Http Connection Error 502
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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 to the gateway/proxy), but rather that the upstream 502 error nginx server and the gateway/proxy do not agree on the protocol for exchanging data. Given that Internet
502 Bad Gateway Fix
protocols are quite clear, it often means that one or both machines have been incorrectly or incompletely programmed. Fixing 502 errors - general This 502 bad gateway meaning problem is due to poor IP communication between back-end computers, possibly including the Web server at the site you are trying to visit. Before analysing this problem, you should clear your browser cache completely. If you are surfing the Web please explain this 502 bad gateway error 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 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
504 Bad Gateway
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 robot) goes through the following cycle when it communicates with the Web server: Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs). Open an IP socket connection t
Macs iPad iPhone Internet & Network Digital Cameras Home Theater Getting More Help Buy Buying Guides Product Reviews Software & Apps Do More Web & Search Social Media Gaming New & Next Fix Internet & Network Understanding 502 proxy error and Fixing 502 Bad Gateway Errors Tactics to Fix a 502 Bad Gateway Error Share Pin 502 police code Email 502 Bad Gateway Error. © THORDOG Internet & Network Error Messages Basics by Tim Fisher Updated October 02, 2016 The 502 Bad
Http 501
Gateway error is an HTTP status code that means that one server received an invalid response from another server.The Bad Gateway error can be customized by each website. While fairly uncommon, different web servers do describe this error http://www.checkupdown.com/status/E502.html differently. Here are some common ways you might see it.How the 502 Error Appears"502 Bad Gateway""502 Service Temporarily Overloaded""Error 502""Temporary Error (502)" "502 Proxy Error""502 Server Error: The server encountered a temporary error and could not complete your request""HTTP 502""502. That's an error""Bad Gateway: The proxy server received an invalid response from an upstream server""HTTP Error 502 - Bad Gateway"The 502 Bad Gateway error displays inside the Internet browser window, just as web pages do.Twitter's famous http://pcsupport.about.com/od/findbyerrormessage/a/502error.htm "fail whale" error that says Twitter is over capacity is actually a 502 Bad Gateway error (even though a 503 Error would make more sense).A Bad Gateway error received in Windows Update generates a 0x80244021 error code or the message WU_E_PT_HTTP_STATUS_BAD_GATEWAY.When Google services, like Google Search or Gmail, are experiencing a 502 Bad Gateway, they often show Server Error, or sometimes just 502, on the screen.502 Bad Gateway errors are completely independent of your particular setup, meaning that you could see one in any browser, on any operating system, and on any device. Cause of 502 Bad Gateway ErrorsOften, Bad Gateway errors are caused by issues between servers online that you have no control over. However, sometimes there is no real issue but your browser thinks there is one thanks to an issue with your browser, a problem with your home networking equipment, or some other in-your-control reason. Note: Microsoft IIS web servers often give more information about the cause of a particular 502 Bad Gateway error by adding an extra digit after the 502 as in HTTP Error 502.3 - Web server received an invalid response while acting as a gateway or proxy which means Bad Gateway: Forwarder Connection Error (ARR). You can see a complete list here.Tip: An HTTP Error 502.1 - Bad Gateway error refers to a CGI application timeout problem and is better
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 this site About Us Learn more about Stack Overflow the company Business Learn more http://stackoverflow.com/questions/5011632/502-http-status-code about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users https://www.digitalocean.com/community/tutorials/how-to-troubleshoot-common-http-error-codes Badges Ask Question 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 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, bad gateway 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 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 502 502 bad gateway 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. Not the answer you're looking for? Browse other questions tagged http client status or ask your own question. asked 5 years ago viewed 40541 times active 6 months ago Blog Stack Overflow Podcast #91 - Can You Stump Nick Craver? Linked 0 Overcome 502 Error for Web App with Long Running Function 0 In HTTP 502, what is meant by an invalid response? Related 667HTTP status code for update and delete?459REST HTTP status codes for failed validation or invalid duplicate1HTTP status co
In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean Community Menu Tutorials Questions Projects Meetups Main Site Sign Up Log In submit View All Results By: Mitchell Anicas Subscribe Subscribed Share Contents Contents We hope you find this tutorial helpful. In addition to guides like this one, we provide simple cloud infrastructure for developers. Learn more → 10 How To Troubleshoot Common HTTP Error Codes Posted Oct 24, 2014 82.4k views FAQ Apache Nginx Introduction When accessing a web server or application, every HTTP request that is received by a server is responded to with an HTTP status code. HTTP status codes are three-digit codes, and are grouped into five different classes. The class of a status code can be quickly identified by its first digit: 1xx: Informational 2xx: Success 3xx: Redirection 4xx: Client Error 5xx: Server Error This guide focuses on identifying and troubleshooting the most commonly encountered HTTP error codes, i.e. 4xx and 5xx status codes, from a system administrator's perspective. There are many situations that could cause a web server to respond to a request with a particular error code--we will cover common potential causes and solutions. Client and Server Error Overview Client errors, or HTTP status codes from 400 to 499, are the result of HTTP requests sent by a user client (i.e. a web browser or other HTTP client). Even though these types of errors are client-related, it is often useful to know which error code a user is encountering to determine if the potential issue can be fixed by server configuration. Server errors, or HTTP status codes from 500 to 599, are returned by a web server when it is aware that an error has occurred or is otherwise not able to process the request. General Troubleshooting Tips When using a web browser to test a web server, refresh the browser after making server changes Check server logs for more details about how the server is handling the requests. For example, web servers such as Apache or Nginx produce two files called access.log and error.log that can be scanned for relevant information Keep in mind that HTTP status code definitions are part of a standard that is implemented by the application that is servi