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How to Test Web Application

 
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I have a web application that occassionally hangs. It is not a server side error. Is there an application that I can run to see what the browser is asking for from the server and what the responses are? Including the requests for images. Any help would be appreciated.

More Information:
The layout for the site contains an iframe where all of the content loads (everything outside of the iframe is static). When the user submits a form in the iframe we display a waiting image and show an opaque div over the entire document. On the 'onlo ad' function for the page returned after the form submittal we call a function to hide the waiting image and opaque div. The problem is that occassionally that function is not called. When it happens, in the status bar the browser says 'Waiting for http://....'.

I think it might be a problem with tomcat but I need to get all requests and responses to nail down the exact problem.
 
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If you're looking for something to run in the browser, then the Firefox extension LiveHttpHeaders can track all requests and responses.

For a serverside solution you could add request/response filters to the web app that log all desired information.
 
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NetBeans has a Http Monitor service that tracks all requests and responses in registered web servers.
 
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