Pool Manager#
- class urllib3.PoolManager(num_pools=10, headers=None, **connection_pool_kw)#
- Bases: - RequestMethods- Allows for arbitrary requests while transparently keeping track of necessary connection pools for you. - Parameters:
- num_pools – Number of connection pools to cache before discarding the least recently used pool. 
- headers – Headers to include with all requests, unless other headers are given explicitly. 
- **connection_pool_kw – Additional parameters are used to create fresh - urllib3.connectionpool.ConnectionPoolinstances.
 
 - Example: - >>> manager = PoolManager(num_pools=2) >>> r = manager.request('GET', 'http://google.com/') >>> r = manager.request('GET', 'http://google.com/mail') >>> r = manager.request('GET', 'http://yahoo.com/') >>> len(manager.pools) 2 - clear()#
- Empty our store of pools and direct them all to close. - This will not affect in-flight connections, but they will not be re-used after completion. 
 - connection_from_context(request_context)#
- Get a - urllib3.connectionpool.ConnectionPoolbased on the request context.- request_contextmust at least contain the- schemekey and its value must be a key in- key_fn_by_schemeinstance variable.
 - connection_from_host(host, port=None, scheme='http', pool_kwargs=None)#
- Get a - urllib3.connectionpool.ConnectionPoolbased on the host, port, and scheme.- If - portisn’t given, it will be derived from the- schemeusing- urllib3.connectionpool.port_by_scheme. If- pool_kwargsis provided, it is merged with the instance’s- connection_pool_kwvariable and used to create the new connection pool, if one is needed.
 - connection_from_pool_key(pool_key, request_context=None)#
- Get a - urllib3.connectionpool.ConnectionPoolbased on the provided pool key.- pool_keyshould be a namedtuple that only contains immutable objects. At a minimum it must have the- scheme,- host, and- portfields.
 - connection_from_url(url, pool_kwargs=None)#
- Similar to - urllib3.connectionpool.connection_from_url().- If - pool_kwargsis not provided and a new pool needs to be constructed,- self.connection_pool_kwis used to initialize the- urllib3.connectionpool.ConnectionPool. If- pool_kwargsis provided, it is used instead. Note that if a new pool does not need to be created for the request, the provided- pool_kwargsare not used.
 - proxy = None#
 - proxy_config = None#
 - urlopen(method, url, redirect=True, **kw)#
- Same as - urllib3.HTTPConnectionPool.urlopen()with custom cross-host redirect logic and only sends the request-uri portion of the- url.- The given - urlparameter must be absolute, such that an appropriate- urllib3.connectionpool.ConnectionPoolcan be chosen for it.
 
- class urllib3.ProxyManager(proxy_url, num_pools=10, headers=None, proxy_headers=None, proxy_ssl_context=None, use_forwarding_for_https=False, **connection_pool_kw)#
- Bases: - PoolManager- Behaves just like - PoolManager, but sends all requests through the defined proxy, using the CONNECT method for HTTPS URLs.- Parameters:
- proxy_url – The URL of the proxy to be used. 
- proxy_headers – A dictionary containing headers that will be sent to the proxy. In case of HTTP they are being sent with each request, while in the HTTPS/CONNECT case they are sent only once. Could be used for proxy authentication. 
- proxy_ssl_context – The proxy SSL context is used to establish the TLS connection to the proxy when using HTTPS proxies. 
- use_forwarding_for_https – (Defaults to False) If set to True will forward requests to the HTTPS proxy to be made on behalf of the client instead of creating a TLS tunnel via the CONNECT method. Enabling this flag means that request and response headers and content will be visible from the HTTPS proxy whereas tunneling keeps request and response headers and content private. IP address, target hostname, SNI, and port are always visible to an HTTPS proxy even when this flag is disabled. 
 
 - Example:
- >>> proxy = urllib3.ProxyManager('http://localhost:3128/') >>> r1 = proxy.request('GET', 'http://google.com/') >>> r2 = proxy.request('GET', 'http://httpbin.org/') >>> len(proxy.pools) 1 >>> r3 = proxy.request('GET', 'https://httpbin.org/') >>> r4 = proxy.request('GET', 'https://twitter.com/') >>> len(proxy.pools) 3 
 - connection_from_host(host, port=None, scheme='http', pool_kwargs=None)#
- Get a - urllib3.connectionpool.ConnectionPoolbased on the host, port, and scheme.- If - portisn’t given, it will be derived from the- schemeusing- urllib3.connectionpool.port_by_scheme. If- pool_kwargsis provided, it is merged with the instance’s- connection_pool_kwvariable and used to create the new connection pool, if one is needed.
 - urlopen(method, url, redirect=True, **kw)#
- Same as HTTP(S)ConnectionPool.urlopen, - urlmust be absolute.