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+
+## Base Exceptions
+
+class HTTPError(Exception):
+ "Base exception used by this module."
+ pass
+
+class HTTPWarning(Warning):
+ "Base warning used by this module."
+ pass
+
+
+
+class PoolError(HTTPError):
+ "Base exception for errors caused within a pool."
+ def __init__(self, pool, message):
+ self.pool = pool
+ HTTPError.__init__(self, "%s: %s" % (pool, message))
+
+ def __reduce__(self):
+ # For pickling purposes.
+ return self.__class__, (None, None)
+
+
+class RequestError(PoolError):
+ "Base exception for PoolErrors that have associated URLs."
+ def __init__(self, pool, url, message):
+ self.url = url
+ PoolError.__init__(self, pool, message)
+
+ def __reduce__(self):
+ # For pickling purposes.
+ return self.__class__, (None, self.url, None)
+
+
+class SSLError(HTTPError):
+ "Raised when SSL certificate fails in an HTTPS connection."
+ pass
+
+
+class ProxyError(HTTPError):
+ "Raised when the connection to a proxy fails."
+ pass
+
+
+class DecodeError(HTTPError):
+ "Raised when automatic decoding based on Content-Type fails."
+ pass
+
+
+class ProtocolError(HTTPError):
+ "Raised when something unexpected happens mid-request/response."
+ pass
+
+
+#: Renamed to ProtocolError but aliased for backwards compatibility.
+ConnectionError = ProtocolError
+
+
+## Leaf Exceptions
+
+class MaxRetryError(RequestError):
+ """Raised when the maximum number of retries is exceeded.
+
+ :param pool: The connection pool
+ :type pool: :class:`~urllib3.connectionpool.HTTPConnectionPool`
+ :param string url: The requested Url
+ :param exceptions.Exception reason: The underlying error
+
+ """
+
+ def __init__(self, pool, url, reason=None):
+ self.reason = reason
+
+ message = "Max retries exceeded with url: %s (Caused by %r)" % (
+ url, reason)
+
+ RequestError.__init__(self, pool, url, message)
+
+
+class HostChangedError(RequestError):
+ "Raised when an existing pool gets a request for a foreign host."
+
+ def __init__(self, pool, url, retries=3):
+ message = "Tried to open a foreign host with url: %s" % url
+ RequestError.__init__(self, pool, url, message)
+ self.retries = retries
+
+
+class TimeoutStateError(HTTPError):
+ """ Raised when passing an invalid state to a timeout """
+ pass
+
+
+class TimeoutError(HTTPError):
+ """ Raised when a socket timeout error occurs.
+
+ Catching this error will catch both :exc:`ReadTimeoutErrors
+ <ReadTimeoutError>` and :exc:`ConnectTimeoutErrors <ConnectTimeoutError>`.
+ """
+ pass
+
+
+class ReadTimeoutError(TimeoutError, RequestError):
+ "Raised when a socket timeout occurs while receiving data from a server"
+ pass
+
+
+# This timeout error does not have a URL attached and needs to inherit from the
+# base HTTPError
+class ConnectTimeoutError(TimeoutError):
+ "Raised when a socket timeout occurs while connecting to a server"
+ pass
+
+
+class EmptyPoolError(PoolError):
+ "Raised when a pool runs out of connections and no more are allowed."
+ pass
+
+
+class ClosedPoolError(PoolError):
+ "Raised when a request enters a pool after the pool has been closed."
+ pass
+
+
+class LocationValueError(ValueError, HTTPError):
+ "Raised when there is something wrong with a given URL input."
+ pass
+
+
+class LocationParseError(LocationValueError):
+ "Raised when get_host or similar fails to parse the URL input."
+
+ def __init__(self, location):
+ message = "Failed to parse: %s" % location
+ HTTPError.__init__(self, message)
+
+ self.location = location
+
+
+class ResponseError(HTTPError):
+ "Used as a container for an error reason supplied in a MaxRetryError."
+ GENERIC_ERROR = 'too many error responses'
+ SPECIFIC_ERROR = 'too many {status_code} error responses'
+
+
+class SecurityWarning(HTTPWarning):
+ "Warned when perfoming security reducing actions"
+ pass
+
+
+class InsecureRequestWarning(SecurityWarning):
+ "Warned when making an unverified HTTPS request."
+ pass
+
+
+class SystemTimeWarning(SecurityWarning):
+ "Warned when system time is suspected to be wrong"
+ pass
+
+
+class InsecurePlatformWarning(SecurityWarning):
+ "Warned when certain SSL configuration is not available on a platform."
+ pass
+
+
+class ResponseNotChunked(ProtocolError, ValueError):
+ "Response needs to be chunked in order to read it as chunks."
+ pass