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Add etag handling and cache-control headers to webserver - closes #17

This commit is contained in:
Blue (Lukas Rieger) 2020-01-18 13:43:32 +01:00
parent a75f238222
commit 2bc1f2dace
1 changed files with 14 additions and 1 deletions
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15
BlueMapCore/src/main/java/de/bluecolored/bluemap/core/web/BlueMapWebRequestHandler.java
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@ -38,6 +38,7 @@ import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
@ -160,9 +161,21 @@ public class BlueMapWebRequestHandler implements HttpRequestHandler {
} catch (IllegalArgumentException e){}
}
//check ETag
String eTag = Long.toHexString(file.length()) + Integer.toHexString(file.hashCode()) + Long.toHexString(lastModified);
Set<String> etagStringSet = request.getHeader("If-None-Match");
if (!etagStringSet.isEmpty()){
if(etagStringSet.iterator().next().equals(eTag)) {
return new HttpResponse(HttpStatusCode.NOT_MODIFIED);
}
}
//create response
HttpResponse response = new HttpResponse(HttpStatusCode.OK);
response.addHeader("ETag", eTag);
if (lastModified > 0) response.addHeader("Last-Modified", timestampToString(lastModified));
response.addHeader("Cache-Control", "public");
response.addHeader("Cache-Control", "max-age=" + TimeUnit.HOURS.toSeconds(1));
//add content type header
String filetype = file.getName().toString();