Web Browsers - How to Fix a "Bad Request" Error

This document describes what to do if you receive a 400 Bad Request error message upon loading a website.

Problem

When you attempt to access a website, you may sometimes instead receive a "Bad Request" error message where the website content should have loaded. This error often contains the number "400" and may include additional text, such as "Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit."

Solution

First, check the website URL you entered to make sure it is correct. If the web address appears to be entered correctly, then the issue can usually be resolved by clearing your browser's cache and cookies.

For instructions on performing these steps, click on the appropriate link for the web browser you are using:

Windows

Browser Document Link
Internet Explorer 6
Internet Explorer 6
Internet Explorer 6 - Windows
Internet Explorer 7
Internet Explorer 7
Internet Explorer 7 - Windows
Internet Explorer 8
Internet Explorer 8
Internet Explorer 8 - Windows
Internet Explorer 9 and
Internet Explorer 9-11
Internet Explorer 9, 10, & 11 - Windows
Edge
Edge
Edge - Windows
Firefox 3.5
Firefox 3.5
Firefox 3.5 - Windows
Firefox 4+
Firefox
Firefox - Windows
Chrome
Chrome
Chrome - Windows
Opera
Opera
Opera - Windows
Safari
Safari
Safari - Windows

Mac OS X

Browser Document Link
firefox_icon.png
Firefox 3.5 - 20
Firefox 3.5 - 20 - Mac
Firefox 21+
Firefox 21+
Firefox 21+ - Mac
Chrome
Chrome
Chrome - Mac
Opera 10.50
Opera 10.50
Opera 10.50 - Mac
Opera 28
Opera 28
Opera 28 - Mac
safari_icon.png
Safari 5
Safari 5 (and older) - Mac
safari_icon.png
Safari 5.1 - 7.9
Safari 5.1-7.9 - Mac
safari_icon.png
Safari 8.0+
Safari 8.0+ - Mac

Mobile Operating Systems

Operating System Document Link
Android Icon
Android
Android - Chrome
iOS Icon
iOS
Safari - iOS
webOS Icon
webOS
Web - webOS
Windows Phone Icon
Windows Phone
Internet Explorer - Windows Phone




Keywords:mozilla firefox ff internet explorer ie google chrome safari website http "400 bad request" "Your browser sent a request that this server could not understand." "Size of a request header field exceeds server limit." cookies cache /n   Doc ID:47897
Owner:Leah S.Group:DoIT Help Desk
Created:2015-03-02 17:45 CDTUpdated:2015-05-29 16:49 CDT
Sites:DoIT Help Desk, DoIT Tech Store
Feedback:  49   97