We all are familiar with HTTP error 400. Here we don’t need to explain how much we get frowned by this error, especially when we are trying to surf our favorite site. 

Internet errors can vary in many different types. Apart from error 400, error 502 can also add sour to your internet experience, and you want to avoid it. You can learn more about bad gateway 502 error from here.

HTTP error 400 error usually occurs in case a document or page you’ve requested can’t be found. You also may see an error 400 with a wrong request message. This type of error can be trickier, but you don’t have to worry anymore.

In this blog, we will try to dig deep into some of the common reasons behind error 400, ways you can fix it, and steps you can take to prevent happening during future internet browsing.

What is HTTP error 400?

Of all the errors you may encounter on the internet, this error is the most common that happens at the user’s end. We are certainly not implying here that server admins don’t have to worry about it. They do. But most of the time, the request is terrible from the beginning, and the website can’t make sense of it. So instead of trying to fill the request, the server just shows a 400.

So you see this error, now what?

Luckily, there are some things you can do to push the request so that it gets carried out after the server after processing. Let’s look at some of the causes, and then we will see how you can fix them.

Browser Cache and Cookies Issues.

We’ve said it before, and we will say it again. Clearing your web browser cache is like turning HTTP errors off and back on. This also applies to almost every other internet error.

But here is a bit of unluck, this is not a permanent solution because clearing cache is not going to fix everything. 

However, if you are facing some sort of corruption somewhere, an expired cookie or something unable to parse and locked up, clearing your browser cache can be very helpful.

Often, error 400 gets returned to form submission or log in. If you are sending encrypted and secured packets, there is a chance that something might get wrong during the whole process. You can cure this by simply refreshing the page most of the time. If you still don’t get to your page, we will recommend you clear your browser cache.

You can also bypass your browser cache when receiving HTTP error 400 by pressing Ctrl/CMD+Shift+R on your keyboard. This might help to push your request, and if not, you can move to other fixes.

Checking URLs.

URLs are not just simply some scrambled alphabets and numerals resting on your browser’s screen. But, they are the address of the webpage you are trying to access.

A URL drives traffic to your site. But is the traffic enough? Online businesses with a higher bounce rate can struggle a lot to make sales. You can learn more about the bounce rate from here.

Now imagine, what if someone sets for a destination with a wrong address. He will end up somewhere else.

Well, in the case of the internet, with errors in your webpage address or URL, you will land on error 404.

One of the primary causes of 400 is an error in the URL. It must be kept in mind that this error in the URL is very different from the typical error leading to 404. And here is it how.

A typo can cause error 404, but error 400 is caused by an illegal character that isn’t part of the syntax expected by the server.

To tackle this, you have to ensure that when you get HTTP error 400, you haven’t changed the URL in any way. Check for any strange character that you shouldn’t be there. Make sure the URL is exactly as it is meant to be.

Gokautomaton Gids, a client of ours, had an issue of this sort. Their users were complaining about one particular URL always giving the 400 error and the whole fiasco was caused by a “%20” syntax placed in the main URL.

If you concur 400, follow the primary link and check it’s syntax.

Is it your Add-ons and Extension?

Add-ons and Extensions are cool. They can be of great help while performing tasks on the internet. But are you sure these Add-ons are not causing 400?

You should make it sure that no third-party software is causing the error. It is much like WordPress debugging. 

Debugging with WordPress is fairly straightforward. WordPress has completely revolutionized the way we use to design our sites. And with these themes, you can add more charm to your site.

Similarly, checking your extension is fairly simple too. If you run any add-ons or extensions on your browser, you should disable them individually to see if anyone of them is causing the error.

Hence you don’t know which one is the culprit, so you can not disable them all. And once you have found the extension that is causing the error to pop up, you can look for support, disable it, or you can check the extension marketplace to ensure that you have an updated version of the add-on.

Erase your DNS Cache.

You can not forget about your DNS Caches. Flushing your DNS caches act in the same way as clearing your browser cache. Though they are completely separate, the concept is the same.

Your computer saves DNS information for the site so that the sites load quicker upon revisits. But sometimes that old information of the site can conflict with the site’s most recent info. And you get an error 404.

Fixing the issue with the DNS cache is quite simple. In Windows, you need to open the Command Prompt.

You can type cmd in the search to open the prompt. And when you get to the prompt type ipconfig /flushdns (with space)

And if you are a Mac user, it’s very similar. 

All you have to do is to search for terminal and type sudo killall -HUP mDNSResponder.  And if that doesn’t work, try sudo discoveryutil udnsflushcaches.

Wrapping Up

HTTP error 400 is quite common among internet users, and by some simple solution, one can fix it. If you still get the errors even after the solutions mentioned above, then it’s the time to involve the host. 

They have a lot more access and information than you do.