[jira] [Created] (TS-4733) Cache writes fail when client requests IMS and server replies 200

["Shrihari (JIRA)" <ji...@apache.org>]

Shrihari created TS-4733:
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             Summary: Cache writes fail when client requests IMS and server replies 200
                 Key: TS-4733
                 URL: https://issues.apache.org/jira/browse/TS-4733
             Project: Traffic Server
          Issue Type: Bug
          Components: Core
            Reporter: Shrihari


I think this issue happens because of a fix applied in issue TS-3828.
Imagine a case where the client requests 'IMS' and the cache doesn't have the URL. In that case, we remove the IMS and send the request to origin server. On receiving the response back, we send 304 to client and THEN write to cache.

However, when we build 304 response to client, we set s->hdr_info.response_content_length = 0.

Since this call to build_response happens before we setup a tunnel to write the data from 'http_server' to 'cache' we lose this information.
While setting up this tunnel, we rely on the above field to get the size to write. However, since we have already zeroed it out we don't write anything to the cache.

I verified that if I use length from the server_response instead of using the pre-computed one, it solves the problem. Though, I am not sure if that should be the solution. I am still looking into the code to see what is the right thing to do.



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