add **connection_pool_kw to Request() constructor

AUTHORS.rst

@@ -77,6 +77,7 @@ The following wonderful people contributed directly or indirectly to this projec
 - `naveenvhegde <https://github.com/naveenvhegde>`_
 - `neurrone <https://github.com/neurrone>`_
 - `NikitaPirate <https://github.com/NikitaPirate>`_
+- `Niklas Rosenstein <https://github.com/NiklasRosenstein>`_
 - `Nikolai Krivenko <https://github.com/nkrivenko>`_
 - `njittam <https://github.com/njittam>`_
 - `Noam Meltzer <https://github.com/tsnoam>`_

telegram/utils/request.py

@@ -109,7 +109,9 @@ class Request:
             between consecutive read operations for a response from the server. :obj:`None` will
             set an infinite timeout. This value is usually overridden by the various
             :class:`telegram.Bot` methods. Defaults to ``5.0``.
+        connection_pool_kw: Additional keyword arguments to pass to the underlying connection pool.
 
+            .. versionadded:: 13.6.1
     """
 
     __slots__ = ('_connect_timeout', '_con_pool_size', '_con_pool', '__dict__')
@@ -121,10 +123,14 @@ def __init__(
         urllib3_proxy_kwargs: JSONDict = None,
         connect_timeout: float = 5.0,
         read_timeout: float = 5.0,
+        connection_pool_kw: JSONDict = None,
     ):
         if urllib3_proxy_kwargs is None:
             urllib3_proxy_kwargs = {}
 
+        if connection_pool_kw is None:
+            connection_pool_kw = {}
+
         self._connect_timeout = connect_timeout
 
         sockopts = HTTPConnection.default_socket_options + [
@@ -152,6 +158,7 @@ def __init__(
             socket_options=sockopts,
             timeout=urllib3.Timeout(connect=self._connect_timeout, read=read_timeout, total=None),
         )
+        kwargs.update(connection_pool_kw)
 
         # Set a proxy according to the following order:
         # * proxy defined in proxy_url (+ urllib3_proxy_kwargs)