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12742. By Alex Rousskov on 2017-05-22

Do not unconditionally revive dead peers after a DNS refresh.

A simpler version of v5 r15145 (and bag14 r14071).

12741. By Alex Rousskov on 2017-05-05

Do not forward HTTP requests to dead idle peers.

Same as v5 r15133.

12740. By Alex Rousskov on 2017-03-10

Bug 4065: round-robin neighbor selection with unequal weights

Same as trunk r13416.

12739. By Alex Rousskov on 2017-03-10

Count failures and use peer-specific connect timeouts when tunneling.

Fixed two bugs with tunneling CONNECT requests (or equivalent traffic)
through a cache_peer:

1. Not detecting dead cache_peers due to missing code to count peer
   connect failures. SSL-level failures were detected (for "ssl"
   cache_peers) but TCP/IP connect(2) failures were not (for all peers).

2. Origin server connect_timeout used instead of peer_connect_timeout or
   a peer-specific connect-timeout=N (where configured).

The regular forwarding code path does not have the above bugs. This
change reduces code duplication across the two code paths (that
duplication probably caused these bugs in the first place), but a lot
more work is needed in that direction.

This patch includes trunk r12754 port to bag5 r12737. Among other
polishing changes, this revision implements TunnelStateData constructor,
required in the current patch.

The 5-second forwarding timeout hack has been in Squid since
forward_timeout inception (r6733). It is not without problems (now
marked with an XXX), but I left it as is to avoid opening another
Pandora box. The hack now applies to the tunneling code path as well.

12738. By Alex Rousskov on 2017-03-01

Retry CONNECT tunneling attempt after connect_timeout.

When a peer hits connect_timeout, retry a different IP address (or a
different peer) instead of aborting with a client error. Limit these
retries by forward_timeout.

This patch ports trunk r14119 to bag5 r12737. The official fix
commit message implied that the fix is limited to retrying with a
different IP family, but that was wrong/misleading.

TODO: The tunneling code should use peer_connect_timeout instead of
connect_timeout, honor peer-specific connect-timeout (if any), and
count peer failures. Those problems are present in v5 code as well.

12737. By Alex Rousskov on 2013-03-23

merged from connect2ssl (r12735) to get build fixes.

12736. By Alex Rousskov on 2013-03-23

Initial support for "values with spaces" in ACL directives.

same as conf-quoted-str r12733.

12735. By Alex Rousskov on 2013-03-22

Initial support for sharing SSL sessions among SMP workers.

same as shared-ssl-sessions r12733.

12734. By Alex Rousskov on 2013-03-22

Initial support for establishing TCP tunnels with SSL cache_peers.

same as connect2ssl r12733.

12733. By Alex Rousskov on 2013-03-21

Large Rock: Support for caching of large files in rock cache_dirs.

same as large-rock r12530