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I'm using Bottle in python to make a simple app proxy.

And I just want to change the host, the code is like below:

def get_proxy_response():
 print('>>>> START')
 resp = requests.request('get', 'http://127.0.0.1:18080/', headers=dict(Host='www.mysite.com'))
 print('<<<< FINISH')
 return resp

The code works in my development laptop, but when I put the code in production(CentOS6 with Python3.4.8), it was hanging in the request line, and kept for a long time, finally raises the below error, and then causes a 504 response:

>>>> START
127.0.0.1 - - [12/Nov/2018 20:59:57] "GET /index.html HTTP/1.0" 504 1229
Traceback (most recent call last):
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 138, in run
 self.finish_response()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 180, in finish_response
 self.write(data)
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 274, in write
 self.send_headers()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 332, in send_headers
 self.send_preamble()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 255, in send_preamble
 ('Date: %srn' % format_date_time(time.time())).encode('iso-8859-1')
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 453, in _write
 self.stdout.write(data)
 File "/usr/lib64/python3.4/socket.py", line 398, in write
 return self._sock.send(b)
BrokenPipeError: [Errno 32] Broken pipe
127.0.0.1 - - [12/Nov/2018 20:59:57] "GET /index.html HTTP/1.0" 500 59
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 43046)
Traceback (most recent call last):
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 138, in run
 self.finish_response()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 180, in finish_response
 self.write(data)
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 274, in write
 self.send_headers()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 332, in send_headers
 self.send_preamble()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 255, in send_preamble
 ('Date: %srn' % format_date_time(time.time())).encode('iso-8859-1')
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 453, in _write
 self.stdout.write(data)
 File "/usr/lib64/python3.4/socket.py", line 398, in write
 return self._sock.send(b)
BrokenPipeError: [Errno 32] Broken pipe

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 141, in run
 self.handle_error()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 368, in handle_error
 self.finish_response()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 180, in finish_response
 self.write(data)
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 274, in write
 self.send_headers()
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 331, in send_headers
 if not self.origin_server or self.client_is_modern():
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 344, in client_is_modern
 return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
TypeError: 'NoneType' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "/usr/lib64/python3.4/socketserver.py", line 305, in _handle_request_noblock
 self.process_request(request, client_address)
 File "/usr/lib64/python3.4/socketserver.py", line 331, in process_request
 self.finish_request(request, client_address)
 File "/usr/lib64/python3.4/socketserver.py", line 344, in finish_request
 self.RequestHandlerClass(request, client_address, self)
 File "/usr/lib64/python3.4/socketserver.py", line 673, in __init__
 self.handle()
 File "/usr/lib64/python3.4/wsgiref/simple_server.py", line 133, in handle
 handler.run(self.server.get_app())
 File "/usr/lib64/python3.4/wsgiref/handlers.py", line 144, in run
 self.close()
 File "/usr/lib64/python3.4/wsgiref/simple_server.py", line 35, in close
 self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'
----------------------------------------

The more confusing thing is that the situation depends on the host name what i set, my backend application will return the right content when I get with Host: www.mysite.com, while other will returns a simple Site not found content.

So if I set the request header to headers=dict(Host='www.yoursite.com'), it finished as expect which telling the right Site not found content.