minor #12043 [HttpClient] Add buffer configuration option to http_client (rjwebdev)

This PR was merged into the 4.4 branch.

Discussion
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[HttpClient] Add buffer configuration option to http_client

In PR symfony/symfony#32565, a regex value was added as a check to automatically buffer the content of a call. Since this is a new feature, the documentation of the http_client configuration true frameworkbundle is updated
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Commits
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0f65736 Add buffer configuration option to http_client

Author: javiereguiluz

reference/configuration/framework.rst

@@ -93,6 +93,7 @@ Configuration
   * :ref:`default_options <reference-http-client-default-options>`
 
     * `bindto`_
+    * `buffer`_
     * `cafile`_
     * `capath`_
     * `ciphers`_
@@ -120,6 +121,7 @@ Configuration
     * `auth_ntlm`_
     * `base_uri`_
     * `bindto`_
+    * `buffer`_
     * `cafile`_
     * `capath`_
     * `ciphers`_
@@ -798,6 +800,16 @@ bindto
 A network interface name, IP address, a host name or a UNIX socket to use as the
 outgoing network interface.
 
+buffer
+......
+
+**type**: ``bool`` | ``string``
+
+Option that allows to buffer the content of the response and access it multiple times without performing the request again. 
+If boolean value given, request will be buffered or not according to the boolean value. If a string is given, this should 
+be a regex matching the response content-types that
+should be buffered
+
 cafile
 ......