headers the server responses with.
Cookie for example. If the server responses to the SourceMapURL request with
the browser will respect the header, set that cookie and will send it with each request back to the server.
In the following example, the page sends a SourceMapURL request to both
px-blog-source-map-anti-debug.appspot.com (same origin) and
and you can see how that request is responded with a new cookie that is from now on respected by the browser until it is removed.
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