RequestException
|___HTTPError
|___ConnectionError
|   |___ProxyError	
|   |___SSLError	
|___Timeout
|   |___ConnectTimeout
|   |___ReadTimeout
|___URLRequired
|___TooManyRedirects
|___MissingSchema
|___InvalidSchema
|___InvalidURL
|   |___InvalidProxyURL
|___InvalidHeader
|___ChunkedEncodingError
|___ContentDecodingError
|___StreamConsumedError
|___RetryError
|___UnrewindableBodyError