[TS-769] traffic server loops forever if the origin sends back a 505 and the connection is keep-alive

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.8
• Fix Version/s: 2.1.9
• Component/s: HTTP

Environment

This was observed in the Yahoo! version of traffic server

• Assignee: Bryan Call
• Reporter: Bryan Call
• Created: 10/May/11 18:29
• Updated: 19/Aug/11 01:19
• Resolved: 20/May/11 00:47

Description

Traffic server tries to downgrade the connection/protocol when it gets back a 505 from the origin server. First it removes keep-alive and retries, then traffic sever start to downgrade the http protocol version and retry.

However, another part of the code turns keep-alive back on and traffic server will loop turning on and off keep-alive and making the same request to the origin server.

I fixed the issue in the Yahoo! tree by alway downgrade keep-alive and protocol version together. This will eventually stop after it has tried HTTP/0.9. Also, I added an option to not downgrade and retry at all when getting a 505.

I have to verify that this is also an issue with the Apache tree. I looked over the code and it doesn't look like it changed at all from the Yahoo! tree, so the bug should also be there.