How To Fix The HTTP Error 400 For WordPress Websites

How To Fix The HTTP Error 400 For WordPress Websites

As you browse through internet web pages, it is quite common to encounter HTTP errors. A common user may not understand the actual reason behind a 502 error code or error 400. They may simply choose to exit the page or try refreshing. 

But as a WordPress developer, you need to make sure these errors appear as much less as possible so that your visitors don’t get turned off from your website. This article will give you information on fixing the HTTP 400 error, which implies a bad request. 

What Is HTTP 400 Error?

HTTP 400 error status code represents a situation where the server is not able to process the request. This could be because of malformed request format, faulty RAM, wrong plugins, malware, corrupt cookies, corrupt DLL files, incorrect security settings, and so on.

 The HTTP error 400 is usually displayed as “400: Bad Request error” or in similar terms as customized by the webserver. Sometimes the error message may not be displayed, and the browser will simply show a blank screen with the status code of 400. 

Either way, this error message gives little information into the actual root cause of the issue. Hence fixing this issue might demand a trial and error approach. You can try out the fixes one by one and see what is causing the error. 

Fixing The HTTP 400 Error?

Wondering how to fix error? Check out the ideas below.

Refresh The Page

In most cases, a simple refresh can help reset expired cookies and corrupted cache data and form a valid request. 

Check The URL

Any spelling mistakes, invalid characters in the URL can cause 400 error. Carefully check the URL you have entered and make sure it has the valid syntax and path. Content creators may add incorrect URLs as links on the webpage. 

Make sure the links to your WordPress blogs and pages are correct and valid. Sometimes links may also be constructed from JavaScript coding. Test your site for the correctness of the related code to make sure your users don’t get to see a 400 error code

Clear All Cookies

Corrupted cookies can easily cause a 400 error. It can be quite difficult to comb through all your stored cookies to find the exact corrupted or expired cookie. So for a simple fix, clear all your cookies by accessing browser settings. 

You can also clear browser cache under the same settings to fix the 400 error. Speaking from personal experience, we were facing 400 error while trying to access, and then we deleted our browser’s cookies to fix the error, and guess what – it worked.

Steps to deleting cookies are:

  • Access browser settings
  • Search for cookies or find them under the content settings section. 
  • Click on the button ‘All cookies and site data.’ 
  • A list of all stored cookies will be shown from which you can choose to delete the cookies as you need. 

Use Registry Cleaner 

Corrupt registry keys and faulty RAM can also cause 400 error. To fix the error, you have to repair each of your Windows registry entries manually. An easier alternative would be to download a proper registry cleaning tool and use it to repair your registry. Some popular cleaners you can check out are Ccleaner, Wise Registry Cleaner, Comodo System Utilities, and more. 

Increase File Size Limit 

At times, the server may not be able to handle the incoming request data due to the huge data size. Most servers pose a restriction on the file size for requests. The following methods can maximize this:

  • Increase the file size limit in the wp-config.php file. The line you should be looking for is ‘define(WP_MEMORY_LIMIT,’ 64M). Update the 64 M size to a larger 128 or 256 M as required by the web application. 
  • Modify the .htaccess file to increase the file size limit. 

Flush DNS Cache

Flushing the DNS cache works the same way as clearing your browser cookies and cache. DNS stands for a domain name server, which translates the domain names into the IP addresses used to access a website. For rapid access, your system will store a local copy of DNS entries, which, if outdated and not synced properly, may contain corrupt values. This could lead to a wrong request and, subsequently, the 400 error. 

The fix for this issue is straight forward. You have to flush your DNS and try accessing the website again. 

For Windows system, the steps are:

  • Open command prompt
  • Enter the command ‘ipconfig/flushdns.’ Open command prompt as admin if you do not have the right to operate. 

For Mac systems:

  • Open terminal 
  • Enter the command ‘sudo killall -HUP mDNSResponder’ or sudo disoveryutil udnsflushcaches. 

For Linux systems:

Use, sudo systems-resolve –flushcaches


sudo /etc/init.d/dns-clean start

For clearing the DNS cache in chrome browser:

  • Enter ‘chrome://net-internals/#dns’ in the address bar. 
  • Click on the ‘clear host cache’ button. 

Uninstall Plugins and Third-Party Code

Sometimes plugins may insert invalid characters and data into the code causing the error. To fix this, you can try to identify the problematic plugin by uninstalling the plugins one by one and checking the result. Once you have identified the plugin that causes the error, you can either update it with the latest version or uninstall it to fix the issue. 

Contact Your Webhost

If none of the above methods proved to be a cure to the 400 error, it is time to contact your web host. They have better resources and information to help you fix the issue and should be able to provide you with a solution.

Related Posts

Copyright © 2020 Blog Clock. All Rights Reserved.