{"id":36888,"date":"2021-09-23T10:49:32","date_gmt":"2021-09-23T10:49:32","guid":{"rendered":"\/tutorials\/?p=36888"},"modified":"2026-03-09T19:19:05","modified_gmt":"2026-03-09T19:19:05","slug":"how-to-fix-400-bad-request-error","status":"publish","type":"post","link":"\/ng\/tutorials\/how-to-fix-400-bad-request-error","title":{"rendered":"400 Bad Request error: What it means & how to fix it"},"content":{"rendered":"

A 400 Bad Request is an HTTP error that means your browser sent a request that the server couldn’t understand or process. Most of these errors happen because of simple issues, like an invalid URL, outdated cache files and cookies, or an uploaded file that exceeds the server’s limits.<\/p>

The good news is that you can usually solve them in just a few minutes with some basic troubleshooting steps:<\/p>

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  1. Use a fast network connection.<\/li>\n\n\n\n
  2. Make sure the URL is correct.<\/li>\n\n\n\n
  3. Clear browser cache and cookies.<\/li>\n\n\n\n
  4. Turn off browser extensions.<\/li>\n\n\n\n
  5. Flush the DNS cache on your computer.<\/li>\n\n\n\n
  6. Reduce the files you want to upload.<\/li>\n<\/ol>

    If you’re a website owner, you also need to perform regular audits to keep your site free from any 4XX errors.<\/p>

    Here’s how to get your website loading again and what to do if the standard fixes don’t work.<\/p>

    \n\n\n\n<\/p>

    What does a 400 Bad Request error mean?<\/h2>

    A 400 Bad Request error means the server received your request but couldn’t process it because something was wrong with how it was formatted or what it contained. This is one of the HTTP 4XX status codes<\/a> that indicates a client-side problem.<\/p>

    What is a 400 Bad Request in simple terms? Think of it like sending a letter with an incomplete address. The post office gets your letter, but can’t deliver it because they can’t figure out where to send it.<\/p>

    Here are the main causes:<\/p>

    Cause<\/strong><\/td>Description<\/strong><\/td><\/tr>
    URL syntax errors<\/td>Typos, extra spaces, or missing characters like = or & in the web address.<\/td><\/tr>
    Browser issues<\/td>Corrupted cache files, outdated cookies, or conflicting extensions.<\/td><\/tr>
    Outdated DNS cache<\/td>Your computer has old website address information that doesn’t match current records.<\/td><\/tr>
    File size too large<\/td>Uploaded files, images, or cookie data exceed the server’s size limits.<\/td><\/tr>
    Malformed request headers<\/td>Browser sends incorrectly formatted information the server can’t read.<\/td><\/tr>
    Invalid characters<\/td>Special symbols or encoding that the server doesn’t recognize.<\/td><\/tr><\/tbody><\/table><\/figure>

    The problem is that most of the time, you will see a generic error message without any context, so it’s hard to know what exactly went wrong.<\/p>

    Here’s what a 400 Bad Request error looks in Google Chrome:<\/p>

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