730525c6cf
Motivation: Websocket clients can request to speak a specific subprotocol. The list of subprotocols the client understands are sent to the server. The server should select one of the protocols an reply this with the websocket handshake response. The added code verifies that the reponded subprotocol is valid. Modifications: Added verification of the subprotocol received from the server against the subprotocol(s) that the user requests. If the user requests a subprotocol but the server responds none or a non-requested subprotocol this is an error and the handshake fails through an exception. If the user requests no subprotocol but the server responds one this is also marked as an error. Addiontionally a getter for the WebSocketClientHandshaker in the WebSocketClientProtocolHandler is added to enable the user of a WebSocketClientProtocolHandler to extract the used negotiated subprotocol. Result: The subprotocol field which is received from a websocket server is now properly verified on client side and clients and websocket connection attempts will now only succeed if both parties can negotiate on a subprotocol. If the client sends a list of multiple possible subprotocols it can extract the negotiated subprotocol through the added handshaker getter (WebSocketClientProtocolHandler.handshaker().actualSubprotocol()). |
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| pom.xml | ||