Only allow a single Allow Origin (Access Control) value #1723
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The relevant specification text is,
Rather than allowing a space-separated list of origins, it is
either a single origin or the string "null".[0]
and
Note: null should not be used[1]
it is clear that the previous HeaderSet usage was wrong. (Also note
that the value is case sensitive)[0].
[0]: https://www.w3.org/TR/cors/
[1]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin
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The relevant specification text is,
and
it is clear that the previous HeaderSet usage was wrong. (Also note
that the value is case sensitive)[0].
0: https://www.w3.org/TR/cors/
1: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin