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  • developer.mozilla.org/en-US/docs/Web/HTTP/CORS Commented Dec 3, 2018 at 17:26
  • Thanx @Majenko but that is too general and doesn't address the esp8266 scenario. Commented Dec 3, 2018 at 17:46
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    add the CORS header to every response, not only for 'preflight' OPTIONS request. @Majenko, only resources ncluded from other server need CORS headers Commented Dec 3, 2018 at 18:27
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    you don't need the OPTIONS support, just add the ACAO header to the response Commented Dec 3, 2018 at 20:12
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    @Juraj and @ dandavis I combined both your comments and it now works! I removed the OPTIONS part and put server.sendHeader("Access-Control-Allow-Origin","*"); in the response. Thanx! If either want to put it in the form of an answer I will be happy to accept it. Commented Dec 3, 2018 at 23:01