The 400 Bad Request error is an HTTP status code, which means that the request you send to the
website server, usually a simple request to load a web page, is somehow incorrect or damaged, and the server cannot understand it.
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The 400 Bad Request error is usually caused by typing or pasting the wrong URL in the address window, but there are other relatively common reasons.
The 400 bad request error is displayed differently on different websites, so you may see the content in the short list below instead of just "400" or other simple variations:
400 Bad request Bad request. Your browser sent a request that this
server cannot understand. Bad request-Invalid URL HTTP error 400-Bad request Bad request: Error 400 HTTP error 400. The requested host name is invalid. 400-Bad request. The server cannot understand the request due to a syntax error. The customer should not repeat the request without modification.
The 400 Bad Request error is displayed in the Internet Web browser window, just like a web page. You can see 400 Bad Request errors in any operating system and any browser, such errors.
In Internet Explorer, the webpage cannot be found message means 400 Bad Request error. The title bar of IE will say HTTP 400 Bad Request or something similar.
Windows Update can also report HTTP 400 errors, but they are displayed as error code 0x80244016 or display message WU_E_PT_HTTP_STATUS_BAD_REQUEST.
A 400 error reported for a link in a Microsoft Office application usually appears as the remote
server returned an error: (400) Bad Request. The message in a small pop-up window.
Note:
Web servers running Microsoft IIS usually provide more specific information about the cause of the 400 Bad Request error by adding a number after the number 400, such as in HTTP Error 400.1-Bad Request, which means invalid target header. You can view the full list here.
How to fix 400 bad request error
Check for errors in the URL. The most common reason for the 400 Bad Request error is that the URL is entered incorrectly or the clicked link points to a badly formatted URL, which contains specific types of errors, such as grammatical problems.
Important: If you receive a 400 Bad Request error, this is most likely the problem. Specifically, check for extra (usually not allowed) characters in the URL, such as percent characters. Although there are perfectly valid uses for things like the% character, you usually won't find it in a standard URL.
Clear your browser’s cookies, especially when you receive a bad request from Google services. Many sites report 400 errors when the cookie it is reading is damaged or too old.
Clear the DNS cache. If it is caused by outdated DNS records stored on your computer, you should fix the 400 Bad Request error. Do this in Windows by executing ipconfig / flushdns from the command prompt window.
Important: This is different from clearing the browser's cache.
Clear the browser's cache. The cached but corrupted copy of the webpage you are trying to access may be the source of the problem showing the 400 error. Clearing the cache is unlikely to solve most 400 bad requests, but it is quick and easy and worth trying.
Although this is not a common fix, try to troubleshoot the problem as a 504 Gateway Timeout problem, even if the problem is reported as 400 Bad Request.
In some relatively rare cases, two
servers may take a long time to communicate (a gateway timeout problem) but will incorrectly, or at least unhelpfully report the problem as 400 Bad Request.
If you upload a file to the website when you see an error, it may be that the 400 Bad Request error is because the file is too large and the server rejected it.
If the 400 error occurs on almost every website you visit, the problem is most likely your computer or internet connection. Run an Internet speed test and check with your ISP to make sure everything is configured correctly.
Contact the website hosting the page directly. There may actually be a 400 Bad Request error. No, there is something wrong with your ending, but it is something they need to fix. In this case, it would be very helpful to let them know.
Please refer to our website contact information list for how to contact multiple popular websites. Most websites have social network connections, sometimes even phone numbers and email addresses
Tip: If the entire site has a 400 Bad Request error, search for Twitter #websitedown is usually useful, such as #facebookdown or #gmaildown. It will certainly not make any contribution to solving this problem, but at least you will know that you are not alone!
If nothing above works and you are sure that the problem is not on your computer, then you just need to check back later.
Since the problem is not yours, please revisit the page or website periodically until it recovers.
Are there 400 more errors?
If you follow the above suggestions but still receive a 400 Bad Request error when trying to open a certain webpage or website, please refer to Get more help for information about contacting me via social networks or via email, post on technical support Forum and so on.
Be sure to let me know if the error is an HTTP 400 error and what steps you have taken to resolve the problem.
Errors like 400 Bad Request
There are many other browser errors, client-side errors, etc., at least to some extent related to the 400 Bad Request error. Some of them include 401 Unauthorized, 403 Forbidden, 404 Not Found and 408 Request Timeout.
The server-side HTTP status code also exists and always replaces 4 with 5. You can see all of these in our list of HTTP status code errors.
