Commits on Jul 12, 2022

1. Add TCP_KEEPALIVE option to http provider …

   Enabling TCP_KEEPALIVE allows to keep the idle connections opened
   when there are firewalls in-betweeen that close such connections.
   
   TCP_KEEPALIVE sends a "no-data" packet regularly (and expects
   ACK from the server). This should not be mistaken with Python
   requests "keep alive" feature - which reuses opened HTTP connections
   if you perform several requests to the same server (both are named
   keep alive but they both mean two completely different things and
   are implemented at differen layers of the OSI network stack. The
   Requests Keep Alive is Layer 7 (application) and TCP Keep Alive
   is at Layer 4 (transport).
   
   The "Requests" keep alive is enabled by default in the requests
   library while the TCP Keep Alive requires a TCPKeepAliveAdapter
   to be used (from requests_toolbelt library).
   
   Fixes: apache#21365

   

   potiuk committed Jul 12, 2022
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