How to Fix 413 Request Entity Too Large Error on NGINX

You may have faced or heard of the issue when users trying to upload 1.5MB+ size image file using nginx reverse proxy, they are getting the following error on screen:

413 Request Entity Too Large

 

In order to fix this issue we will need to configure both nginx and php to allow upload size:

Nginx configuration

The client_max_body_size directive assigns the maximum accepted body size of client request, indicated by the line Content-Length in the header of request. If size is greater the given one, then the client gets the error “Request Entity Too Large” (413). To fix this issue edit your nginx.conf. Open the Terminal or login to the remote server using ssh client. Type the following command to edit your nginx.conf using a text editor such as vi or joe:

# vi /etc/nginx/nginx.conf
OR
# vi /usr/local/nginx/conf/nginx.conf
Add the following line to http or server or location context to increase the size limit in nginx.conf, enter:

# set client body size to 2M #
client_max_body_size 2M;

Save and close the file.  Reload server:
# /usr/local/nginx/sbin/nginx -s reload
OR
# /sbin/nginx -s reload
OR use the following on RHEL/CentOS/Debian/Ubuntu Linux:

# service nginx reload

PHP configuration

Your php installation also put limits on upload file size. Edit php.ini and set the following directives

;This sets the maximum amount of memory in bytes that a script is allowed to allocate
memory_limit = 32M
 
;The maximum size of an uploaded file.
upload_max_filesize = 2M
 
;Sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than upload_max_filesize
post_max_size = 3M

Save and close the file. Make sure you reload/restart back-end apache or nginx web server as per your setup for change to take effect

 

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