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How to add the HSTS header only for HTTPS requests on Nginx

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HTTP Strict Transport Security is a mechanism through which web servers declare themselves to be accessible only over secure connections (HTTPS). This mechanism is implemented by configuring the web server to send a HSTS header in its responses. A typical HSTS header looks like the following:

Strict-Transport-Security: max-age=31536000; includeSubDomains

The RFC standard for HTTP Strict Transport Security – RFC6797 specifies under Section 7.2 that a web server should not include this header in plain-text HTTP responses.Continue Reading…

How to fix connect() to php5-fpm.sock failed (13: Permission denied) while connecting to upstream Nginx error

Web Servers 2 Comments

I encountered this problem after updating PHP to 5.5.12. I use Nginx with PHP5 FPM and after the updating PHP I was seeing 502 Gateway Error pages. Nginx’s error log file (/var/log/nginx/error.log) had the following in it:

2014/05/08 06:22:24 [crit] 24538#0: *292759 connect() to unix:/var/run/php5-fpm.sock failed (13: Permission denied) while connecting to upstream, client: 1.1.1.1, server: websistent.com, request: "GET /wordpress-custom-403-401-error-page/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "websistent.com"

It was clear that Nginx couldn’t access PHP FPM’s socket file due to insufficient permissions. But everything was working fine till I updated PHP so something had changed in version 5.5.12.Continue Reading…

Fix the client intended to send too large body nginx error

Web Servers 24 Comments

I recently encountered this error on this WordPress installation running on nginx webserver. I tried to upload a file of size 1.14MB for the article download vmnetcfg.exe when WordPress displayed “HTTP error” in red. I thought it was a problem with either PHP’s max_execution_time or max_upload_filesize directives, but modifying them did not solve the problem. Taking a look at the PHP error log I couldn’t find anything helpful. Finally I saw nginx’s error log which contained this error.Continue Reading…

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