Robustness against fuzzers

[mmaker]

I tried to use a fuzzer against cyclone, specifically:
pathoc -e -I 200 -t 2 -n 1000 localhost -p 8888 get:/:b@10:ir,@1
which generates some exceptions even on the helloworld httpserver run with:
python demos/helloworld/helloworld.py
(following)

2014-08-23 11:12:28+0200 Unhandled Error
        Traceback (most recent call last):
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/log.py",
        line 88, in callWithLogger
            return callWithContext({"system": lp}, func, *args, **kw)
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/log.py",
        line 73, in callWithContext
            return context.call({ILogContext: newCtx}, func, *args, **kw)
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/context.py",
        line 118, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/context.py",
        line 81, in callWithContext
            return func(*args,**kw)
        --- <exception caught here> ---
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/internet/posixbase.py",
        line 614, in _doReadOrWrite
            why = selectable.doRead()
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/internet/tcp.py",
        line 214, in doRead
            return self._dataReceived(data)
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/internet/tcp.py",
        line 220, in _dataReceived
            rval = self.protocol.dataReceived(data)
          File
        "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/protocols/basic.py",
        line 571, in dataReceived
            why = self.lineReceived(line)
          File "/home/maker/dev/cyclone/cyclone/httpserver.py", line 96, in
        lineReceived
            self._on_headers(buff)
          File "/home/maker/dev/cyclone/cyclone/httpserver.py", line 158, in
        _on_headers
            headers = httputil.HTTPHeaders.parse(data[eol:])
          File "/home/maker/dev/cyclone/cyclone/httputil.py", line 133, in parse
            h.parse_line(line)
          File "/home/maker/dev/cyclone/cyclone/httputil.py", line 118, in
        parse_line
            name, value = line.split(":", 1)
        exceptions.ValueError: need more than 1 value to unpack

2014-08-23 11:12:28+0200 [http] 404 GET / (127.0.0.1) 0.33ms

2014-08-23 11:12:27+0200 Unhandled Error
        Traceback (most recent call last):
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/log.py",
          line 88, in callWithLogger
            return callWithContext({"system": lp}, func, *args, **kw)
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/log.py",
          line 73, in callWithContext
            return context.call({ILogContext: newCtx}, func, *args, **kw)
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/context.py",
          line 118, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/python/context.py",
          line 81, in callWithContext
            return func(*args,**kw)
        --- <exception caught here> ---
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/internet/posixbase.py",
          line 614, in _doReadOrWrite
            why = selectable.doRead()
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/internet/tcp.py",
          line 214, in doRead
            return self._dataReceived(data)
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/internet/tcp.py",
          line 220, in _dataReceived
            rval = self.protocol.dataReceived(data)
          File
          "/home/maker/.venvs/cyclone/local/lib/python2.7/site-packages/twisted/protocols/basic.py",
          line 571, in dataReceived
            why = self.lineReceived(line)
          File "/home/maker/dev/cyclone/cyclone/httpserver.py", line 96, in
          lineReceived
            self._on_headers(buff)
          File "/home/maker/dev/cyclone/cyclone/httpserver.py", line 163, in
          _on_headers
            content_length = int(headers.get("Content-Length", 0))
        exceptions.ValueError: invalid literal for int() with base 10: '\xc3\xbc
        10'