Sub-Filter auf SignalR ASP.NET Core Hub

s.schabbach at s.schabbach at
Mon Mar 9 11:56:33 UTC 2020



I need your help to solve an issue with the SignalR library. For those of you how do not know: It is a library to establish an bidirectional connection between server and browser in an webapp using javascript. 

On my server I have a multi-application environment, were the web application is resolved using the “webapp” location and then using a reverse proxy to the application running on localhost. 

The same procedure I use for several services, where the location is “xxx-service”. 


For fixing the URL’s in the server response, I use several sub_filters to align urls from “/resource” to “/webui/resource” to make links, formulars and so on going to the /webui/ location again.

The same thing I do with the SignalR hub the client connects to. These hub is going to be changed from /hub to /webui/hub.  


But these results in the following error:


[2020-03-09T10:38:26.393Z] Information: Normalizing '/webui/hub' to ''.  <webpack://node_modules/@microsoft/signalr/dist/esm/Utils.js> Utils.js:204:39

Firefox kann keine Verbindung zu dem Server unter wss:// aufbauen.  <webpack://node_modules/@microsoft/signalr/dist/esm/WebSocketTransport.js> WebSocketTransport.js:88:32

[2020-03-09T10:38:27.071Z] Error: Failed to start the transport 'WebSockets': Error: There was an error with the transport.  <webpack://node_modules/@microsoft/signalr/dist/esm/Utils.js> Utils.js:198:39

[2020-03-09T10:38:42.158Z] Information: SSE connected to  <webpack://node_modules/@microsoft/signalr/dist/esm/Utils.js> Utils.js:204:39

[2020-03-09T10:38:42.175Z] Error: Connection disconnected with error 'Error: Server returned handshake error: Handshake was canceled.'.  <webpack://node_modules/@microsoft/signalr/dist/esm/Utils.js> Utils.js:198:39

Error: Server returned handshake error: Handshake was canceled.


In the Access log I see an 404 Error, but don’t know how to handle them: - - [09/Mar/2020:11:38:42 +0100] "GET /webui/hub?id=a6T9oscwfbe-l0CRzOvCtw HTTP/1.1" 200 80 "" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:73.0) Gecko/20100101 Firefox/73.0" - - [09/Mar/2020:11:38:42 +0100] "POST /webui/hub?id=a6T9oscwfbe-l0CRzOvCtw HTTP/1.1" 404 37 "" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:73.0) Gecko/20100101 Firefox/73.0"


Any ideas how to solve that?


Kind regards, 



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