CORS preflight request fails due to a standard header

Question

After a lot of struggling, I finally found the problem. I configured a request mapping in Spring to handle OPTIONS traffic, like this:

@RequestMapping(value= "/api/**", method=RequestMethod.OPTIONS)
public void corsHeaders(HttpServletResponse response) {
    response.addHeader("Access-Control-Allow-Origin", "*");
    response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
    response.addHeader("Access-Control-Allow-Headers", "origin, content-type, accept, x-requested-with");
    response.addHeader("Access-Control-Max-Age", "3600");
}

I did not know that by default Spring uses a default CORS processor, and it seems it was interfering with my request mapping. Deleting my request mapping and adding the @CrossOrigin annotation to the appropriate request mappings solved the problem.

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