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Http 1.01 Proxy Error 502

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The Proxy Server Received An Invalid Response From An Upstream Server. Apache

company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges 502 proxy error fix Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody ah01102: error reading status line from remote server can ask a question Anybody can answer The best answers are voted up and rise to the top Proxy Error 502 “Reason: Error reading from remote server” with Apache 2.2.3 (Debian) mod_proxy and Jetty 6.1.18 up vote 47 down vote favorite 24 Apache is receiving requests at port :80 and proxying them to Jetty at port :8080 The proxy server received

(20014)internal Error: Proxy: Error Reading Status Line From Remote Server

an invalid response from an upstream server The proxy server could not handle the request GET /. My dilemma: Everything works fine normally (fast requests, few seconds or few tens of seconds long requests are processed ok). Problems occur when request processing takes long (few minutes?). If I issue request instead directly to Jetty at port :8080 the request is processed OK. So problem is likely to sit somewhere between Apache and Jetty where I am using mod_proxy. How to solve this? I have already tried some "tricks" related to KeepAlive settings, without luck. Here is my current configuration, any suggestions? #keepalive Off ## I have tried this, does not help #SetEnv force-proxy-request-1.0 1 ## I have tried this, does not help #SetEnv proxy-nokeepalive 1 ## I have tried this, does not help #SetEnv proxy-initial-not-pooled 1 ## I have tried this, does not help KeepAlive 20 ## I have tried this, does not help KeepAliveTimeout 600 ## I have tried this, does not help ProxyTimeout 600 ## I have tried this, does not help NameVirtualHost *:80 ServerAdmin [email protected] ServerName www.mydomain.fi ServerAl

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The Proxy Server Received An Invalid Response From An Upstream Server. Apache Reverse Proxy

helping each other. Join them; it only takes a minute: Sign up 502 Proxy Errors between IIS and Apache2 up vote 6 down vote favorite I am currently running apache2 on a SUSE instance @EC2. As part of http://serverfault.com/questions/185894/proxy-error-502-reason-error-reading-from-remote-server-with-apache-2-2-3-de my site, my data uses mod_proxy to hit a REST server running IIS via Proxy/ReverseProxy. After setting up my vhosts, enabling mod_proxy and establishing my config, I found that I was frequently encountering 502 errors. These errors were of the Proxy Error and Bad Gateway flavour. After doing some considerable google, I found that there was a difference in the way IIS and apache terminate their connections which was causing the error. After setting the following environment http://stackoverflow.com/questions/12303087/502-proxy-errors-between-iis-and-apache2 variables, performance has improved markedly: SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 SetEnv proxy-initial-not-pooled 1 What I'm wondering is why this works and what an ideal configuration would look like. Is my understanding that, with the Env variables: I am forcing an HTTP 1.0 request (which will standardize the termination expectaions) NOT keeping alive any connections NOT using any pooled connections correct? What if I need to use pooled connections? What if I want to use keep-alives? In short, I'm looking for best practices to replace the toothpick and glue solution I'm currently using apache iis proxy mod-proxy share|improve this question edited Oct 8 '12 at 11:14 gks 2,37131436 asked Sep 6 '12 at 15:08 user1026361 2,20011017 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote I see this question has been around for a while, so I thought I would throw in my 2 cents. More of my experience anyways... As far as I am aware those three env variables or settings are ok in production. Your understanding of them is correct also. When I had this problem way back I found this link to be usefull in the explaination of the problem. It only occurrs with IIS in the backend.... Just note that the intial pooled setting will impact performance expecially in Http/1.0 clients... I have never noticed anything, however, th

The idea for this has grown because of the fact that our client had only one public IP address at the time, but had to run multiple sites. http://www.blackmanticore.com/c186867ed0554264dc677006d9dd3cd8 Rather than running the sites in IIS on different ports, we setup the http://qiita.com/tsujimitsu/items/f4fbd47118cbbd9441fc Apache2 to proxy requests to the IIS back-end, so the sites were accessible by means of sub-urls. E.g.: http://myserver/mysubdomain1/ -> http://internal-ip:my-port/ For this, we used mod_proxy, and the ProxyPass and ProxyPassReverse. The problem Lately, our client complained of regular errors when surfing the sites. Apache2 would give HTTP error 502 (Bad gateway) proxy error on the page. During this, the error.log shows errors like: [Sat Aug 2 13:16:25 2009] [error] [client 192.168.10.2] proxy: error reading status line from remote server (null), referer: http://my-domain.be/ The cause This behaviour was reported by other users, who had a similar setup. The common nominator was always the combination of IIS, and Apache as a proxy of it. There are many explanations available, the Apache's from remote server Bugzilla included, but I'll keep the explanation short. There is a conflict between the HTTP Keep-alive of IIS and Apache2. IIS's implementation of HTTP keep-alive is the root of the errors our client was getting. The solution The only true and proper solution is to have Apache2, or rather mod_proxy effectively disable HTTP keep-alive. This can be done by adding additional configuration parameters in your Apache configuration. Add these to the VirtualHost that's doing the proxying (i.e. where the ProxyPass and ProxyPassReverse directives are located. SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 SetEnv proxy-initial-not-pooled 1 They are added inside the tags. Additionally, in the same level as the SetEnv directives you've just added, check whether the timeout is also set: ProxyTimeout 600 Links This solution has been tested with Apache2 on Debian Lenny 5.0 (security updates installed), with IIS on Windows 2008 Standard (all updates installed). I used the following links as reference: https://issues.apache.org/bugzilla/show_bug.cgi?id=37770 computer, linux, windows, network comments e-mail this Tags computersoftwarewindowsmicrosoftlinuxhardwareexchangenetworknewshomemacvmwareoffice365powershellmsofficeserversqlserversoaringinternetadsbseventsterminalserveresxrdsdellvirtualizationoutlookantivirussite Archive « ‹October 2016› »SunMonTueWedThuFriSat12345678910111213141516171819202122232425262728293031 Links - @harkx - Cats & Dogs - Soaring Club Albatros (BE) Quote « I needed a password with eight characte

攻撃的または迷惑な内容を含んでいます 不適切な内容を含んでいます 送信19ストック0コメントストックストック済み解除 この記事は最終更新日から1年以上が経過しています。リバースプロキシサーバへアクセス後、しばらく時間を置き、再度アクセス(ブラウザの更新ボタン押下)すると502エラーが表示される。 アドレスバーに再度URLを入力し、アクセスすると問題なくページが表示される。 Proxy Error 発生時の状況 事象発生環境 Reverse Proxy Server: CentOS 6.5 / httpd.x86_64 2.2.15-31.el6.centos Backend Server: Windows Server 2008 R2 / IIS 7 Browser: Windows 8.1 / Internet Explorer 11 Apache 設定 # cat /etc/httpd/conf.d/proxy.conf ProxyPass /iis http://172.31.12.130/ ProxyPassReverse /iis http://172.31.12.130/ Proxy Error (502) Internet Explorer 11 Apache Access Log # tail -f /var/log/httpd/access_log 127.0.0.1 - - [28/Feb/2015:22:12:32 +0900] "GET /iis/ HTTP/1.1" 502 465 "-" "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; MASPJS; rv:11.0) like Gecko" 事象の改善方法 調べているといくつか設定方法はあることがわかった。以下に調べた範囲の情報を記載します。 1. proxy-initial-not-pooled 下記サイトを参考に設定しました。 http://qiita.com/mist_dev/items/e902854998074fe4bef1 # cat /etc/httpd/conf.d/proxy.conf SetEnv proxy-initial-not-pooled 1 ProxyPass /iis http://172.31.12.130/ ProxyPassReverse /iis http://172.31.12.130/ # /etc/init.d/httpd graceful 2. force-proxy-request & proxy-nokeepalive 下記サイトを参考に設定しました。 http://startnews24.com/?p=23553 http://se-suganuma.blogspot.jp/2011/07/apachereverse-proxy502-proxy-error.html # cat /etc/httpd/conf.d/proxy.conf SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 ProxyPass /iis http://172.31.12.130/ ProxyPassReverse /iis http://172.31.12.130/ # /etc/init.d/httpd graceful 3. retry & keepalive 下記サイトを参考に設定しました。 http://serverfault.com/questions/185894/proxy-error-502-reason-error-reading-from-remote-server-with-apache-2-2-3-de http://stackoverflow.com/questions/169453/bad-gateway-502-error-with-apache-mod-proxy-and-tomcat # cat /etc/httpd/conf.d/proxy.conf ProxyPass /iis h

 

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