Server crash if HTTP-version is a string or a very large number

Sending a HTTP GET-request with HTTP-version as a string or a very large number will cause the server to crash due to an invalid argument.

Recreating the problem:

Connect to the server with

telnet localhost 8080

Send a GET-request with a string as HTTP-version, for example:

GET / HTTP/test

OR send a GET-request with a very large number as HTTP-version, for example:

GET / HTTP/999999999999999999999999999999999999999999999999999999

Backtrace:

o2_bt