Invalid HTTP header causes panic

[alfreb]

Reproduce:
$ echo "Rico, can you handle this?" | nc trident3.vlab.cs.hioa.no 8081

Result on Acorn:

<Server> Responding with index.html. 
terminating with uncaught exception of type std::invalid_argument: stoul: no conversion

         !!! abort_ex. Why: terminating with uncaught exception of type std::invalid_argument: stoul: no conversion
         **** PANIC: ****
 terminating with uncaught exception of type std::invalid_argument: stoul: no conversion
        Heap end: 0x2c9a000

I think it will suffice to just do a try/catch for each request to the server. Any exception should probably result in a 500 Internal Server Error

[RicoAntonioFelix]

This issue can now be closed since the parser now checks for invalid input.