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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