[Source](http://web.mit.edu/afs.new/athena/course/2/2.75/resources/random/How Complex Systems Fail.pdf "Permalink to 400 Bad Request")

# 400 Bad Request

# Bad Request

Your browser sent a request that this server could not understand.

The request line contained invalid characters following the protocol string.

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Apache/1.3.41 Server at web.mit.edu Port 80