Why does this code only returns its output only once?

I am in China. I use a proxy to connect to the internet and when I want to proxy a program, I tunnel it with proxychains. Now, the question: I have this code, which is a simple auth against the YouTube API:

import httplib2import osimport loggingfrom oauth2client import toolsfrom oauth2client.client import AccessTokenCredentials#from oauth2client.client import AccessTokenRefreshErrorfrom googleapiclient.discovery import buildfrom googleapiclient.http import MediaFileUploadfrom googleapiclient.errors import HttpErrorimport urlliblogger = logging.getLogger()logger.setLevel(logging.DEBUG)def authenticate():    httplib2.debuglevel = 4    acc_token = "ya29.dgLFP1i6jTuc-hnaC9D704i2jbQ2HOHweSqxjL9GxSFBg8QgvU"    user_agent = 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36'    flow = AccessTokenCredentials(acc_token, user_agent)    http = flow.authorize(httplib2.Http())    service = build('youtube', 'v3', http=http)    return(service)def initialize_upload(youtube):    tags = 'classical music', 'yehudi mehunin'    body = dict(        snippet=dict(            title='some title',            description='a  description',            tags=tags,            categoryId='4'        ),        status=dict(            privacyStatus='Private'        )    )    youtube.videos().insert(part=",".join(body.keys()), body=body, media_body=MediaFileUpload('1977.mp4', mimetype='video/mp4', chunksize=1024 * 1024, resumable=False))def first():    youtube = authenticate()    initialize_upload(youtube)first()

When I first turn on my computer, I activate my virtualenv, execute the script form a terminal without proxying it, and I get a timeout (I have to break it manually to exit) and I get this output:

^CTraceback (most recent call last):  File "youtubeconnect.py", line 48, in <module>    first()  File "youtubeconnect.py", line 45, in first    youtube = authenticate()  File "youtubeconnect.py", line 21, in authenticate    service = build('youtube', 'v3', http=http)  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/oauth2client-1.5.2-py3.5.egg/oauth2client/util.py", line 140, in positional_wrapper  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/google_api_python_client-1.4.2-py3.5.egg/googleapiclient/discovery.py", line 196, in build  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/google_api_python_client-1.4.2-py3.5.egg/googleapiclient/discovery.py", line 242, in _retrieve_discovery_doc  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/oauth2client-1.5.2-py3.5.egg/oauth2client/client.py", line 596, in new_request  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/httplib2-0.9.2-py3.5.egg/httplib2/__init__.py", line 1314, in request    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/httplib2-0.9.2-py3.5.egg/httplib2/__init__.py", line 1064, in _request    (response, content) = self._conn_request(conn, request_uri, method, body, headers)  File "/home/xavier/Code/autotube/venv/lib/python3.5/site-packages/httplib2-0.9.2-py3.5.egg/httplib2/__init__.py", line 987, in _conn_request    conn.connect()  File "/usr/lib/python3.5/http/client.py", line 1229, in connect    super().connect()  File "/usr/lib/python3.5/http/client.py", line 826, in connect    (self.host,self.port), self.timeout, self.source_address)  File "/usr/lib/python3.5/socket.py", line 702, in create_connection    sock.connect(sa)KeyboardInterrupt

Now, I run it for the first time tunneled with proxychains and I get a response:

|DNS-request| www.googleapis.com |S-chain|-<>-127.0.0.1:1080-<><>-4.2.2.2:53-<><>-OK|DNS-response| www.googleapis.com is 74.125.29.95|S-chain|-<>-127.0.0.1:1080-<><>-74.125.29.95:443-<><>-OKsend: b'GET /discovery/v1/apis/youtube/v3/rest HTTP/1.1\r\nHost: www.googleapis.com\r\nuser-agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36\r\nauthorization: Bearer ya29.dgLFP1i6jTuc-hnaC9D704i2jbQ2HOHweSqxjL9GxSF\r\naccept-encoding: gzip, deflate\r\n\r\n'reply: 'HTTP/1.1 200 OK\r\n'header: Expires header: Date header: ETag header: Vary header: Vary header: Content-Type header: Content-Encoding header: X-Content-Type-Options header: X-Frame-Options header: X-XSS-Protection header: Server header: Content-Length header: Age header: Cache-Control header: Alternate-Protocol header: Alt-Svc (venv) xavier@xavier:~/Code/autotube$ proxychains python3 youtubeconnect.py ProxyChains-3.1 (http://proxychains.sf.net)

Now, why when I run it again, both tunneling it and not tunneling it, the script executes and doesn't give any output anymore? The script executes without error and that's it. No output. I can only get output when I restart my computer. Is the API or some library using a cache or something similar? I have also tried deactivating and reactivating the venv, but everything remains the same. Does someone know?