javascriptdebuggingxmlhttprequestgoogle-chrome-devtools
Find the source of an XMLHttpRequest using Chrome/Firefox dev tools
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?
Solution
It turns out - yes, there is. That "XHR Breakpoints" option on the side which I had always ignored:
It works perfectly.
Firefox has an identical feature:
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