esphome-docs/components/http_request.rst
H. Árkosi Róbert 7bfbc6f228
Example to parse values from JSON response to HTTP Request (#1914)
* Example to parse values from JSON response to HTTP Request

* Make the example less generic

Thanks @jesserockz 
https://discord.com/channels/429907082951524364/943548559289122837/943611047728799785

* Update http_request.rst

* Update http_request.rst

* Update http_request.rst
2022-03-12 13:27:48 -05:00

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HTTP Request
============
.. seo::
:description: Instructions for setting up HTTP Requests in ESPHome
:image: connection.svg
:keywords: http, request
The ``http_request`` component lets you make HTTP/HTTPS requests. First, you need to setup a component:
.. code-block:: yaml
# Example configuration entry
http_request:
useragent: esphome/device
timeout: 10s
Configuration variables:
------------------------
- **useragent** (*Optional*, string): User-Agent header for requests. Defaults to ``ESPHome``.
- **timeout** (*Optional*, :ref:`config-time`): Timeout for request. Defaults to ``5s``.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
- **follow_redirects** (*Optional*, boolean): Enable following HTTP redirects. Defaults to ``true``.
- **redirect_limit** (*Optional*, integer): Maximum amount of redirects to follow when enabled. Defaults to ``3``.
ESP8266 Options:
- **esp8266_disable_ssl_support** (*Optional*, boolean): Whether to include SSL support on ESP8266s.
Defaults to ``no``. See :ref:`esphome-esp8266_disable_ssl_support` for more info
.. _esphome-esp8266_disable_ssl_support:
``esp8266_disable_ssl_support``
-------------------------------
This options allows you to disable inclusion of SSL libraries. This is required on a flash
constrained devices (512k or 1M) which does not have enough space to support
SSL and OTA concurrently. The flashing will fail with the following error
``Error: ESP does not have enough space to store OTA file``.
HTTP Request Actions
--------------------
Component support a number of :ref:`actions <config-action>` that can be used to send requests.
.. _http_request-get_action:
``http_request.get`` Action
***************************
This :ref:`action <config-action>` sends a GET request.
.. code-block:: yaml
on_...:
- http_request.get:
url: https://esphome.io
headers:
Content-Type: application/json
verify_ssl: false
on_response:
then:
- logger.log:
format: 'Response status: %d'
args:
- status_code
# Short form
- http_request.get: https://esphome.io
Configuration variables:
- **url** (**Required**, string, :ref:`templatable <config-templatable>`): URL to send request.
- **headers** (*Optional*, mapping): Map of HTTP headers. Values are :ref:`templatable <config-templatable>`.
- **verify_ssl** (*Optional*, boolean): Verify the SSL certificate of the endpoint. Defaults to ``true``.
- **on_response** (*Optional*, :ref:`Automation <automation>`): An automation to perform when the request is finished.
.. note::
Currently ESPHome **can't verify the SSL certificate** of the endpoint.
Set ``verify_ssl: false`` to make HTTPS request.
.. _http_request-post_action:
``http_request.post`` Action
****************************
This :ref:`action <config-action>` sends a POST request.
.. code-block:: yaml
on_...:
- http_request.post:
url: https://esphome.io
headers:
Content-Type: application/json
json:
key: value
verify_ssl: false
# Short form
- http_request.post: https://esphome.io
Configuration variables:
- **body** (*Optional*, string, :ref:`templatable <config-templatable>`): A HTTP body string to send with request.
- **json** (*Optional*, mapping): A HTTP body in JSON format. Values are :ref:`templatable <config-templatable>`. See :ref:`http_request-examples`.
- All other options from :ref:`http_request-get_action`.
.. _http_request-send_action:
``http_request.send`` Action
****************************
This :ref:`action <config-action>` sends a request.
.. code-block:: yaml
on_...:
- http_request.send:
method: PUT
url: https://esphome.io
headers:
Content-Type: application/json
body: "Some data"
verify_ssl: false
Configuration variables:
- **method** (**Required**, string): HTTP method to use (``GET``, ``POST``, ``PUT``, ``DELETE``, ``PATCH``).
- All other options from :ref:`http_request-post_action`.
.. _http_request-on_response:
``on_response`` Trigger
-----------------------
This automation will be triggered when the HTTP request is finished and will supply the
http response code in parameter ``status_code`` as an ``int``.
.. code-block:: yaml
on_...
then:
- http_request.get:
url: https://esphome.io
verify_ssl: false
on_response:
then:
- logger.log:
format: "Response status: %d"
args:
- status_code
.. _http_request-examples:
Examples
--------
Templatable values
******************
.. code-block:: yaml
on_...:
- http_request.post:
url: !lambda |-
return ((std::string) "https://esphome.io?state=" + id(my_sensor).state).c_str();
headers:
X-Custom-Header: !lambda |-
return ((std::string) "Value-" + id(my_sensor).state).c_str();
body: !lambda |-
return id(my_sensor).state;
POST Body in JSON format (syntax 1)
***********************************
**Note:** all values of the map should be a strings.
It's impossible to send ``boolean`` or ``numbers`` with this syntax.
.. code-block:: yaml
on_...:
- http_request.post:
url: https://esphome.io
verify_ssl: false
json:
key: !lambda |-
return id(my_sensor).state;
greeting: "Hello World"
# Will send:
# {"key": "42.0", "greeting": "Hello World"}
POST Body in JSON format (syntax 2)
***********************************
**Note:** use this syntax to send ``boolean`` or ``numbers`` in JSON.
The JSON message will be constructed using the `ArduinoJson <https://github.com/bblanchon/ArduinoJson>`__ library.
In the ``json`` option you have access to a ``root`` object which will represents the base object
of the JSON message. You can assign values to keys by using the ``root["KEY_NAME"] = VALUE;`` syntax
as seen below.
.. code-block:: yaml
on_...:
- http_request.post:
url: https://esphome.io
verify_ssl: false
json: |-
root["key"] = id(my_sensor).state;
root["greeting"] = "Hello World";
# Will send:
# {"key": 42.0, "greeting": "Hello World"}
GET values from a JSON body response
************************************
Assuming that the server returns a response in a JSON object over HTTP similar to this:
``{"status":"play","vol":"42","mute":"0"}``
If you want to retrieve the value for the ``vol`` key and assign it to a template ``sensor`` or ``number`` component (with ``id`` set to ``player_volume``):
.. code-block:: yaml
on_...:
- http_request.get:
url: https://esphome.io
on_response:
then:
- lambda: |-
json::parse_json(id(http_request_data).get_string(), [](JsonObject root) {
id(player_volume).publish_state(root["vol"]);
});
**Note:** don't forget to set the ``id`` for the main ``http_request`` component, to ``http_request_data``.
See Also
--------
- :doc:`index`
- :apiref:`http_request/http_request.h`
- :ghedit:`Edit`