I finally stumbled upon this link “A CORS POST request works from plain javascript, but why not with jQuery?” that notes that jQuery 1.5.1 adds the
Access-Control-Request-Headers: x-requested-with
header to all CORS requests. jQuery 1.5.2 does not do this. Also, according to the same question, setting a server response header of
Access-Control-Allow-Headers: *
does not allow the response to continue. You need to ensure the response header specifically includes the required headers. ie:
Access-Control-Allow-Headers: x-requested-with
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