Find the source of an XMLHttpRequest using Chrome/Firefox dev tools

StackOverflow https://stackoverflow.com/questions/23097817

Question

I'm trying to debug a web application not written by me. There is a failing XMLHttpRequest being made:

XMLHttpRequest cannot load ... No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin '...' is therefore not allowed access.

Is there a way, preferably using Chrome developer tools, to locate the source of this call?

Was it helpful?

Solution

It turns out - yes, there is. That "XHR Breakpoints" option on the side which I had always ignored:

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It works perfectly.

Firefox has an identical feature:

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