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

components/http_request.rst

@@ -174,8 +174,8 @@ Templatable values
             return id(my_sensor).state;
 
 
-Body in JSON format (syntax 1)
-******************************
+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.
@@ -194,8 +194,8 @@ It's impossible to send ``boolean`` or ``numbers`` with this syntax.
         # Will send:
         # {"key": "42.0", "greeting": "Hello World"}
 
-Body in JSON format (syntax 2)
-******************************
+POST Body in JSON format (syntax 2)
+***********************************
 
 **Note:** use this syntax to send ``boolean`` or ``numbers`` in JSON.
 
@@ -217,6 +217,29 @@ as seen below.
         # 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
 --------