The Web Application Hacker’s Handbook Discovering and Exploiting Security Flaws

413 Request Entity Too Large — 

If you are probing for buffer overflow

vulnerabilities in native code, and so submitting long strings of data,

this indicates that the body of your request is too large for the server to

handle.

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414 Request URI Too Long — 

Similar to the previous response, this

indicates that the URL used in the request is too large for the server to

handle.

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500 Internal Server Error — 

This indicates that the server encountered

an error fulfilling the request. This normally occurs when you have sub-

mitted unexpected input that caused an unhandled error somewhere

within the application’s processing. You should review the full contents

of the server’s response closely for any details indicating the nature of

the error.

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