", tag4)
-
-	req5, _ := http.NewRequest("PUT", "https://myregistry.com/v2/path1/path2/golang/manifests/1.6.2", nil)
-	res5, repo5, tag5 := MatchPushManifest(req5)
-	assert.True(res5, "%s %v is a request to push manifest", req5.Method, req5.URL)
-	assert.Equal("path1/path2/golang", repo5)
-	assert.Equal("1.6.2", tag5)
-
-	req6, _ := http.NewRequest("PUT", "https://myregistry.com/v2/myproject/registry/manifests/sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", nil)
-	res6, repo6, tag6 := MatchPushManifest(req6)
-	assert.True(res6, "%s %v is a request to push manifest", req6.Method, req6.URL)
-	assert.Equal("myproject/registry", repo6)
-	assert.Equal("sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", tag6)
-
-	req7, _ := http.NewRequest("PUT", "https://myregistry.com/v2/myproject/manifests/sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", nil)
-	res7, repo7, tag7 := MatchPushManifest(req7)
-	assert.True(res7, "%s %v is a request to push manifest", req7.Method, req7.URL)
-	assert.Equal("myproject", repo7)
-	assert.Equal("sha256:ca4626b691f57d16ce1576231e4a2e2135554d32e13a85dcff380d51fdd13f6a", tag7)
-
-	req8, _ := http.NewRequest("PUT", "http://192.168.0.3:80/v2/library/ubuntu/manifests/14.04", nil)
-	res8, repo8, tag8 := MatchPushManifest(req8)
-	assert.True(res8, "%s %v is a request to push manifest", req8.Method, req8.URL)
-	assert.Equal("library/ubuntu", repo8)
-	assert.Equal("14.04", tag8)
-}
-
-func TestMatchListRepos(t *testing.T) {
-	assert := assert.New(t)
-	req1, _ := http.NewRequest("POST", "http://127.0.0.1:5000/v2/_catalog", nil)
-	res1 := MatchListRepos(req1)
-	assert.False(res1, "%s %v is not a request to list repos", req1.Method, req1.URL)
-
-	req2, _ := http.NewRequest("GET", "http://127.0.0.1:5000/v2/_catalog", nil)
-	res2 := MatchListRepos(req2)
-	assert.True(res2, "%s %v is a request to list repos", req2.Method, req2.URL)
-
-	req3, _ := http.NewRequest("GET", "https://192.168.0.5:443/v1/_catalog", nil)
-	res3 := MatchListRepos(req3)
-	assert.False(res3, "%s %v is not a request to pull manifest", req3.Method, req3.URL)
-
-}
-
-func TestPMSPolicyChecker(t *testing.T) {
-	var defaultConfigAdmiral = map[string]interface{}{
-		common.ExtEndpoint:        "https://" + endpoint,
-		common.WithNotary:         true,
-		common.TokenExpiration:    30,
-		common.DatabaseType:       "postgresql",
-		common.PostGreSQLHOST:     "127.0.0.1",
-		common.PostGreSQLPort:     5432,
-		common.PostGreSQLUsername: "postgres",
-		common.PostGreSQLPassword: "root123",
-		common.PostGreSQLDatabase: "registry",
-	}
-
-	if err := config.Init(); err != nil {
-		panic(err)
-	}
-	testutils.InitDatabaseFromEnv()
-
-	config.Upload(defaultConfigAdmiral)
-
-	name := "project_for_test_get_sev_low"
-	id, err := config.GlobalProjectMgr.Create(&models.Project{
-		Name:    name,
-		OwnerID: 1,
-		Metadata: map[string]string{
-			models.ProMetaEnableContentTrust: "true",
-			models.ProMetaPreventVul:         "true",
-			models.ProMetaSeverity:           "low",
-		},
-	})
-	require.Nil(t, err)
-	defer func(id int64) {
-		if err := config.GlobalProjectMgr.Delete(id); err != nil {
-			t.Logf("failed to delete project %d: %v", id, err)
-		}
-	}(id)
-
-	contentTrustFlag := getPolicyChecker().contentTrustEnabled("project_for_test_get_sev_low")
-	assert.True(t, contentTrustFlag)
-	projectVulnerableEnabled, projectVulnerableSeverity := getPolicyChecker().vulnerablePolicy("project_for_test_get_sev_low")
-	assert.True(t, projectVulnerableEnabled)
-	assert.Equal(t, projectVulnerableSeverity, models.SevLow)
-}
-
-func TestMatchNotaryDigest(t *testing.T) {
-	assert := assert.New(t)
-	// The data from common/utils/notary/helper_test.go
-	img1 := imageInfo{"notary-demo/busybox", "1.0", "notary-demo", "sha256:1359608115b94599e5641638bac5aef1ddfaa79bb96057ebf41ebc8d33acf8a7"}
-	img2 := imageInfo{"notary-demo/busybox", "2.0", "notary-demo", "sha256:12345678"}
-
-	res1, err := matchNotaryDigest(img1)
-	assert.Nil(err, "Unexpected error: %v, image: %#v", err, img1)
-	assert.True(res1)
-
-	res2, err := matchNotaryDigest(img2)
-	assert.Nil(err, "Unexpected error: %v, image: %#v, take 2", err, img2)
-	assert.False(res2)
-}
-
-func TestCopyResp(t *testing.T) {
-	assert := assert.New(t)
-	rec1 := httptest.NewRecorder()
-	rec2 := httptest.NewRecorder()
-	rec1.Header().Set("X-Test", "mytest")
-	rec1.WriteHeader(418)
-	copyResp(rec1, rec2)
-	assert.Equal(418, rec2.Result().StatusCode)
-	assert.Equal("mytest", rec2.Header().Get("X-Test"))
-}
-
-func TestMarshalError(t *testing.T) {
-	assert := assert.New(t)
-	js1 := marshalError("PROJECT_POLICY_VIOLATION", "Not Found")
-	assert.Equal("{\"errors\":[{\"code\":\"PROJECT_POLICY_VIOLATION\",\"message\":\"Not Found\",\"detail\":\"Not Found\"}]}", js1)
-	js2 := marshalError("DENIED", "The action is denied")
-	assert.Equal("{\"errors\":[{\"code\":\"DENIED\",\"message\":\"The action is denied\",\"detail\":\"The action is denied\"}]}", js2)
-}
-
-func TestIsDigest(t *testing.T) {
-	assert := assert.New(t)
-	assert.False(isDigest("latest"))
-	assert.True(isDigest("sha256:1359608115b94599e5641638bac5aef1ddfaa79bb96057ebf41ebc8d33acf8a7"))
-}
diff --git a/src/core/proxy/interceptors.go b/src/core/proxy/interceptors.go
deleted file mode 100644
index fb656edce..000000000
--- a/src/core/proxy/interceptors.go
+++ /dev/null
@@ -1,411 +0,0 @@
-package proxy
-
-import (
-	"encoding/json"
-	"github.com/goharbor/harbor/src/common/dao"
-	"github.com/goharbor/harbor/src/common/models"
-	"github.com/goharbor/harbor/src/common/utils/clair"
-	"github.com/goharbor/harbor/src/common/utils/log"
-	"github.com/goharbor/harbor/src/common/utils/notary"
-	"github.com/goharbor/harbor/src/core/config"
-	"github.com/goharbor/harbor/src/core/promgr"
-	coreutils "github.com/goharbor/harbor/src/core/utils"
-	"github.com/goharbor/harbor/src/pkg/scan"
-
-	"context"
-	"fmt"
-	"net/http"
-	"net/http/httptest"
-	"regexp"
-	"strconv"
-	"strings"
-)
-
-type contextKey string
-
-const (
-	manifestURLPattern = `^/v2/((?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)+)manifests/([\w][\w.:-]{0,127})`
-	catalogURLPattern  = `/v2/_catalog`
-	imageInfoCtxKey    = contextKey("ImageInfo")
-	// TODO: temp solution, remove after vmware/harbor#2242 is resolved.
-	tokenUsername = "harbor-core"
-)
-
-// Record the docker deamon raw response.
-var rec *httptest.ResponseRecorder
-
-// NotaryEndpoint , exported for testing.
-var NotaryEndpoint = ""
-
-// MatchPullManifest checks if the request looks like a request to pull manifest.  If it is returns the image and tag/sha256 digest as 2nd and 3rd return values
-func MatchPullManifest(req *http.Request) (bool, string, string) {
-	// TODO: add user agent check.
-	if req.Method != http.MethodGet {
-		return false, "", ""
-	}
-	return matchManifestURL(req)
-}
-
-// MatchPushManifest checks if the request looks like a request to push manifest.  If it is returns the image and tag/sha256 digest as 2nd and 3rd return values
-func MatchPushManifest(req *http.Request) (bool, string, string) {
-	if req.Method != http.MethodPut {
-		return false, "", ""
-	}
-	return matchManifestURL(req)
-}
-
-func matchManifestURL(req *http.Request) (bool, string, string) {
-	re := regexp.MustCompile(manifestURLPattern)
-	s := re.FindStringSubmatch(req.URL.Path)
-	if len(s) == 3 {
-		s[1] = strings.TrimSuffix(s[1], "/")
-		return true, s[1], s[2]
-	}
-	return false, "", ""
-}
-
-// MatchListRepos checks if the request looks like a request to list repositories.
-func MatchListRepos(req *http.Request) bool {
-	if req.Method != http.MethodGet {
-		return false
-	}
-	re := regexp.MustCompile(catalogURLPattern)
-	s := re.FindStringSubmatch(req.URL.Path)
-	if len(s) == 1 {
-		return true
-	}
-	return false
-}
-
-// policyChecker checks the policy of a project by project name, to determine if it's needed to check the image's status under this project.
-type policyChecker interface {
-	// contentTrustEnabled returns whether a project has enabled content trust.
-	contentTrustEnabled(name string) bool
-	// vulnerablePolicy  returns whether a project has enabled vulnerable, and the project's severity.
-	vulnerablePolicy(name string) (bool, models.Severity)
-}
-
-type pmsPolicyChecker struct {
-	pm promgr.ProjectManager
-}
-
-func (pc pmsPolicyChecker) contentTrustEnabled(name string) bool {
-	project, err := pc.pm.Get(name)
-	if err != nil {
-		log.Errorf("Unexpected error when getting the project, error: %v", err)
-		return true
-	}
-	return project.ContentTrustEnabled()
-}
-func (pc pmsPolicyChecker) vulnerablePolicy(name string) (bool, models.Severity) {
-	project, err := pc.pm.Get(name)
-	if err != nil {
-		log.Errorf("Unexpected error when getting the project, error: %v", err)
-		return true, models.SevUnknown
-	}
-	return project.VulPrevented(), clair.ParseClairSev(project.Severity())
-}
-
-// newPMSPolicyChecker returns an instance of an pmsPolicyChecker
-func newPMSPolicyChecker(pm promgr.ProjectManager) policyChecker {
-	return &pmsPolicyChecker{
-		pm: pm,
-	}
-}
-
-func getPolicyChecker() policyChecker {
-	return newPMSPolicyChecker(config.GlobalProjectMgr)
-}
-
-type imageInfo struct {
-	repository  string
-	reference   string
-	projectName string
-	digest      string
-}
-
-type urlHandler struct {
-	next http.Handler
-}
-
-func (uh urlHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	log.Debugf("in url handler, path: %s", req.URL.Path)
-	flag, repository, reference := MatchPullManifest(req)
-	if flag {
-		components := strings.SplitN(repository, "/", 2)
-		if len(components) < 2 {
-			http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("Bad repository name: %s", repository)), http.StatusBadRequest)
-			return
-		}
-
-		client, err := coreutils.NewRepositoryClientForUI(tokenUsername, repository)
-		if err != nil {
-			log.Errorf("Error creating repository Client: %v", err)
-			http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("Failed due to internal Error: %v", err)), http.StatusInternalServerError)
-			return
-		}
-		digest, _, err := client.ManifestExist(reference)
-		if err != nil {
-			log.Errorf("Failed to get digest for reference: %s, error: %v", reference, err)
-			http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("Failed due to internal Error: %v", err)), http.StatusInternalServerError)
-			return
-		}
-
-		img := imageInfo{
-			repository:  repository,
-			reference:   reference,
-			projectName: components[0],
-			digest:      digest,
-		}
-
-		log.Debugf("image info of the request: %#v", img)
-		ctx := context.WithValue(req.Context(), imageInfoCtxKey, img)
-		req = req.WithContext(ctx)
-	}
-	uh.next.ServeHTTP(rw, req)
-}
-
-type readonlyHandler struct {
-	next http.Handler
-}
-
-func (rh readonlyHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	if config.ReadOnly() {
-		if req.Method == http.MethodDelete || req.Method == http.MethodPost || req.Method == http.MethodPatch || req.Method == http.MethodPut {
-			log.Warningf("The request is prohibited in readonly mode, url is: %s", req.URL.Path)
-			http.Error(rw, marshalError("DENIED", "The system is in read only mode. Any modification is prohibited."), http.StatusForbidden)
-			return
-		}
-	}
-	rh.next.ServeHTTP(rw, req)
-}
-
-type multipleManifestHandler struct {
-	next http.Handler
-}
-
-// The handler is responsible for blocking request to upload manifest list by docker client, which is not supported so far by Harbor.
-func (mh multipleManifestHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	match, _, _ := MatchPushManifest(req)
-	if match {
-		contentType := req.Header.Get("Content-type")
-		// application/vnd.docker.distribution.manifest.list.v2+json
-		if strings.Contains(contentType, "manifest.list.v2") {
-			log.Debugf("Content-type: %s is not supported, failing the response.", contentType)
-			http.Error(rw, marshalError("UNSUPPORTED_MEDIA_TYPE", "Manifest.list is not supported."), http.StatusUnsupportedMediaType)
-			return
-		}
-	}
-	mh.next.ServeHTTP(rw, req)
-}
-
-type listReposHandler struct {
-	next http.Handler
-}
-
-func (lrh listReposHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	listReposFlag := MatchListRepos(req)
-	if listReposFlag {
-		rec = httptest.NewRecorder()
-		lrh.next.ServeHTTP(rec, req)
-		if rec.Result().StatusCode != http.StatusOK {
-			copyResp(rec, rw)
-			return
-		}
-		var ctlg struct {
-			Repositories []string `json:"repositories"`
-		}
-		decoder := json.NewDecoder(rec.Body)
-		if err := decoder.Decode(&ctlg); err != nil {
-			log.Errorf("Decode repositories error: %v", err)
-			copyResp(rec, rw)
-			return
-		}
-		var entries []string
-		for repo := range ctlg.Repositories {
-			log.Debugf("the repo in the response %s", ctlg.Repositories[repo])
-			exist := dao.RepositoryExists(ctlg.Repositories[repo])
-			if exist {
-				entries = append(entries, ctlg.Repositories[repo])
-			}
-		}
-		type Repos struct {
-			Repositories []string `json:"repositories"`
-		}
-		resp := &Repos{Repositories: entries}
-		respJSON, err := json.Marshal(resp)
-		if err != nil {
-			log.Errorf("Encode repositories error: %v", err)
-			copyResp(rec, rw)
-			return
-		}
-
-		for k, v := range rec.Header() {
-			rw.Header()[k] = v
-		}
-		clen := len(respJSON)
-		rw.Header().Set(http.CanonicalHeaderKey("Content-Length"), strconv.Itoa(clen))
-		rw.Write(respJSON)
-		return
-	}
-	lrh.next.ServeHTTP(rw, req)
-}
-
-type contentTrustHandler struct {
-	next http.Handler
-}
-
-func (cth contentTrustHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	imgRaw := req.Context().Value(imageInfoCtxKey)
-	if imgRaw == nil || !config.WithNotary() {
-		cth.next.ServeHTTP(rw, req)
-		return
-	}
-	img, _ := req.Context().Value(imageInfoCtxKey).(imageInfo)
-	if img.digest == "" {
-		cth.next.ServeHTTP(rw, req)
-		return
-	}
-	if !getPolicyChecker().contentTrustEnabled(img.projectName) {
-		cth.next.ServeHTTP(rw, req)
-		return
-	}
-	match, err := matchNotaryDigest(img)
-	if err != nil {
-		http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", "Failed in communication with Notary please check the log"), http.StatusInternalServerError)
-		return
-	}
-	if !match {
-		log.Debugf("digest mismatch, failing the response.")
-		http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", "The image is not signed in Notary."), http.StatusPreconditionFailed)
-		return
-	}
-	cth.next.ServeHTTP(rw, req)
-}
-
-type vulnerableHandler struct {
-	next http.Handler
-}
-
-func (vh vulnerableHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
-	imgRaw := req.Context().Value(imageInfoCtxKey)
-	if imgRaw == nil || !config.WithClair() {
-		vh.next.ServeHTTP(rw, req)
-		return
-	}
-	img, _ := req.Context().Value(imageInfoCtxKey).(imageInfo)
-	if img.digest == "" {
-		vh.next.ServeHTTP(rw, req)
-		return
-	}
-	projectVulnerableEnabled, projectVulnerableSeverity := getPolicyChecker().vulnerablePolicy(img.projectName)
-	if !projectVulnerableEnabled {
-		vh.next.ServeHTTP(rw, req)
-		return
-	}
-	// TODO: Get whitelist based on project setting
-	wl, err := dao.GetSysCVEWhitelist()
-	if err != nil {
-		log.Errorf("Failed to get the whitelist, error: %v", err)
-		http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", "Failed to get CVE whitelist."), http.StatusPreconditionFailed)
-		return
-	}
-	vl, err := scan.VulnListByDigest(img.digest)
-	if err != nil {
-		log.Errorf("Failed to get the vulnerability list, error: %v", err)
-		http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", "Failed to get vulnerabilities."), http.StatusPreconditionFailed)
-		return
-	}
-	filtered := vl.ApplyWhitelist(*wl)
-	msg := vh.filterMsg(img, filtered)
-	log.Info(msg)
-	if int(vl.Severity()) >= int(projectVulnerableSeverity) {
-		log.Debugf("the image severity: %q is higher then project setting: %q, failing the response.", vl.Severity(), projectVulnerableSeverity)
-		http.Error(rw, marshalError("PROJECT_POLICY_VIOLATION", fmt.Sprintf("The severity of vulnerability of the image: %q is equal or higher than the threshold in project setting: %q.", vl.Severity(), projectVulnerableSeverity)), http.StatusPreconditionFailed)
-		return
-	}
-	vh.next.ServeHTTP(rw, req)
-}
-
-func (vh vulnerableHandler) filterMsg(img imageInfo, filtered scan.VulnerabilityList) string {
-	filterMsg := fmt.Sprintf("Image: %s/%s:%s, digest: %s, vulnerabilities fitered by whitelist:", img.projectName, img.repository, img.reference, img.digest)
-	if len(filtered) == 0 {
-		filterMsg = fmt.Sprintf("%s none.", filterMsg)
-	}
-	for _, v := range filtered {
-		filterMsg = fmt.Sprintf("%s ID: %s, severity: %s;", filterMsg, v.ID, v.Severity)
-	}
-	return filterMsg
-}
-
-func matchNotaryDigest(img imageInfo) (bool, error) {
-	if NotaryEndpoint == "" {
-		NotaryEndpoint = config.InternalNotaryEndpoint()
-	}
-	targets, err := notary.GetInternalTargets(NotaryEndpoint, tokenUsername, img.repository)
-	if err != nil {
-		return false, err
-	}
-	for _, t := range targets {
-		if isDigest(img.reference) {
-			d, err := notary.DigestFromTarget(t)
-			if err != nil {
-				return false, err
-			}
-			if img.digest == d {
-				return true, nil
-			}
-		} else {
-			if t.Tag == img.reference {
-				log.Debugf("found reference: %s in notary, try to match digest.", img.reference)
-				d, err := notary.DigestFromTarget(t)
-				if err != nil {
-					return false, err
-				}
-				if img.digest == d {
-					return true, nil
-				}
-			}
-		}
-	}
-	log.Debugf("image: %#v, not found in notary", img)
-	return false, nil
-}
-
-// A sha256 is a string with 64 characters.
-func isDigest(ref string) bool {
-	return strings.HasPrefix(ref, "sha256:") && len(ref) == 71
-}
-
-func copyResp(rec *httptest.ResponseRecorder, rw http.ResponseWriter) {
-	for k, v := range rec.Header() {
-		rw.Header()[k] = v
-	}
-	rw.WriteHeader(rec.Result().StatusCode)
-	rw.Write(rec.Body.Bytes())
-}
-
-func marshalError(code, msg string) string {
-	var tmpErrs struct {
-		Errors []JSONError `json:"errors,omitempty"`
-	}
-	tmpErrs.Errors = append(tmpErrs.Errors, JSONError{
-		Code:    code,
-		Message: msg,
-		Detail:  msg,
-	})
-
-	str, err := json.Marshal(tmpErrs)
-	if err != nil {
-		log.Debugf("failed to marshal json error, %v", err)
-		return msg
-	}
-	return string(str)
-}
-
-// JSONError wraps a concrete Code and Message, it's readable for docker deamon.
-type JSONError struct {
-	Code    string `json:"code,omitempty"`
-	Message string `json:"message,omitempty"`
-	Detail  string `json:"detail,omitempty"`
-}
diff --git a/src/core/proxy/proxy.go b/src/core/proxy/proxy.go
deleted file mode 100644
index bc0d7f44a..000000000
--- a/src/core/proxy/proxy.go
+++ /dev/null
@@ -1,56 +0,0 @@
-package proxy
-
-import (
-	"github.com/goharbor/harbor/src/core/config"
-
-	"fmt"
-	"net/http"
-	"net/http/httputil"
-	"net/url"
-)
-
-// Proxy is the instance of the reverse proxy in this package.
-var Proxy *httputil.ReverseProxy
-
-var handlers handlerChain
-
-type handlerChain struct {
-	head http.Handler
-}
-
-// Init initialize the Proxy instance and handler chain.
-func Init(urls ...string) error {
-	var err error
-	var registryURL string
-	if len(urls) > 1 {
-		return fmt.Errorf("the parm, urls should have only 0 or 1 elements")
-	}
-	if len(urls) == 0 {
-		registryURL, err = config.RegistryURL()
-		if err != nil {
-			return err
-		}
-	} else {
-		registryURL = urls[0]
-	}
-	targetURL, err := url.Parse(registryURL)
-	if err != nil {
-		return err
-	}
-	Proxy = httputil.NewSingleHostReverseProxy(targetURL)
-	handlers = handlerChain{
-		head: readonlyHandler{
-			next: urlHandler{
-				next: multipleManifestHandler{
-					next: listReposHandler{
-						next: contentTrustHandler{
-							next: vulnerableHandler{
-								next: Proxy,
-							}}}}}}}
-	return nil
-}
-
-// Handle handles the request.
-func Handle(rw http.ResponseWriter, req *http.Request) {
-	handlers.head.ServeHTTP(rw, req)
-}
diff --git a/src/go.mod b/src/go.mod
index 3ce265cce..9c6b4efcb 100644
--- a/src/go.mod
+++ b/src/go.mod
@@ -46,6 +46,7 @@ require (
 	github.com/gorilla/mux v1.6.2
 	github.com/hailocab/go-hostpool v0.0.0-20160125115350-e80d13ce29ed // indirect
 	github.com/jinzhu/gorm v1.9.8 // indirect
+	github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da
 	github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/lib/pq v1.1.0
diff --git a/src/go.sum b/src/go.sum
index 222c78148..c63861893 100644
--- a/src/go.sum
+++ b/src/go.sum
@@ -169,6 +169,8 @@ github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1
 github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
+github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da h1:5y58+OCjoHCYB8182mpf/dEsq0vwTKPOo4zGfH0xW9A=
+github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da/go.mod h1:oLH0CmIaxCGXD67VKGR5AacGXZSMznlmeqM8RzPrcY8=
 github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 h1:iQTw/8FWTuc7uiaSepXwyf3o52HaUYcV+Tu66S3F5GA=
 github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0/go.mod h1:1NbS8ALrpOvjt0rHPNLyCIeMtbizbir8U//inJ+zuB8=
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
diff --git a/src/vendor/github.com/justinas/alice/.travis.yml b/src/vendor/github.com/justinas/alice/.travis.yml
new file mode 100644
index 000000000..dc6bea671
--- /dev/null
+++ b/src/vendor/github.com/justinas/alice/.travis.yml
@@ -0,0 +1,17 @@
+language: go
+
+matrix:
+  include:
+    - go: 1.0.x
+    - go: 1.1.x
+    - go: 1.2.x
+    - go: 1.3.x
+    - go: 1.4.x
+    - go: 1.5.x
+    - go: 1.6.x
+    - go: 1.7.x
+    - go: 1.8.x
+    - go: 1.9.x
+    - go: tip
+  allow_failures:
+    - go: tip
diff --git a/src/vendor/github.com/justinas/alice/LICENSE b/src/vendor/github.com/justinas/alice/LICENSE
new file mode 100644
index 000000000..0d0d352ec
--- /dev/null
+++ b/src/vendor/github.com/justinas/alice/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Justinas Stankevicius
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/src/vendor/github.com/justinas/alice/README.md b/src/vendor/github.com/justinas/alice/README.md
new file mode 100644
index 000000000..e4f9157c0
--- /dev/null
+++ b/src/vendor/github.com/justinas/alice/README.md
@@ -0,0 +1,98 @@
+# Alice 
+
+[![GoDoc](https://godoc.org/github.com/golang/gddo?status.svg)](http://godoc.org/github.com/justinas/alice)
+[![Build Status](https://travis-ci.org/justinas/alice.svg?branch=master)](https://travis-ci.org/justinas/alice)
+[![Coverage](http://gocover.io/_badge/github.com/justinas/alice)](http://gocover.io/github.com/justinas/alice)
+
+Alice provides a convenient way to chain 
+your HTTP middleware functions and the app handler.
+
+In short, it transforms
+
+```go
+Middleware1(Middleware2(Middleware3(App)))
+```
+
+to
+
+```go
+alice.New(Middleware1, Middleware2, Middleware3).Then(App)
+```
+
+### Why?
+
+None of the other middleware chaining solutions
+behaves exactly like Alice.
+Alice is as minimal as it gets:
+in essence, it's just a for loop that does the wrapping for you.
+
+Check out [this blog post](http://justinas.org/alice-painless-middleware-chaining-for-go/)
+for explanation how Alice is different from other chaining solutions.
+
+### Usage
+
+Your middleware constructors should have the form of
+
+```go
+func (http.Handler) http.Handler
+```
+
+Some middleware provide this out of the box.
+For ones that don't, it's trivial to write one yourself.
+
+```go
+func myStripPrefix(h http.Handler) http.Handler {
+    return http.StripPrefix("/old", h)
+}
+```
+
+This complete example shows the full power of Alice.
+
+```go
+package main
+
+import (
+    "net/http"
+    "time"
+
+    "github.com/throttled/throttled"
+    "github.com/justinas/alice"
+    "github.com/justinas/nosurf"
+)
+
+func timeoutHandler(h http.Handler) http.Handler {
+    return http.TimeoutHandler(h, 1*time.Second, "timed out")
+}
+
+func myApp(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte("Hello world!"))
+}
+
+func main() {
+    th := throttled.Interval(throttled.PerSec(10), 1, &throttled.VaryBy{Path: true}, 50)
+    myHandler := http.HandlerFunc(myApp)
+
+    chain := alice.New(th.Throttle, timeoutHandler, nosurf.NewPure).Then(myHandler)
+    http.ListenAndServe(":8000", chain)
+}
+```
+
+Here, the request will pass [throttled](https://github.com/PuerkitoBio/throttled) first,
+then an http.TimeoutHandler we've set up,
+then [nosurf](https://github.com/justinas/nosurf)
+and will finally reach our handler.
+
+Note that Alice makes **no guarantees** for
+how one or another piece of  middleware will behave.
+Once it passes the execution to the outer layer of middleware,
+it has no saying in whether middleware will execute the inner handlers.
+This is intentional behavior.
+
+Alice works with Go 1.0 and higher.
+
+### Contributing
+
+0. Find an issue that bugs you / open a new one.
+1. Discuss.
+2. Branch off, commit, test.
+3. Make a pull request / attach the commits to the issue.
diff --git a/src/vendor/github.com/justinas/alice/chain.go b/src/vendor/github.com/justinas/alice/chain.go
new file mode 100644
index 000000000..da0e2b580
--- /dev/null
+++ b/src/vendor/github.com/justinas/alice/chain.go
@@ -0,0 +1,112 @@
+// Package alice provides a convenient way to chain http handlers.
+package alice
+
+import "net/http"
+
+// A constructor for a piece of middleware.
+// Some middleware use this constructor out of the box,
+// so in most cases you can just pass somepackage.New
+type Constructor func(http.Handler) http.Handler
+
+// Chain acts as a list of http.Handler constructors.
+// Chain is effectively immutable:
+// once created, it will always hold
+// the same set of constructors in the same order.
+type Chain struct {
+	constructors []Constructor
+}
+
+// New creates a new chain,
+// memorizing the given list of middleware constructors.
+// New serves no other function,
+// constructors are only called upon a call to Then().
+func New(constructors ...Constructor) Chain {
+	return Chain{append(([]Constructor)(nil), constructors...)}
+}
+
+// Then chains the middleware and returns the final http.Handler.
+//     New(m1, m2, m3).Then(h)
+// is equivalent to:
+//     m1(m2(m3(h)))
+// When the request comes in, it will be passed to m1, then m2, then m3
+// and finally, the given handler
+// (assuming every middleware calls the following one).
+//
+// A chain can be safely reused by calling Then() several times.
+//     stdStack := alice.New(ratelimitHandler, csrfHandler)
+//     indexPipe = stdStack.Then(indexHandler)
+//     authPipe = stdStack.Then(authHandler)
+// Note that constructors are called on every call to Then()
+// and thus several instances of the same middleware will be created
+// when a chain is reused in this way.
+// For proper middleware, this should cause no problems.
+//
+// Then() treats nil as http.DefaultServeMux.
+func (c Chain) Then(h http.Handler) http.Handler {
+	if h == nil {
+		h = http.DefaultServeMux
+	}
+
+	for i := range c.constructors {
+		h = c.constructors[len(c.constructors)-1-i](h)
+	}
+
+	return h
+}
+
+// ThenFunc works identically to Then, but takes
+// a HandlerFunc instead of a Handler.
+//
+// The following two statements are equivalent:
+//     c.Then(http.HandlerFunc(fn))
+//     c.ThenFunc(fn)
+//
+// ThenFunc provides all the guarantees of Then.
+func (c Chain) ThenFunc(fn http.HandlerFunc) http.Handler {
+	if fn == nil {
+		return c.Then(nil)
+	}
+	return c.Then(fn)
+}
+
+// Append extends a chain, adding the specified constructors
+// as the last ones in the request flow.
+//
+// Append returns a new chain, leaving the original one untouched.
+//
+//     stdChain := alice.New(m1, m2)
+//     extChain := stdChain.Append(m3, m4)
+//     // requests in stdChain go m1 -> m2
+//     // requests in extChain go m1 -> m2 -> m3 -> m4
+func (c Chain) Append(constructors ...Constructor) Chain {
+	newCons := make([]Constructor, 0, len(c.constructors)+len(constructors))
+	newCons = append(newCons, c.constructors...)
+	newCons = append(newCons, constructors...)
+
+	return Chain{newCons}
+}
+
+// Extend extends a chain by adding the specified chain
+// as the last one in the request flow.
+//
+// Extend returns a new chain, leaving the original one untouched.
+//
+//     stdChain := alice.New(m1, m2)
+//     ext1Chain := alice.New(m3, m4)
+//     ext2Chain := stdChain.Extend(ext1Chain)
+//     // requests in stdChain go  m1 -> m2
+//     // requests in ext1Chain go m3 -> m4
+//     // requests in ext2Chain go m1 -> m2 -> m3 -> m4
+//
+// Another example:
+//  aHtmlAfterNosurf := alice.New(m2)
+// 	aHtml := alice.New(m1, func(h http.Handler) http.Handler {
+// 		csrf := nosurf.New(h)
+// 		csrf.SetFailureHandler(aHtmlAfterNosurf.ThenFunc(csrfFail))
+// 		return csrf
+// 	}).Extend(aHtmlAfterNosurf)
+//		// requests to aHtml hitting nosurfs success handler go m1 -> nosurf -> m2 -> target-handler
+//		// requests to aHtml hitting nosurfs failure handler go m1 -> nosurf -> m2 -> csrfFail
+func (c Chain) Extend(chain Chain) Chain {
+	return c.Append(chain.constructors...)
+}
diff --git a/src/vendor/modules.txt b/src/vendor/modules.txt
index fbe305814..fc7a8ec94 100644
--- a/src/vendor/modules.txt
+++ b/src/vendor/modules.txt
@@ -114,6 +114,8 @@ github.com/gorilla/handlers
 github.com/gorilla/mux
 # github.com/json-iterator/go v1.1.6
 github.com/json-iterator/go
+# github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da
+github.com/justinas/alice
 # github.com/konsorten/go-windows-terminal-sequences v1.0.2
 github.com/konsorten/go-windows-terminal-sequences
 # github.com/lib/pq v1.1.0