ASP.NET Core WebSocket failed during handshake

Question

I'm trying to use ASP.NET Core WebSocket, but got an error like this when new WebSocket("ws://localhost:5702"); in JavaScript:

WebSocket connection to 'ws://localhost:5702/' failed: Error during WebSocket handshake: Unexpected response code: 200

My Configure method in Startup.cs:

public void Configure(IApplicationBuilder app) { app.UseDefaultFiles(); app.UseStaticFiles(); app.UseWebSockets(); app.UseWebSocketHandler(); }

My Middlewares\WebSocketMiddleware.cs:
WebSocketMiddleware.cs

Does anyone know?

Thank you.

Sigge · Accepted Answer · 2017-03-28 17:19:02Z

The behaviour you are experiencing is because some other middleware (UseStaticFiles) is returning a 200 OK code to your websocket client.

To avoid this, make sure to place your WebSocket middleware before UseStaticFiles(). Personally, I'd put it at the top, like so:

 public void Configure(IApplicationBuilder app) { //first handle any websocket requests app.UseWebSockets(); app.UseWebSocketHandler(); //now handle other requests (default, static files, mvc actions, ...) app.UseDefaultFiles(); app.UseStaticFiles(); //app.UseMvc(...); }

Collectives™ on Stack Overflow

ASP.NET Core WebSocket failed during handshake

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related