Introduction
Let's get started. The 400 Bad Request error is an HTTP status code that indicates an error caused by an invalid valid request. The error message itself comes in several variations, such as HTTP error 400, HTTP arrow 400 Bad Request and Bad Request invalid URL. Different browsers will also show different error messages. Firefox and Safari may even display only a blank page when HTTP400 Bad Request Error happens, which might make it harder for users to identify it.
The error 400 happens when the web server cannot understand a request from your computer. The process works like this: when you try to access your website, your computer will send a request to the web server.
Then the server processes the request and sends the page you want. But sometimes there are situations that make the server unable to understand your request. If this happens, the server will not process the request and will send back the 400 Bad Request error message instead.The common causes of 400 Bad Request errors include corrupted or expired browsers, cache or cookies. Browsers, cookies and cache are used to improve the browsing experience. Cache stores site data like text and images to reduce the number of requests sent to the web server.
This makes the page load faster. Meanwhile, cookies contain the user's session history and preferences to enable a personalized browsing experience. But after some time, cookies may extend and cash can become corrupted.
This may interfere with the request and trigger the 400 Bad Request error. It's a common occurrence on the login pages. The next possible cause is Wrong URL syntax, which means the URL contains invalid characters such as square brackets or double percent symbols.
The third common cause is invalid DNS cache. When you visit a site for the first time, the browser will initiate a DNS lookup. It searches for the name servers and IP addresses associated with the domain name you typed.
The first and simplest action that I recommend is refreshing the page. If that doesn't work, you can try the following methods.
Check the Domain Address
Let's start by double checking the domain addresses to see if there's any mistake.
For example, if the correct domain name is like this one, but you accidentally typed in a present symbol, it will result in a 400 Bad request error. You may also find the domain main addresses use incorrect syntax like double percent symbols.
This happens because the URL is encoded incorrectly. When you encounter this issue, use an encoder or decoder tool like this one from Mayorweb.com.
Clear Browser Cookies
If there are no issues with the URL, but you're still getting the error, let's try clearing the browser's cache and cookies. But before we do that, know that clearing them will find you out from the websites you have visited and reset the settings. It will also take more time to load the websites, since the browser needs to retrieve the content previously stored in the cache.
I'm going to show you how to do that in three different browsers. First google Chrome. Click on the three dots in the top right corner of the window and select Settings. On the left panel, select Privacy and Security and click Clear browsing data.
Select the time frame. I'm going to choose all the time. Then take the cached images and files and cookies and other side data boxes. Hit the Clear Data button and restart the browser to finish the process.
Next is Mozilla Firefox to clear the browser cache and cookies. In this browser, open the hamburger icon at the top right and click History. Choose clear. Recent history. Select the time range to Clear.
I'll choose everything by default. All options under the History section are all selected. For now, let's uncheck the others and go with just cookies and cache. Click the OK button.
Disable Browser Extension
Browser extensions can be very helpful, but they can also cause a bad request error.This is because they may interfere with your computer's request to the Web server, causing the server to interpret the request as invalid. To find out if a browser extension caused this error, to disable all of them if you use Google Chrome, navigate to the Three Dots icon on the top right corner.
Click more Tools, then select Extensions. Click the toggle switch. To turn off an extension, you will have to do that one by one. Unfortunately, there's no select all option after that. Refresh the Web page if it loads normally, one of the extensions is the cost of the 400.
Ad request error. Now you need to identify which extension, so turn on the extensions one by one, refreshing the page each time. If you see the 400 value request error, after you turn one of the extensions, you found the culprit.
Keep it disabled, or better yet, just remove it altogether by clicking the Remove button.
Flush DNS Cache
The steps for flashing your DNS cache will vary depending on your operating system. And if you use Google Chrome, you will also have to flash the browser's DNS cache.
I'll show you how to flash the DNS cache on Windows, Mac OS and Google Chrome. If you use Linux as your operating system, check the article I've linked in the description below. Okay, so the following steps are for Windows six P, seven, Vista eight, eight one or ten.
right click the Windows Start menu and select Search. Type CMD. To find Windows, command prompt and select Run as Administrator, type Ipconfig, Pledge DNS and hit Enter when the process is completed. The command prompt console will show a message saying successfully flash the DNS resolver cache.
Now let's move on to macOS. First, you have to ensure you are using the correct Flushdns command for your OS version. To check your Mac OS version, click the apple icon. Then about this Mac once you have found your macOS version, open the command terminal by pressing the F four key and entering Terminal in the Spotlight search field.
After that, run the command for your macOS version by inserting it in the command terminal and hitting Enter. I've listed commands for the various macOS versions in the description below, so you just need to copy it from there.
Sometimes you may also see a prompt asking you for your admin password. Simply insert your password, click Enter again, and you are all set. Google Chrome actually stores a separate DNS cache from the operating system.
That's why you have to flush its DNS cache as well, especially if it's your old browser. To do so, open the browser and enter this line into the URL bar. You can also copy it from the video description.
After that, click the Clear Host cache button and that's it.
Check File Size
Websites usually have a different upload limit, so check if the file you want to upload fits it. If the website doesn't mention the file size limit, try to upload a small size to check whether it's sized, causing the error.
If it works, you should resize the file you originally wanted to upload. You can use free online compression tools so you don't have to install yet another software on your computer. Short Pixel is great for optimizing images, while high PDF will help you resize PDFs, NMedia, IO, video and audio files.
I recommend checking them out. .Quality after compression to make sure it hasn't been negatively affected. And that's it. Now we know how to troubleshoot the 400 Bad Request error.