The "413 - Request Entity Too Large" error in Nginx is usually caused by a client trying to upload a file that exceeds the maximum allowed size. This error can occur when the client attempts to upload a file using the HTTP POST method, and the file is larger than the maximum allowed size specified in the Nginx configuration.
To fix this error, you can increase the maximum allowed size for file uploads in the Nginx configuration. The maximum allowed size is specified in the client_max_body_size directive in the Nginx configuration file (usually /etc/nginx/nginx.conf).
To increase the maximum allowed size for file uploads, you can add or modify the client_max_body_size directive in the http block of the Nginx configuration file. For example, to increase the maximum allowed size to 50 megabytes, you can use the following configuration:
http {
client_max_body_size 50m;
...
}
This will increase the maximum allowed size for file uploads to 50 megabytes.
Keep in mind that increasing the maximum allowed size for file uploads may affect the performance of your server, as it will take longer to process larger file uploads. You should choose a value for the client_max_body_size directive that is appropriate for your server's resources and needs.
Once you have modified the Nginx configuration, you will need to reload the Nginx server to apply the changes. You can do this by using the nginx -s reload command.
For more information about the client_max_body_size directive and other Nginx directives, you can consult the Nginx documentation or use the man nginx command to see the manual page.