Special method sending a SWITCHING_PROTOCOLS response to the client.
Notice: For the overload that returns a ConnectionStream, it must be ensured that the returned instance doesn't outlive the request handler callback.
The protocol set in the "Upgrade" header of the response. Use an empty string to skip setting this field.
See Implementation
Special method sending a SWITCHING_PROTOCOLS response to the client.
Notice: For the overload that returns a ConnectionStream, it must be ensured that the returned instance doesn't outlive the request handler callback.