Merge branch '4.4' into 5.0

* 4.4:
  Clarified the three main types of exceptions thrown in HttpClient

Author: javiereguiluz

components/http_client.rst

@@ -420,7 +420,8 @@ Handling Exceptions
 
 When the HTTP status code of the response is in the 300-599 range (i.e. 3xx,
 4xx or 5xx) your code is expected to handle it. If you don't do that, the
-``getHeaders()`` and ``getContent()`` methods throw an appropriate exception::
+``getHeaders()`` and ``getContent()`` methods throw an appropriate exception, all of
+which implement the :class:`Symfony\\Contracts\\HttpClient\\Exception\\HttpExceptionInterface`::
 
     // the response of this request will be a 403 HTTP error
     $response = $client->request('GET', 'https://httpbin.org/status/403');
@@ -461,6 +462,17 @@ errors, exceptions will notify you when needed. On the other hand, if you write
 the error-handling code, you will opt-out from these fallback mechanisms as the
 destructor won't have anything remaining to do.
 
+There are three types of exceptions:
+
+* Exceptions implementing the :class:`Symfony\\Contracts\\HttpClient\\Exception\\HttpExceptionInterface`
+  are thrown when your code does not handle the status codes in the 300-599 range.
+
+* Exceptions implementing the :class:`Symfony\\Contracts\\HttpClient\\Exception\\TransportExceptionInterface`
+  are thrown when a lower level issue occurs.
+
+* Exceptions implementing the :class:`Symfony\\Contracts\\HttpClient\\Exception\\DecodingExceptionInterface`
+  are thrown when a content-type cannot be decoded to the expected representation.
+
 Concurrent Requests
 -------------------