Github user SvetlinZarev commented on the issue: https://github.com/apache/tomcat/pull/39 It's not a no-op. Imagine the following case: WS-Host: wss://echo.websocket.org proxy-host: proxy proxy-port: 8080 The flow is as follows: URI path = the WS-HOST String host = path.getHost(); int port = path.getPort(); //-1 if the ":port" part of the authority is missing if(hasProxy){ proxyConnect = createProxyRequest(host, port); }else{ if(-1 == port) then do portDiscovery -> 80/443 depending on ws/wss scheme ... } So here in the proxy case the port will be -1, because WS-Host does not specify host. As a result the CONNECT request will not contain port in the request line -> hence invalid CONNECT request. In the non-proxy case the original code correctly performs port discovery based on the scheme( if a port is not explicitly provided in WS-Host). So what I did was to do port discovery if no port is specified, regardless of proxy configuration.
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