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404.10
Request header too long
Description
Likely the page is was incorrectly built or the web server configuration is wrong.
A request header is an item in a web page that tells the server special information. For example, it might specify the language to use or authentication information. There are more than twenty different types of request headers.
Example
Server Error
404.10 - Request header too long.
One of the request headers is longer than the specified limit configured in the server.
Error messages will differ depending on the web server and if replaced by the web site designers.
Occurrences
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
This issue can only be fixed by the web site owner.
Solution 1 of 1 - Notify Webmaster
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You might notify the webmaster about the issue. Include the error number and the address (URL) where the error occurred along with any other relevant details.
Many sites use an email address in the form webmaster@sitename.com where you replace sitename.com with the web sites address (don't include a www). Keep in mind with the amount of spam, they may use a different address and/or it might get ignored. Check the websites' contact information to get reliable contact information.
Official Explanation
The request is denied because the request headers are too long.
"404.10 - Request header too long" is only supported by Microsoft IIS (Internet Information Services) web server version 7 and later.
The four hundred series of errors indicate something was sent to the remote web server incorrectly.
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