How To Fix 414 Request URI Too Large in Apache

If you request a very large URL in Apache web server, then it may give “414 Request URI too large” error message. By default, Apache supports URLs with up to 8177 characters, but sometime users even get error with ~4000 characters in URL. In this article we will look at how to fix 414 request URI too large error in Apache.


How To Fix 414 Request URI Too Large in Apache

By default, Apache server supports up to 8177 characters in a URL. However, if you need to request large URLs, or are getting errors with smaller URLs itself, then you need to increase the request size limit in Apache.

You can do this by setting LimitRequestLine and LimitRequestFieldSize directives.


1. Open Apache Configuration File

Apache configuration file is located at one of the following locations, depending on your Linux distribution.

  • /etc/apache2/httpd.conf
  • /etc/apache2/apache2.conf
  • /etc/httpd/httpd.conf
  • /etc/httpd/conf/httpd.conf

Open terminal and run the following command to open Apache configuration page.

$ sudo vi /etc/httpd/conf/httpd.conf

If you make changes in Apache server configuration file, it will be applicable for all websites/domains that you run on your Apache web server.

Also read : How to Enable Apache Server Status Dashboard


Apache Restrict Access by IP in Virtual Host

If you are running multiple websites on Apache server, using virtual host, then open the virtual host configuration file of the website (e.g www.website.com) for which you want to deny access to IP. Let’s say your virtual host configuration file is located at /etc/apache2/sites-enabled/website.conf

$ sudo vi /etc/apache2/sites-enabled/website.conf

Also read : Apache Restrict Access to URL by IP


2. Increase URI limit

To fix 414 Request URI too large error, you need to set LimitRequestLine directive.

If you want to increase URL limit to 10000 characters (bytes), add the following lines to your server configuration or virtual host file.

LimitRequestLine 10000

If you also want to increase maximum header length supported by Apache to 4000 characters, then add the following line to server configuration or virtual host file.

LimitRequestFieldSize 4000

Basically, you need to specify the required number of bytes after LimitRequestLine and LineRequestFieldSize directives.

Also read : How to Enable HTTP2 in Apache


3. Restart Apache web server

Restart Apache web server to apply changes.

# service httpd restart
OR 
# systemctl restart httpd
OR
# sudo service apache2 restart

Now when a user tries to request a long URL they will not get “414 Request URI too long” error.

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