Http Status-code=502 Proxy Error
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This server received an invalid response from an upstream server it accessed to fulfil the request. This usually does not mean that the upstream server is down (no response 502 error nginx to the gateway/proxy), but rather that the upstream server and the gateway/proxy do not 502 bad gateway fix agree on the protocol for exchanging data. Given that Internet protocols are quite clear, it often means that one or both
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machines have been incorrectly or incompletely programmed. Fixing 502 errors - general This problem is due to poor IP communication between back-end computers, possibly including the Web server at the site you are trying to
Please Explain This 502 Bad Gateway Error
visit. Before analysing this problem, you should clear your browser cache completely. If you are surfing the Web and see this problem for all Web sites you try to visit, then either 1) your ISP has a major equipment failure/overload or 2) there is something wrong with your internal Internet connection e.g. your firewall is not functioning correctly. In the first case, only your ISP can help you. In the second 502 bad gateway nginx/1.4.6 (ubuntu) case, you need to fix whatever it is that is preventing you reaching the Internet. If you get this problem for only some of the Web sites you try to visit then it is likely to be a problem at those sites i.e. one of their pieces of equipment is failing/overloaded. Contact the people at those sites. Fixing 502 errors - CheckUpDown Our service monitors your site for HTTP errors like 502. Use of proxies and caching is increasing on the Web. Our CheckUpDown robot will always try to "drill through" to the real computer that actually hosts the Web site, but we do not have complete control over where our HTTP request actually ends up. If only one link in the chain of computers dealing with our HTTP request is broken, then an error such as 502 can easily occur. Please contact us (email preferred) whenever you encounter 502 errors - there is nothing you can do to sort them out. We then have to liaise with your ISP and the vendor of the Web server software so that they can review the flow of IP data traffic between various computers under their control. 502 errors in the HTTP cycle Any client (e.g. your Web browser or our CheckUpDown
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of
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this site About Us Learn more about Stack Overflow the company Business Learn error 502 google more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question 502 bad gateway phpstorm x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up 502 http://www.checkupdown.com/status/E502.html HTTP Status Code up vote 26 down vote favorite 1 According to the RFC: 10.5.3 502 Bad Gateway The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request. Can invalid response also mean no response at all (e.g. connection refused)? http client status share|improve this question asked Feb http://stackoverflow.com/questions/5011632/502-http-status-code 16 '11 at 1:35 primroot 6351615 add a comment| 1 Answer 1 active oldest votes up vote 24 down vote accepted Yes. Empty or incomplete headers or response body typically caused by broken connections or server side crash can cause 502 errors if accessed via a gateway or proxy. For more information about the network errors https://en.wikipedia.org/wiki/List_of_HTTP_status_codes share|improve this answer edited Mar 28 at 13:00 Shalu T D 332114 answered Feb 16 '11 at 1:41 blinkingled 30123 Is there a fix for this? My apache server is not crashing... –Arif Jul 29 '15 at 7:35 @Arif Get a more stable connection by selecting a less busy WiFi channel or plugging in a shielded network cable until it locks into place with clean connectors. –Cees Timmerman Jan 7 at 15:18 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service
a proxy server. The problem is typically caused for one of two reasons: 1 – The Internet Security and Acceleration (ISA) http://www.tech-faq.com/502-proxy-error.html is configured to throw a proxy error to help guard against external or internally-based Internet threats, and 2- The client or server computers are misconfigured or using outdated software. What is a 502 Proxy Error? A 502 proxy error is typically thrown in the HTTP cycle. When the error occurs, a server (does not have to be a Web server) is filling a 502 bad role similar to a proxy or a gateway server. When a client computer sends an HTTP request (typically a web browser, but can be any software application that is capable of making an HTTP request), it will pass through the server in order to obtain access to the desired URL. The proxy or gateway subsequently receives a 502 error, or invalid response, from the 502 bad gateway server located “upstream” in the attempt to fulfill the client request. The majority of the time the error is thrown, the upstream server is functioning appropriately. The proxy or gateway and upstream servers just cannot agree on the appropriate protocol for exchanging the information requested in the original client HTTP request. In many of these cases, either the proxy or upstream server are not configured correctly or are running incompatible software. Why Does a 502 Proxy Error Get Thrown? During a typical web browsing session, the following is an example of the classic HTTP cycle when a client computer and web server are communicating: Client Computer: The IP address of the desired website will be obtained from the URL of the site from the DNS server. Client Computer: The computer obtains an IP socket connection to the desired IP address and then sends an HTTP data stream through the IP address. Web Server: HTTP data is sent back to the client computer in response to the original HTTP request. The HTTP response will include status codes and other useful information for the client computer. Client Computer: If there