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https://issues.apache.org/jira/browse/TS-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13761893#comment-13761893
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Mohamad Khateeb commented on TS-1086:
-------------------------------------
I have attached a patch for this issue .
the problem was , when ATS fails to get the cache write lock it changes to
proxy mode , so when the object is stale and ATS has already made a conditional
get to the server , ATS now must remove the conditional request headers that
have been added by it .
the ATS just removes "If-Modified-Since" header from the request , but a
conditional get made by ATS can also have "If-None-Match" header , if etag
header is found in the cached response.
The patch that I have attached is just checking if the "If-None-Match" header
is added by ATS . If so remove it , if it's not in the original client request.
> Returning 304 response to unconditional request
> -----------------------------------------------
>
> Key: TS-1086
> URL: https://issues.apache.org/jira/browse/TS-1086
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 3.0.1
> Environment: Observed on Amazon/ec2 build, which is 3.0.1 on
> redhat-like linux.
> Reporter: Nick Kew
> Fix For: 4.2.0
>
> Attachments: TS-1086.diff
>
>
> ab is reporting HTTP 304 responses to a small number of unconditional
> requests in a test run:
> GET /testfile.html HTTP/1.0^M
> Host: localhost^M
> User-Agent: ApacheBench/2.3^M
> Accept: */*^M
> ^M
> HTTP/1.0 304 Not Modified^M
> Date: Mon, 21 Nov 2011 14:23:48 GMT^M
> Server: ATS/3.0.1^M
> ETag: "5e24-24cd-4b23b69f6e89c"^M
> Cache-Control: max-age=60^M
> Age: 2^M
> ^M
> I presume what's happening is that trafficserver is sending a conditional
> request with If-Modified-Since to the origin server, and then returning the
> origin's 304 response to the client's unconditional request.
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