wsgi: Uncaught exception

when i send a request like this:HTTPServerRequest(protocol='https', host=': localhost', method='GET', uri='/', version='HTTP/1.1', remote_ip='127.0.0.1')
there is a exception as follow:

ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/tornado/http1connection.py", line 273, in _read_message
delegate.finish()
File "/usr/local/lib/python3.8/site-packages/tornado/httpserver.py", line 280, in finish
self.request_callback(self.request)
File "/usr/local/lib/python3.8/site-packages/tornado/wsgi.py", line 114, in call
WSGIContainer.environ(request), start_response
File ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/tornado/http1connection.py", line 273, in _read_message
delegate.finish()
File "/usr/local/lib/python3.8/site-packages/tornado/httpserver.py", line 280, in finish
self.request_callback(self.request)
File "/usr/local/lib/python3.8/site-packages/tornado/wsgi.py", line 114, in call
WSGIContainer.environ(request), start_response
File "/usr/local/lib/python3.8/site-packages/tornado/wsgi.py", line 154, in environ
port = int(hostport[1])
ValueError: invalid literal for int() with base 10: ' localhost'
/wsgi.py", line 154, in environ
port = int(hostport[1])
ValueError: invalid literal for int() with base 10: ' localhost'

Read tornado/wsgi.py around WSGIContainer.environ(), especially the host and port parsing near line 154. Reproduce the reported request and inspect existing WSGI tests for related host formatting cases. Done means the reported input has defined behavior without the uncaught ValueError and is covered by a regression test.