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

Question

There are two application servers and a switch  When i access application by using application server ip it works fine  However if i use switch ip in my url Bad request error throws up only for firefox and chrome for a few links only

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If you are getting this error on the WordPress website  check the below solution   Corrupted Browser Cache  amp  Cookies  Delete your Cookies and clear your cache Restart your server

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I m a bit late to the party  but bumped in to this issue whilst working with the openidc auth module   I ended up noticing that cookies were not being cleared properly  and I had at least 10 mod auth openidc state     cookies  all of which would be sent by my browser whenever I made a request     If this sounds familiar to you  double check your cookies

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Here is a detailed explanation  amp  solution for this problem from ibm  Problem Abstract  Request to HTTP Server fails with Response code 400  Symptom Response from the browser could be shown like this  Bad Request Your browser sent a request that this server could not understand  Size of a request header field exceeds server limit  HTTP Server Error log shows the following message   quot request failed  error reading the headers quot  Cause This is normally caused by having a very large Cookie  so a request header field exceeded the limit set for Web Server  Diagnosing the problem To assist with diagnose of the problem you can add the following to the LogFormat directive in the httpd conf  error-note    error-notes n Resolving the problem For server side  Increase the value for the directive LimitRequestFieldSize in the httpd conf  LimitRequestFieldSize 12288 or 16384 For How to set the LimitRequestFieldSize  check Increase the value of LimitRequestFieldSize in Apache For client side  Clear the cache of your web browser should be fine

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If you use Apache httpd web server in version above 2 2 15-60  then it could be also because of underscore   in hostname   https   ma ttias be apache-httpd-2-2-15-60-underscores-hostnames-now-blocked

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Make sure you url encode all of the query params in your url   In my case there was a space     in my url  and I was making an API call using curl  and my api server was giving this error   Means the following url http   somedomain com key some value with space  should be  http   somedomain com  key some 20value 20with 20space

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I got Bad Request  Your browser sent a request that this server could not understand when I tried to download a file to the target machine using curl  I solved it by instead using scp to copy the file from the source machine to the target machine

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In my case is a cookie-related issue  I had many cookies with value extremely big  and that was causing the problem  You can replicate this issue here on stackoverflow com  just open the console and type this       Array 5    forEach  i  idx    gt        document cookie    stackoverflow cookie  idx     a  repeat 4000          What is that  I am creating 5 cookies with a string of length or value of 4000 bytes  then reload the page and you will see the same issue  I tried it on google com and you ll get the error but they automatically clear the cookies for you  which is a nice fallback to start fresh

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in my case   in header      Content-Typespacespace   or     Content-Typetab   with two space or tab  when i remove it then it worked

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in my magento2 website  show exactly the same error when click a product   my solution is to go to edit the value of Search Engine Optimization - URL Key of this product   make sure that there are only alphabet number and - in URL Key  such as 100-washed-cotton-duvet-cover-set  deleting all other special characters  such as

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I just deleted my stored cookies  site data  and cache from my browser    It worked  I m using firefox

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I was testing my application with special characters  amp  was observing the same error  After some research  turns out the   symbol was the cause  I had to modify it to the encoded representation  25  Its all fine now  thanks to the below post  https   superuser com questions 759959 why-does-the-percent-sign-in-a-url-cause-an-http-400-bad-request-error

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

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