# Safari intermittently hangs when loading FCGI request **URL:** \ **Category:** NGINX\ **Created:** [October 18, 2010, 11:08pm UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688 "2010-10-18T23:08:13Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\ **Post date:** [October 18, 2010, 11:08pm UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688/1 "2010-10-18T23:08:13Z")
As you can see in attached debug log there is ±20 second delay before returning the page to Safari 5.0.2. Profiling PHP-FPM and PHP script itself show that they render under 0.03 seconds. The connection stall is not happening in Firefox 3.6.10 These are the response headers in Safari: Connection:close Content-Type:text/html Date:Mon, 18 Oct 2010 20:56:23 GMT Server:nginx/0.8.52 Transfer-Encoding:Identity These are the response headers in Firefox: Server: nginx/0.8.52 Date: Mon, 18 Oct 2010 20:56:02 GMT Content-Type: text/html Transfer-Encoding: chunked Connection: close I tested Nginx 0.8.52 with gzip off, keepalive\_timeout 0, fastcgi\_max\_temp\_file\_size 0 but no difference. nginx version: nginx/0.8.52 TLS SNI support enabled configure arguments: --conf-path=/etc/nginx/nginx.conf –error-log-path=/var/log/nginx/error.log --pid-path=/var/run/nginx.pid –lock-path=/var/lock/nginx.lock –http-log-path=/var/log/nginx/access.log –http-client-body-temp-path=/var/lib/nginx/body –http-proxy-temp-path=/var/lib/nginx/proxy –http-fastcgi-temp-path=/var/lib/nginx/fastcgi –http-uwsgi-temp-path=/var/lib/nginx/uwsgi –http-scgi-temp-path=/var/lib/nginx/scgi --with-debug –with-http\_stub\_status\_module --with-http\_flv\_module –with-http\_ssl\_module --with-http\_gzip\_static\_module –with-http\_realip\_module --with-ipv6 --without-mail\_pop3\_module –without-mail\_imap\_module --without-mail\_smtp\_module --with-file-aio –add-module=/build/buildd/nginx-0.8.52/contrib/nginx-upload-progress-module ---
**Author:** ![senh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/e47c2d/32.png) [@senh](https://www.ruby-forum.com/u/senh)\ **Post date:** [October 19, 2010, 10:17am UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688/2 "2010-10-19T10:17:46Z")
Hello! On Mon, Oct 18, 2010 at 11:08:13PM +0200, Sen Haerens wrote: > Transfer-Encoding:Identity > > –http-scgi-temp-path=/var/lib/nginx/scgi --with-debug > –with-http\_stub\_status\_module --with-http\_flv\_module > –with-http\_ssl\_module --with-http\_gzip\_static\_module > –with-http\_realip\_module --with-ipv6 --without-mail\_pop3\_module > –without-mail\_imap\_module --without-mail\_smtp\_module --with-file-aio > –add-module=/build/buildd/nginx-0.8.52/contrib/nginx-upload-progress-module > > Attachments: > [http://www.ruby-forum.com/attachment/5218/safari.connection.normal.log](http://www.ruby-forum.com/attachment/5218/safari.connection.normal.log) > [http://www.ruby-forum.com/attachment/5219/safari.connection.slow.log](http://www.ruby-forum.com/attachment/5219/safari.connection.slow.log) > [http://www.ruby-forum.com/attachment/5220/safari.connection.slow2.log](http://www.ruby-forum.com/attachment/5220/safari.connection.slow2.log) These logs doesn’t contain full logs for any single request. On the other hand, each file contains parts of _two_ different connection logs. E.g. in slow2.log: 2010/10/18 23:02:48 [debug] 26728#0: \*146 http finalize request: 0, “/index.php?/jobs/” a:1, c:1 2010/10/18 23:03:19 [debug] 26728#0: \*151 http finalize request: 0, “/index.php?/estimates/” a:1, c:1 These are two distinct connections, \*146 and \*151. Each connection itself doesn’t seem to be problematic. Maxim D. ---
**Author:** ![senh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/e47c2d/32.png) [@senh](https://www.ruby-forum.com/u/senh)\ **Post date:** [October 19, 2010, 3:40pm UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688/3 "2010-10-19T15:40:49Z")
It did some further testing and Safari with User-Agent Firefox is working correctly. Only difference I could notice is that in this case Keep-Alive connections are enabled. As a final solution I removed the else condition in /src/http/ngx\_http\_core\_module.c (line 806) that disables keep-alive connections for Safari by default. What’s the reason this is hardcoded by default in Nginx source? Maybe add an option to make this user configurable in the future? Even [apple.com](http://apple.com) is sending Keep-Alive headers. I suppose they know what they are doing. 😉 ---
**Author:** ![senh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/e47c2d/32.png) [@senh](https://www.ruby-forum.com/u/senh)\ **Post date:** [October 19, 2010, 3:50pm UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688/4 "2010-10-19T15:50:25Z")
On Tue, Oct 19, 2010 at 03:40:49PM +0200, Sen Haerens wrote: > It did some further testing and Safari with User-Agent Firefox is > working correctly. Only difference I could notice is that in this case > Keep-Alive connections are enabled. > > As a final solution I removed the else condition in > /src/http/ngx\_http\_core\_module.c (line 806) that disables keep-alive > connections for Safari by default. What’s the reason this is hardcoded > by default in Nginx source? > **[5760 – Safari hangs when uploading files to certain php scripts](https://bugs.webkit.org/show_bug.cgi?id=5760)** – Igor S. > **[Igor Sysoev](http://sysoev.ru/en/)** ---
**Author:** ![senh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/e47c2d/32.png) [@senh](https://www.ruby-forum.com/u/senh)\ **Post date:** [October 19, 2010, 4:00pm UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688/5 "2010-10-19T16:00:59Z")
Igor S. wrote in post #955427: > [5760 – Safari hangs when uploading files to certain php scripts](https://bugs.webkit.org/show_bug.cgi?id=5760) I understand but why is Keep-Alive not only disabled for POST requests then? ---
**Author:** ![senh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/e47c2d/32.png) [@senh](https://www.ruby-forum.com/u/senh)\ **Post date:** [October 19, 2010, 4:06pm UTC](https://www.ruby-forum.com/t/safari-intermittently-hangs-when-loading-fcgi-request/197688/6 "2010-10-19T16:06:49Z")
On Tue, Oct 19, 2010 at 04:00:59PM +0200, Sen Haerens wrote: > Igor S. wrote in post #955427: > > > [5760 – Safari hangs when uploading files to certain php scripts](https://bugs.webkit.org/show_bug.cgi?id=5760) > > I understand but why is Keep-Alive not only disabled for POST requests > then? POST may go on keep-alive connection after GET. – Igor S. > **[Igor Sysoev](http://sysoev.ru/en/)**