How to Fix the HTTP Error 400 for WordPress Websites

How to Fix the HTTP Error 400 for WordPress Websites

You are probably familiar with 508 Error. It is mainly caused when your resource limit is reached, and you can’t access a website. But what about HTTP Error 400, where you are shown a lousy request message?

This one is a bit trickier, but not anything to worry about. Here in this blog, we will try to dive into some common reasons an HTTP Error 400 can occur, ways to fix it when it does, and measures you can take to dodge it from happening.

What is the HTTP Error 400

Of all the errors people experience while browsing on the internet, this one is the most common error that happens on the user’s end. That’s not to say that server admins and WordPress developers don’t have to worry about it. They do. 

But in many scenarios, the request is flawed from the user’s end, and the website is unable to make sense of it. So without even trying to fulfill it, it shows you a 400.

But you don’t have to worry about it anymore. Luckily, there are some things you can do to push the request through to the server processes and get it processed. Let’s have a look at some of the cases and how you can fix them.

Browser Cache and Cookies Issues.

We have said it earlier, and we will repeat it. Clearing your browser cache is “turn it off, then back off” of every HTTP error. Or most Internet errors.

Unfortunately, clearing your browser’s cache and cookies is not going to fix everything. However, if there’s been a corruption somewhere, an expired cookie, or only something clogged up and unable to parse, clearing your browser cache might be able to make it work.

Many a time, a 400 error will get returned on login or form submission. If you are sending encrypted and secure packets, something might go wrong during the process. Sometimes a simple refresh can do your work, but other times you need a lot more than a simple refresh.

You can also try to bypass the cache when receiving an HTTP Error 400 by pressing CTRL/CMD-Shift-R while being on the error screen. We are hopeful that this will push your request through. If not, then we recommend moving on to the other fixes. 

Check Your URLs

One of the primary causes of an HTTP Error 400 is an error in the URL. It’s different from the type of typo that results in a 404, but an illegal character isn’t part of the server’s expected syntax.

Let’s take a simple example. When working with a UTM campaign, you can use codes like %20 to insert different characters (%20 is used to insert a space).

A standard URL will work as soon as you put it down in the search bar. However, errors in a syntax like putting a % or %20 in the URL’s central part (the part before the “?” that indicates the query strings in the URL), the server just has no idea of what you are trying to look for.

The server will not understand the address because the URL structure doesn’t accept the inappropriate character you are using in your URL.

You have to make sure that when you get an HTTP Error 400, you are not inserting an URL that is malformed in any way. The URL you are trying to reach is correctly typed in the address bar. 

This is most likely to happen on URLs that you click, so if you follow a link and get an HTTP Error 400, check the primary URL for any character you think should not be the part of the URL.

Check Browser Add-ons and Extensions

Have you ever done WordPress debugging? If you have, this step will be a piece of cake for you. It’s much like debugging in WordPress; you have to make sure that any third-party software isn’t causing it. 

If you are running any browser extension or add-ons, it’s an excellent idea to disable them one-by-one to see if one of them is causing the error to pop-up.

Although you can disable it all at once, you will not recognize the corrupted one. So we suggest checking them individually. If you reload the page and not get a 400, then check the extensions marketplace to ensure that it’s updated to the most recent version or just try to learn without the add-on for a while.

File Size Too Large

This is a huge issue faced by WordPress users, just like Guns and Resslot had in the early times. They had been invariably coming across an HTTP Error when they tried to upload a file. This fixed their issue, and so should it do for you. 

This doesn’t just happen with WordPress, but with WordPress, it’s a swift fix. To ensure that the HTTP Error 400 you face is based on file size, try uploading a smaller file to the server. 

If you see it going through, then there’s a higher chance that the file size limit needs to be increased. Also, try your luck with logging out and back in to fix a 400 based on uploads.

In your wp-config.php file, you should find a line that looks something like this: define(‘WP_MEMORY_LIMIT,’’64M’);

If you don’t see it anywhere, you can copy/paste this one directly above the line that reads /* That’s all, stop editing! Happy blogging. */. Then adjust the 64M to 128M or 256M. This will change the maximum file upload size for your WordPress site.

Flush Your DNS Setting

Flushing your DNS settings can help in the same way as clearing your browser’s cache and deleting cookies helps. Although both are entirely separate from each other, the concept is the same. 

It’s a straightforward fix; you just need to open Command Prompt in the Windows by typing cmd in the search.

When you get to the prompt, just type in ipconfig /flushdns (with space). And that might have fixed your HTTP error 400.

If you’re on Mac, it’s very similar. Your search for the terminal and enter sudo killall -HUP mDNSResponder. If that doesn’t work, try “sudo discoveryutil udnsflushcaches.”

End Words

Dealing with Web errors is not that hard, especially when you know exactly how to diagnose and remove it. We hope you found the solution to your HTTP Error 400. Good Luck!