Due to a bug in my server code, an exception is being thrown and my web server' s Error 500 page is. 第一回は、 Web集客を成功させる上で絶対に知っておきたい「 503エラー」 に関するお話。 503エラーとは、 膨大なアクセスが. This is almost certainly a web application firewall. Check whether your server is running mod_ security. You will need to review the rules used by mod_ security or whatever else is running on the server to find the one that is. · i was able to solve my problems. i had to explicitly put method: " GET" in the ajax request. Request( url, { method: " GET". When i click run button show this error in chrome console and don' t alert anything POST php 503 ( Service Unavailable) index.