Topics Map > OS and Desktop Applications > Applications > Browsers

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

Problem

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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.'

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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:

Desktop Web Browsers

BrowserWindows Document LinkmacOS Document Link

Google Chrome
Chrome (Win) - Clearing Cache and CookiesChrome (Mac) - Clearing Cache and Cookies

Firefox
Firefox 57+ (Win) - Clearing Cache and CookiesFirefox 21+ (Mac) - Clearing Cache and Cookies

Safari
Safari (Win) - Clearing Cache and CookiesSafari 10.0.1+ (Mac) - Clearing Cache and Cookies

Internet Explorer 9, 10, & 11
Internet Explorer 9, 10 and 11 (Win) - Clearing Cache and CookiesNone

Microsoft Edge
Edge (Win) - Clearing Cache and CookiesNone

Opera
Opera (Win) - Clearing Cache and CookiesOpera 28.0 (Mac) - Clearing Cache and Cookies

New Microsoft Edge
New Edge (Win) - Clearing Cache and CookiesNone
Bad

Mobile Web Browsers

Operating SystemDocument Link

Android
Android (Jellybean) - Clearing Cache and Cookies

iOS
iOS - Clearing Cache and Cookies

webOS
HP webOS 2.x - Clearing Cache and Cookies

Windows Phone
Internet Explorer (Windows Phone) - Clearing Cache and Cookies

Legacy Versions

Windows

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BrowserDocument Link

Internet Explorer 6
Internet Explorer 6 (Win) - Clearing Cache and Cookies

Internet Explorer 7
Internet Explorer 7 (Win) - Clearing Cache and Cookies

Internet Explorer 8
Internet Explorer 8 (Win) - Clearing Cache and Cookies

Firefox 3.5
Firefox 3.5 (Win) - Clearing Cache and Cookies

MacOS

BrowserDocument Link

Firefox 3.5 - 20
Firefox 3.5 - 20 (Mac) - Clearing Cache and Cookies

Opera 10.50
Opera 10.50+ (Mac) - Clearing Cache and Cookies

Safari 5
Safari 5 (Mac) - Clearing Cache and Cookies

Safari 5.1 - 7.9
Safari 5.1 - 7.9 (Mac) - Clearing Cache and Cookies

Safari 8.0+
Safari 8.0 - 10.0 (Mac) - Clearing Cache and Cookies

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See Also:


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 '404 bad request' query /n 400 youtubeSuggest keywordsDoc ID:47897
Owner:Help Desk KB Team .Group:DoIT Help Desk
Created:2015-03-02 16:45 CSTUpdated:2020-08-13 17:22 CST
Sites:DoIT Help Desk, DoIT Tech Store
Feedback:182272CommentSuggest a new document

In theory, you should have to install Mountain Lion only once, or never if your Mac came with Mountain Lion preinstalled. And in a perfect world, that would be the case. But you might find occasions when you have to install/reinstall it, such as

  • If you get a Mac that didn’t come with OS X Mountain Lion preinstalled

  • If you have a catastrophic hard-drive crash that requires you to initialize (format) or replace your boot drive

  • If you buy an external hard drive and want it to be capable of being your Mac’s startup disk (that is, a bootable disk)

  • If you replace your internal hard drive with a larger, faster, or solid state drive

  • If any essential OS X files become damaged or corrupted, or are deleted or renamed

The following instructions do double duty: They’re what you do to install OS X for the first time on a Mac, and they’re also what you do if something really bad happens to the copy of OS X that you boot your Mac from. The instructions offered here describe both the process for installing and the process for reinstalling OS X.

Here’s how to install (or reinstall) OS X, step by step:

  1. Boot from your Recovery HD partition by restarting your Mac while holding down the cmd+R keys.

    The OS X Utilities window appears. Select Reinstall OS X, and click Continue. The OS X Mountain Lion splash screen appears. Click Continue.

    A sheet appears informing you that your computer’s eligibility needs to be verified by Apple. Click Continue to begin the process of installing or reinstalling OS X.

    If you’re not connected to the Internet, you’ll be asked to choose a Wi-Fi network from the AirPort menu in the top-right corner.

  2. The Mountain Lion software license agreement screen appears. Read it and click Agree.

    A sheet drops down, asking whether you agree to the terms of the license agreement. Yes, you did just click Agree; this time you’re being asked to confirm that you indeed clicked the Agree button.

    If you don’t click Agree you can’t go any farther, so I advise you to click Agree now.

  3. Choose the disk on which you want to reinstall OS X by clicking its icon once in the pane where you select a disk.

    If only one suitable disk is available you won’t have to choose; it will be selected for you automatically.

    Click the Install button.

  4. A sheet asks for your Apple ID and password. Type them in the appropriate fields; click Sign In, and your Mountain Lion installation (or reinstallation) begins.

    The operating system takes 30 to 60 minutes to install, so now might be a good time to take a coffee break. When the install is finished, your Mac restarts itself. If you were reinstalling OS X on a hard disk that it had been installed on previously, you’re done.

    Your Mac will reboot and you can begin using your new, freshly installed (and ideally trouble-free) copy of OS X Mountain Lion.

    If you’re installing Mountain Lion on a hard disk for the first time, however, you still have one last step to complete. After your Mac reboots, the Setup Assistant window appears. You need to work your way through the Setup Assistant’s screens.