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Dependency resolver fails behind proxy on init command

See original GitHub issue

I am on the latest Poetry version.
I have searched the issues of this repo and believe that this is not a duplicate.
If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).
OS version and name: Ubuntu 18.04
Poetry version: 0.11.1

Hi,

even with the proper environment variables it seems that the dependency resolver fails to contact PyPI repository in interactive init command. Here is the trace:

poetry init -vvv
[...]
Would you like to define your dependencies (require) interactively? (yes/no) [yes] 
Search for package: numpy
                                      
[OSError]              
[Errno 101] Network is unreachable  
                                      
Exception trace:
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/_vendor/cleo/application.py in run() at line 94
   status_code = self.do_run(input_, output_)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/console/application.py in do_run() at line 88
   return super(Application, self).do_run(i, o)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/_vendor/cleo/application.py in do_run() at line 197
   status_code = command.run(input_, output_)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/console/commands/command.py in run() at line 72
   return super(BaseCommand, self).run(i, o)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/_vendor/cleo/commands/base_command.py in run() at line 146
   status_code = self.execute(input_, output_)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/_vendor/cleo/commands/command.py in execute() at line 107
   return self.handle()
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/console/commands/init.py in handle() at line 114
   self._determine_requirements(self.option("dependency"))
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/console/commands/init.py in _determine_requirements() at line 157
   matches = self._get_pool().search(package)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/repositories/pool.py in search() at line 98
   results += repository.search(query, mode=mode)
 /home/alex/anaconda3/lib/python3.6/site-packages/poetry/repositories/pypi_repository.py in search() at line 198
   hits = client.search(search, "or")
 /home/alex/anaconda3/lib/python3.6/xmlrpc/client.py in __call__() at line 1112
   return self.__send(self.__name, args)
 /home/alex/anaconda3/lib/python3.6/xmlrpc/client.py in __request() at line 1452
   verbose=self.__verbose
 /home/alex/anaconda3/lib/python3.6/xmlrpc/client.py in request() at line 1154
   return self.single_request(host, handler, request_body, verbose)
 /home/alex/anaconda3/lib/python3.6/xmlrpc/client.py in single_request() at line 1166
   http_conn = self.send_request(host, handler, request_body, verbose)
 /home/alex/anaconda3/lib/python3.6/xmlrpc/client.py in send_request() at line 1279
   self.send_content(connection, request_body)
 /home/alex/anaconda3/lib/python3.6/xmlrpc/client.py in send_content() at line 1309
   connection.endheaders(request_body)
 /home/alex/anaconda3/lib/python3.6/http/client.py in endheaders() at line 1234
   self._send_output(message_body, encode_chunked=encode_chunked)
 /home/alex/anaconda3/lib/python3.6/http/client.py in _send_output() at line 1026
   self.send(msg)
 /home/alex/anaconda3/lib/python3.6/http/client.py in send() at line 964
   self.connect()
 /home/alex/anaconda3/lib/python3.6/http/client.py in connect() at line 1392
   super().connect()
 /home/alex/anaconda3/lib/python3.6/http/client.py in connect() at line 936
   (self.host,self.port), self.timeout, self.source_address)
 /home/alex/anaconda3/lib/python3.6/socket.py in create_connection() at line 724
   raise err
 /home/alex/anaconda3/lib/python3.6/socket.py in create_connection() at line 713
   sock.connect(sa)

The odd thing is poetry add numpy with an empty pyproject.toml works just fine although it relies on the same _determine_requirements() method.

I did not encounter this issue on an unproxied connection.

Edit: upgrade poetry version from 0.10.2 to 0.11.1 & follow contributing guide