I'm trying to figure out this weird intermittent issue.
I have two squid servers running, non-caching, non-transparent.
Client -> Squid1 -> Squid2 -> Internet
All HTTPS requests work as expected, but randomly, about 50% of the time, HTTP requests fail.
The reason for the failure is that the first squid server (Squid1) is not correctly forwarding the request to the second. It is stripping away the hostname, and obviously the second squid server has no clue what to do with it then!
Refreshing either create or resolves the issue, again, seemingly at random.
The following is a copy of the access logs for two successful requests, followed by a failure:
Squid1:
1535965629.452 81 3.3.3.3 TCP_MISS/200 5766 GET http://redacted.com/messages/391/ - FIRSTUP_PARENT/2.2.2.2 text/html
1535965634.678 71 3.3.3.3 TCP_MISS/200 5759 GET http://redacted.com/messages/391/ - FIRSTUP_PARENT/2.2.2.2 text/html
1535965636.673 1 3.3.3.3 TCP_MISS/400 4009 GET http://redacted.com/messages/391/ - FIRSTUP_PARENT/2.2.2.2 text/html
Squid2:
1535965629.447 79 1.1.1.1 TCP_MISS/200 5673 GET http://redacted.com/messages/391/ connect HIER_DIRECT/4.4.4.4 text/html
1535965634.673 68 1.1.1.1 TCP_MISS/200 5671 GET http://redacted.com/messages/391/ connect HIER_DIRECT/4.4.4.4 text/html
1535965636.668 0 1.1.1.1 TAG_NONE/400 3916 GET /messages/391/ - HIER_NONE/- text/html
squid.conf from Squid1:
http_port 3128 name=port_3128
http_access allow all
nonhierarchical_direct off
acl port_3128_acl myportname port_3128
always_direct deny port_3128_acl
never_direct allow port_3128_acl
# 3128
cache_peer 2.2.2.2 parent 3128 0 no-query proxy-only default name=proxy3128
cache_peer_access proxy3128 allow port_3128_acl
cache_peer_access proxy3128 deny all
squid.conf from Squid2:
http_access allow all
http_port 3128
Where:
1.1.1.1: Squid1
2.2.2.2: Squid2
3.3.3.3: client
4.4.4.4: Web Server
I can't see any obvious error in my configuration, and the intermittent nature of it makes me think it might be some sort of bug. I'd love to hear if anyone else has run into this.
Kind Regards,
Michael Thomas
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