Bad Request Your browser sent a request that this server could not understand

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Although I am by no means an expert on Ubuntu, I have had two servers running for a couple of years with no problems.

Last night, when attempting to access a local website on one of them I got the error:

**Bad Request**
Your browser sent a request that this server could not understand.
Additionally, a 400 Bad Request error was encountered while trying to use an ErrorDocument to handle the request.

After several hours of frustration and no success, I rebuilt the server. While Ubuntu was installing I went to the other server and got the exact same error. The first server has now been rebuilt and it displays the same error.

I have shut down every computer on the network. Powered down the router and started over.

In addition to the two servers, the network consists of three windows machines and a Ubuntu desktop.

I have tried isolating the machines from the Internet, I have tried both wired and wireless clients.

Going to localhost on the servers displays the Ubuntu Apache Default page.

The only thing that happened about the time the problem started was the Windows decided to shutdown this machine for an update. I don't see how this could have caused a problem but I have isolated this machine from the network and the problem exists.

I cleared cookies, used five different browsers, and they all report the same error. I'm about out of ideas, and looking for any suggestions.

In my case, it's actually the underscore _ in DocumentRoot that causes problem and hours of debugging. All work fine once I remove it from my DocumentRoot path.

Bad Request Your browser sent a request that this server could not , cache: Options/Preferences -> Privacy & Security -> Cached Web Content: "Clear Now" 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.

This is due to the update RFC 3986, which claims that underscores are unsafe in virtual host servernames and other elements. In my case, I could not change the URL name, so I just allowed this underscores by enabling these unsafe urls. To do that, just add HttpProtocolOptions unsafe to the httpd.conf file.

https://httpd.apache.org/docs/2.4/mod/core.html#httpprotocoloptions

Getting Bad Request 400: ""Your browser sent a request, What does your browser sent a request that this server could not understand mean? It might be your load balancer tampers with the request data and forwards it in a way your app server does not understand. Illegal UTF-8 or truncated headers are likely candidates – da maddin Dec 4 '12 at 10:17

For newer httpd versions do not support Hyphens in the URL in that case you have to add HttpProtocolOptions unsafe to the httpd.conf file, it works fine after that.

Web Browsers, How do I fix a bad request request too long? The 400 Bad Request error is an HTTP status code that means that the request you sent to the website server, often something simple like a request to load a web page, was somehow incorrect or corrupted and the server couldn't understand it.

Okay, I'm 99.99% sure I have found the problem with the help of Capsule. The key to success was changing Apache's error level to debug. This gave me a starting point and from there a bit of trial and error and all was well.

I had two servers B777 and B767 which I used for local development. for development websites I used something like www.something.767 and www.something.777. All of the sites were listed in a hosts file.

For several years this worked just fine. For some reason I may never understand, last evening, I began to get the aforementioned error on both servers and on another I built this evening.

It seems that the problem was using numbers in the domain name. As soon as I changed a domain name from www.something.767 to www.something.local (or apparently any other non numeric characters) everything was back to normal.

I keep getting: Bad Request Your browser sent a request that this , additional text, such as "Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. This entry was posted in Software, Windows and tagged 400 Bad Request, chrome, cookies, exceeds server limit, firefox, google chrome, internet explorer, your browser sent a request that this server could not understand. size of a request header field exceeds server limit. Bookmark the permalink.

I had to remove the underscore (_) from the ServerName directive, as well as the hostname in /etc/hosts.

However, the underscore in DocumentRoot is just fine.

Thus, the relevant line in /etc/hosts looks like this:

127.0.0.1       mycoolsite.localhost

And the relevant block in /etc/apache2/extra/httpd-vhosts.conf looks like this:

<VirtualHost *:80>
    DocumentRoot "/Users/satoshi/Sites/my_cool_site"
    ServerName mycoolsite.localhost
    ErrorLog "/private/var/log/apache2/my_cool_site.localhost-error_log"
    CustomLog "/private/var/log/apache2/my_cool_site.localhost-access_log" common
</VirtualHost>

Don't forget to run apachectl restart after making your changes.

On Delta Airlines : 'Bad request: Your browser sent a request that , Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. It is not the website, as the  A 400 Bad Request error happens when a server cannot understand a request that’s been made of it. It’s called a 400 error because that’s the HTTP status code that the web server uses to describe that kind of error. A 400 Bad Request error can happen because there’s a simple error in the request.

How to Fix the 400 Bad Request Error, Getting Bad Request 400: ""Your browser sent a request that this server could not understand.", accessing John Lewis website. Original title: Bad  Size of a request header field exceeds server limit." If we use Edge there's no problem, only with Opera - updated today, but had already had the problem with previous version too. Version:65.0.3467.62 Opera is up to date Update stream:Stable System:Windows 10 64-bit

What is a 400 Bad Request Error (and How Can I Fix It)?, After typing the requested dates and cities, I get the message: "Bad Request Your browser sent a request that this server could not understand. 400 bad request. PrestaShop is a free, open source, cross-platform, and web-based(PHP5) eCommerce shopping cart application. Post Reply. Print view;

Error "browser sent a request that this server could not understand , Your browser sent a request that this server could not understand. Bad Request - Invalid URL; HTTP Error 400 - Bad Request; Bad Request: Error 

Comments
  • I failed to mention that there is nothing in the Apache error logs for either machine.
  • How do you access the servers from the local network? IP? DNS? If so, which one? Getting the default page on the server itself means Apache is not the culprit but it would be interesting to test the real vhost you're trying to access. Has your DNS been hijacked and you're not taping into your local servers at all but everything gets sent somewhere else? Worth investigating.
  • All are accessed via "local names" in the hosts file dor example
  • Verify the hosts files didn't change and try to access the same hostname from the servers themselves (that would point to localhost on the server, but still go to the correct vhost).
  • Also try with another router, it might be failing and mangles the packets on the network.
  • i am having same issue. do you know why apache react like this on "_" ?
  • @chudasamachirag i don't know why Apache behave like that.
  • I have changed "_" to "-" in ServerName, ServerAlias, VirtualHost and it works! Thanks for this hint!
  • For me it was enought to change the ServerName so that it would not have underscore. Apache should write in the error message that underscore is not supported in ServerName. It should really not waste hours of developers time for this, I am lucky that I found this post. I am using windows 7
  • Does anyone know why this error doesn't show up in the log files?
  • I was wondering how my frontends were suddenly getting that error after I moved my backend from Docker's php5.6-apache official image to php7.1-apache, thanks :) (note that my services name url had an underscore in them)
  • Exactly same thing happened with me while doing drupal multi site setup. Thanks for sharing.