Ah, so you have a piece of code which checks if an HTTP header exists in the response? Beware of case sensitivity, access-control-allow-origin != Access-Control-Allow-Origin.
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Guzzle returns HTTP headers in an array, so checking for `Access-Control-Allow-Origin` will fail if it's lowercase.
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I was just yesterday getting an error from Apple's mediastreamvalidator for a Content-Type in lower case letters :/
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