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  1. import requests
  2.  
  3.  
  4. def select_proxy(url, proxies):
  5.     """Select a proxy for the url, if applicable.
  6.  
  7.     :param url: The url being for the request
  8.     :param proxies: A dictionary of schemes or schemes and hosts to proxy URLs
  9.     """
  10.     proxies = proxies or {}
  11.     urlparts = requests.utils.urlparse(url)
  12.     if urlparts.hostname is None:
  13.         return proxies.get(urlparts.scheme, proxies.get('all'))
  14.  
  15.     proxy = None
  16.     if requests.utils.should_bypass_proxies(url, proxies.get('no_proxy')):
  17.         return proxy
  18.  
  19.     proxy_keys = [
  20.         urlparts.scheme + '://' + urlparts.hostname,
  21.         urlparts.scheme,
  22.         'all://' + urlparts.hostname,
  23.         'all',
  24.     ]
  25.  
  26.     for proxy_key in proxy_keys:
  27.         if proxy_key in proxies:
  28.             proxy = proxies[proxy_key]
  29.             break
  30.  
  31.     return proxy
  32.  
  33.  
  34. class NoProxyAdapter(requests.adapters.HTTPAdapter):
  35.     def get_connection(self, url, proxies=None):
  36.         """Returns a urllib3 connection for the given URL. This should not be
  37.         called from user code, and is only exposed for use when subclassing the
  38.         :class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
  39.  
  40.         :param url: The URL to connect to.
  41.         :param proxies: (optional) A Requests-style dictionary of proxies used on this request.
  42.         :rtype: urllib3.ConnectionPool
  43.         """
  44.         proxy = select_proxy(url, proxies)
  45.  
  46.         if proxy and proxy not in proxies.get('no_proxy', []):
  47.             proxy = requests.adapters.prepend_scheme_if_needed(proxy, 'http')
  48.             proxy_manager = self.proxy_manager_for(proxy)
  49.             conn = proxy_manager.connection_from_url(url)
  50.         else:
  51.             # Only scheme should be lower case
  52.             parsed = requests.adapters.urlparse(url)
  53.             url = parsed.geturl()
  54.             conn = self.poolmanager.connection_from_url(url)
  55.  
  56.         return conn
  57.  
  58.  
  59. if __name__ == "__main__":
  60.     s = requests.Session()
  61.     s.mount('http://', NoProxyAdapter())
  62.     r = requests.Request(url='http://127.0.0.2').prepare()
  63.     s.send(
  64.         r,
  65.         proxies={
  66.             'http': 'http://127.0.0.1:8090',
  67.             'no_proxy': '127.0.0.2',
  68.         },
  69.     )
  70.  
Runtime error #stdin #stdout #stderr 0.04s 9320KB
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Standard input is empty
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Standard output is empty
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Traceback (most recent call last):
  File "./prog.py", line 1, in <module>
ImportError: No module named 'requests'
https://ideone.com/Nx4mIC
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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