How do you send a custom header in a cross-domain (CORS) XMLHttpRequest?

Your problem isn't with jquery, it's in how CORS works . Your beforeSend callback was probably working as expected... but browsers won't send custom headers in preflight requests, no matter what. This is by design; the purpose of the preflight request is to determine what information the useragent (browser) is permitted to send beyond the "simple" stuff defined in the CORS spec.

Thus, for the useragent to send any non-simple data (such as your custom header) as part of the preflight request is self-defeating.

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