What can cause a persistent “Reload the page to get source for” error in firebug?

Question

I\'m trying to debug the javascript of a specific page, and I keep seeing

Reload the page to get source for page.htm in Firebug.

On Chrome, I\'m

Answer 1

One other potential cause of the “Reload the page to get source for” message is the server returning an empty response. Check the response headers for Content-Length:0. If this isn't what you anticipated for the response, it is probably time to do some debugging on the server side of things. Note that empty responses do not always cause the "Reload the page to get source for" message -- however, I encountered at least one situation where this was the underlying problem.