# Buggy code
def create(self, method: str, url: str) -> None:
    req = http.HTTPRequest.make(method.upper(), url)
    c = connections.ClientConnection.make_dummy(("", 0))
    s = connections.ServerConnection.make_dummy((req.host, req.port))
    f = http.HTTPFlow(c, s)
    f.request = req
    f.request.headers["Host"] = req.host
    self.add([f])


# Traceback (ValueError)
Traceback (most recent call last):
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/tools/console/master.py", line 216, in run
self.loop.run()
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/main_loop.py", line 278, in run
self._run()
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/main_loop.py", line 376, in _run
self.event_loop.run()
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/main_loop.py", line 682, in run
self._loop()
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/main_loop.py", line 719, in _loop
self._watch_files[fd]()
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/raw_display.py", line 393, in <lambda>
event_loop, callback, self.get_available_raw_input())
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/raw_display.py", line 493, in parse_input
callback(processed, processed_codes)
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/main_loop.py", line 403, in _update
self.process_input(keys)
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/main_loop.py", line 503, in process_input
k = self._topmost_widget.keypress(self.screen_size, k)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/tools/console/window.py", line 293, in keypress
k = super().keypress(size, k)
File "/home/kajoj/Mitmproxy/mitmproxy/venv/lib/python3.5/site-packages/urwid/container.py", line 1116, in keypress
return self.footer.keypress((maxcol,),key)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/tools/console/statusbar.py", line 149, in keypress
return self.ab.keypress(*args, **kwargs)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/tools/console/statusbar.py", line 104, in keypress
self.prompt_execute(self._w.get_value())
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/tools/console/statusbar.py", line 124, in prompt_execute
msg = p(txt)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/tools/console/commandexecutor.py", line 17, in __call__
ret = self.master.commands.call(cmd)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/command.py", line 221, in call
return self.call_args(parts[0], parts[1:])
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/command.py", line 212, in call_args
return self.commands[path].call(args)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/command.py", line 101, in call
ret = self.func(*pargs)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/command.py", line 251, in wrapper
return function(*args, **kwargs)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/addons/view.py", line 444, in create
req = http.HTTPRequest.make(method.upper(), url)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/net/http/request.py", line 103, in make
req.url = url
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/net/http/request.py", line 291, in url
self.scheme, self.host, self.port, self.path = mitmproxy.net.http.url.parse(url)
File "/home/kajoj/Mitmproxy/mitmproxy/mitmproxy/net/http/url.py", line 27, in parse
raise ValueError("No hostname given")
ValueError: No hostname given

# Fixed code
def create(self, method: str, url: str) -> None:
    try:
        req = http.HTTPRequest.make(method.upper(), url)
    except ValueError as e:
        ctx.log.error(e)
        return
    c = connections.ClientConnection.make_dummy(("", 0))
    s = connections.ServerConnection.make_dummy((req.host, req.port))
    f = http.HTTPFlow(c, s)
    f.request = req
    f.request.headers["Host"] = req.host
    self.add([f])