New will create new http client.

NewDialer will create a new dialer with preset default value: - dialer connect timeout will be 60s - underlying conn read timeout will be 30s - underlying conn write timeout will be 30s.

DefaultDialer is the default dialer provided by httpclient package.

Conn is a generic stream-oriented network connection.

Dialer is the dialer the storage used for stream-oriented network connection.

Options is the httpclient supported options.