Title: Fixing 520 Errors Last modified: September 16, 2016 --- # Fixing 520 Errors * [thellimist](https://wordpress.org/support/users/furkan811/) * (@furkan811) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/) * If you are getting [520](https://support.cloudflare.com/hc/en-us/articles/200171936-Error-520-Web-server-is-returning-an-unknown-error) error most likely your headers exceed CloudFlare’s header size limit (over 8kb). * We’re planning to release a new version fixing the issue. * To temporarly fix your website you need to disable HTTP/2 Server Push feature. * – SSH to your server. – open /your_wordpress_path/wp-content/plugins/cloudflare/ cloudflare.php with your preferred text editor. – Put “//” in the beginning of line 39. * It should like as following * ``` // Enable HTTP2 Server Push //add_action('init', array('\CF\Hooks\HTTP2ServerPush', 'init')); ``` * Disabling HTTP/2 Server Push will only reverse the added performance benefits to your website. * ================================================================= * Cloudflare plugin has HTTP/2 Server Push feature which speeds your WordPress blog. To know how HTTP/2 Server Push works please read this [blog](https://blog.cloudflare.com/announcing-support-for-http-2-server-push-2/) post. * If you have additional issues or questions feel free to comment. - This topic was modified 9 years, 7 months ago by [thellimist](https://wordpress.org/support/users/furkan811/). - This topic was modified 9 years, 7 months ago by [thellimist](https://wordpress.org/support/users/furkan811/). Viewing 11 replies - 1 through 11 (of 11 total) * [ᜌᜓᜃᜒ (Yuki|雪亮) 🇵🇭](https://wordpress.org/support/users/laibcoms/) * (@laibcoms) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8189965) * Works. * If it will help, my setup is: * Multisite * Flexible SSL * WordPress HTTPS ( WP plugin) * WordPress MU Domain Mapping (WP plugin) * CloudFlare Flexible SSL( WP plugin) * and of course CloudFlare WP plugin. * [marcoman89](https://wordpress.org/support/users/marcoman89/) * (@marcoman89) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190140) * Fix works. Thanks * [Jack](https://wordpress.org/support/users/moxie/) * (@moxie) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190646) * Could work, but what regular WP user has access to SSH and nows/wants to use it? Hopefully this will be fixed soon in the plugin. * Thread Starter [thellimist](https://wordpress.org/support/users/furkan811/) * (@furkan811) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190691) * We’ve uploaded version 3.0.1 fixing 520 errors. If you still have any issues related with this I’ll gladly help. * Changelog: [https://en-gb.wordpress.org/plugins/cloudflare/changelog/](https://en-gb.wordpress.org/plugins/cloudflare/changelog/) * [visualblind](https://wordpress.org/support/users/visualblind/) * (@visualblind) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190724) * Still having http 502 errors. * ``` root@nginx02:/var/log/nginx# nginx -v && php -v nginx version: nginx/1.10.0 PHP 7.0.8-0ubuntu0.16.04.2 (cli) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.8-0ubuntu0.16.04.2, Copyright (c) 1999-2016, by Zend Technologies root@nginx02:/var/log/nginx# dpkg -l | egrep 'php|nginx' rc nginx-common 1.10.0-0ubuntu0.16.04.2 all small, powerful, scalable web/proxy server - common files ii nginx-custom 1.10.0-3 amd64 nginx web/proxy server (extended version) ii nginx-ee 1.10.0-3 all small, powerful, scalable web/proxy server - ee files ii php-common 1:35ubuntu6 all Common files for PHP packages ii php-curl 1:7.0+35ubuntu6 all CURL module for PHP [default] rc php-memcache 3.0.9~20151130.fdbd46b-2 amd64 memcache extension module for PHP5 ii php-memcached 2.2.0-51-ge573a6e+2.2.0-2build2 amd64 memcached extension module for PHP5, uses libmemcached ii php-mysql 1:7.0+35ubuntu6 all MySQL module for PHP [default] ii php-pear 1:1.10.1+submodules+notgz-6 all PEAR Base System ii php-readline 1:7.0+35ubuntu6 all readline module for PHP [default] ii php-ssh2 0.12-39-g3dfe336+0.12-1build1 amd64 Bindings for the libssh2 library ii php-xml 1:7.0+35ubuntu6 all DOM, SimpleXML, WDDX, XML, and XSL module for PHP [default] ii php-zip 1:7.0+35ubuntu6 all Zip module for PHP [default] ii php7.0-cli 7.0.8-0ubuntu0.16.04.2 amd64 command-line interpreter for the PHP scripting language ii php7.0-common 7.0.8-0ubuntu0.16.04.2 amd64 documentation, examples and common module for PHP ii php7.0-curl 7.0.8-0ubuntu0.16.04.2 amd64 CURL module for PHP ii php7.0-fpm 7.0.8-0ubuntu0.16.04.2 amd64 server-side, HTML-embedded scripting language (FPM-CGI binary) ii php7.0-json 7.0.8-0ubuntu0.16.04.2 amd64 JSON module for PHP ii php7.0-mbstring 7.0.8-0ubuntu0.16.04.2 amd64 MBSTRING module for PHP ii php7.0-mysql 7.0.8-0ubuntu0.16.04.2 amd64 MySQL module for PHP ii php7.0-opcache 7.0.8-0ubuntu0.16.04.2 amd64 Zend OpCache module for PHP ii php7.0-phpdbg 7.0.8-0ubuntu0.16.04.2 amd64 server-side, HTML-embedded scripting language (PHPDBG binary) ii php7.0-readline 7.0.8-0ubuntu0.16.04.2 amd64 readline module for PHP ii php7.0-xml 7.0.8-0ubuntu0.16.04.2 amd64 DOM, SimpleXML, WDDX, XML, and XSL module for PHP ii php7.0-zip 7.0.8-0ubuntu0.16.04.2 amd64 Zip module for PHP ``` - This reply was modified 9 years, 7 months ago by [Steven Stern (sterndata)](https://wordpress.org/support/users/sterndata/). - This reply was modified 9 years, 7 months ago by [Steven Stern (sterndata)](https://wordpress.org/support/users/sterndata/). Reason: put code in backticks * [moody1337](https://wordpress.org/support/users/moody1337/) * (@moody1337) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190754) * Hey thellimist, * installed the fix right now, but again I got the following error: * upstream sent too big header while reading response header from upstream * The version before the 3.0.0-update works. * Thread Starter [thellimist](https://wordpress.org/support/users/furkan811/) * (@furkan811) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190762) * Hi moody1337, * Can you upload a full error log? * Thanks * [moody1337](https://wordpress.org/support/users/moody1337/) * (@moody1337) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190768) * Thats everything I got: * 2016/09/16 16:56:38 [error] 1756#1756: *129842 upstream sent too big header while reading response header from upstream, client: 94.135.196.154, server: test.wihel. de, request: “GET /wp-admin/ HTTP/2.0”, upstream: “fastcgi://unix:/run/php/php- fpm1.sock:”, host: “test.wihel.de” * [bitsum](https://wordpress.org/support/users/bitsum/) * (@bitsum) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8190912) * Or just remove this plugin. Why do we need it? Cloudflare works fine w/o. * [lauw8](https://wordpress.org/support/users/lauw8/) * (@lauw8) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8193446) * I had the same issue on [my website](https://echtgezondafvallen.nl), so I went back to version 1.3.24. They also released a new update again that is version 3.0.2, but that one is still giving problems. - This reply was modified 9 years, 7 months ago by [lauw8](https://wordpress.org/support/users/lauw8/). - This reply was modified 9 years, 7 months ago by [lauw8](https://wordpress.org/support/users/lauw8/). * [jwineman](https://wordpress.org/support/users/jwineman/) * (@jwineman) * [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8193792) * Hi [@lauw8](https://wordpress.org/support/users/lauw8/), * Can you give me more details on the problems you’re seeing? What specifically is wrong? * Thanks, John Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Fixing 520 Errors’ is closed to new replies. * ![](https://ps.w.org/cloudflare/assets/icon-256x256.png?rev=2471183) * [Cloudflare](https://wordpress.org/plugins/cloudflare/) * [Frequently Asked Questions](https://wordpress.org/plugins/cloudflare/#faq) * [Support Threads](https://wordpress.org/support/plugin/cloudflare/) * [Active Topics](https://wordpress.org/support/plugin/cloudflare/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/cloudflare/unresolved/) * [Reviews](https://wordpress.org/support/plugin/cloudflare/reviews/) * 13 replies * 9 participants * Last reply from: [jwineman](https://wordpress.org/support/users/jwineman/) * Last activity: [9 years, 7 months ago](https://wordpress.org/support/topic/520-errors/#post-8193792) * Status: not resolved