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I have a web application that requests for the same resource multiple times during a transaction. I am seeing that the application is getting a HTTP 200 response from the server where it should be getting a HTTP 304. I have seen the fiddler reports and they do have the If-Modified-Since header in the requests. Yet, the server sends the content every single time, instead of just a 304, which is causing quite an overhead. I did not have the problem in my previous deployment.

I am using IBM WebSphere application server with IBM HTTP Server. I have tried changing my IE settings, it doesn't seem to have any that would force such a behavior.

Any tips here?

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james
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  • Is it a static file served by IHS? Is it a static file served by WAS? is the WAS Plugin ESI cache enabled? Is it a dynamic URL served by WAS? – covener Feb 10 '15 at 03:12
  • The files are static files served by WAS. IHS is running over WAS. WAS Plugin ESI cache is enabled. It is not a dynamic URL. – james Feb 10 '15 at 09:00

1 Answers1

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What does the Fiddler trace "RAW" format show for Request and Response headers? There may be other header affecting such as: 

Cache_Control:
Pragma:

or other headers preventing caching or triggering need for re-validation.

Setting the 

LogLevel="Trace"

in the plugin-cfg.xml for the WAS Plug-in module on the IHS webserver is also a good capture of HTTP headers.

Once you find the Process/Thread ID (just after the timestamp) of the request in the Plug-in log (http_plugin.log default or as defined in plugin-cfg.xml) you can then see the request and response headers sent.

Also knowing your exact versions of IHS, Plug-in and WAS for the working previous deployment as well as the new non-working setup are helpful. Does this occur for newer versions of IE browser or other brands of Browser such as Firefox or Chrome? That would help isolate if it is consistent with all browsers or related to type/version of browser used.

Serguei Fedorov
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brownrob
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