How to Fix HTTP Error 400 Bad Request Easily - MiniTool

Is there 400 wrong requests when visiting the website? This article will explain the 400 error request in detail, analyze the causes, and provide solutions.

What is a 400 Error Request?

400 Error Requests are common errors in various browsers. When the server cannot process the request sent by the client, such as request syntax error, request message framework invalid, or request routing spoofing, an HTTP 400 error will be returned.

Different browsers display differently: Google Chrome and Microsoft Edge will directly display error messages, while Safari and Firefox may only display blank pages. In addition, the 400 error has the following variants:

• HTTP Error 400
• HTTP Error 400 – Error Request
• HTTP Status 400 – Error Request
• HTTP Error 400. Invalid request hostname
• 400 Error Request
• 400 Error request. Request header or cookie is too large
• Error Request – Error 400
• Error request – invalid URL

Common Causes of 400 Bad Requests

A 400 erroneous request may be caused by:

• URL syntax error. For example, URLs are misspelled; URLs contain illegal characters such as "{" etc.
• Browser cache and cookies are corrupted. Corrupted browser cache files or expired/corrupted browser cookies can cause corruption of authentication data, resulting in the inability to successfully verify the user and the request is denied.
• DNS cache error. The locally stored DNS data is out of sync with the registered DNS information, resulting in the name resolution process being unable to be completed and the request is denied.
• The file size is too large. Some servers have limitations on file size, and uploading too large files may cause 400 errors.
• Server error. A problem with the server itself may also cause a 400 error.

How to resolve 400 Error Requests

After understanding the reasons for the 400 wrong requests, the following measures can be taken to resolve the problem:

1. Check the URL

Double-check the domain name spelling. If the URL contains a directory path, file name, or query string, be aware of special symbols (such as the hyphen "-" or the percent sign "%") to ensure that these special characters are correctly encoded and are legal URL characters. If necessary, you can access the website by searching for the title or keyword of the article or page.

2. Clear browser cache and cookies

Browser caches include website files (such as text and images), and cookies store user session history and preferences, which can speed up page loading and improve browsing experience. But if they are corrupted and cause 400 bad requests, they need to be cleared. Take Google Chrome as an example:

1. Click the three dot icons in the upper right corner of Google Chrome and select Settings .
2. Go to the Privacy and Security tab and click Clear browsing data .
3. Make sure all items are selected and click Clear Data .

3. Disable browser extensions

Some extensions may interfere with requests sent to the web server, resulting in 400 erroneous requests. Disabling browser extensions may resolve this issue. In Google Chrome, click the three dot icon in the upper right corner and select More Tools > Extensions to disable extensions.

4. Check file size

If a 400 error occurs when trying to upload a file to a website and the file size exceeds the server's file size limit, you can try uploading a smaller file. If the problem is solved, you may need to compress the file or split it into smaller files.

5. Clear DNS cache

When you first visit a website, the system searches for the name server and IP address associated with the domain name (Web server) and stores this information in the DNS cache. When you visit the website again, you can reduce the DNS lookup process and speed up the website loading. However, if the DNS cache is corrupted, 400 erroneous requests may occur. In this case, the DNS cache can be cleared. On a Windows computer, just open a command prompt and execute the command " ipconfig /flushdns ".

Conclusion

Hope the above method can help you solve the 400 error request problem.

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