SignalR: Error during WebSocket handshake: Unexpected response code: 400

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I have just started working with SignalR. I have implemented real-time data reflection on my site using signalr. I was getting "Error during Web-Socket handshake: Unexpected response code: 400" error on console with when trying to connect with web-socket.

Application is developed with Asp.net MVC - signalR 2.0.3 and hosted On Windows server 2012 - IIS 8

I found one solution from this link

It says that We need website to point to HTTPS (and avail SSL) then http to work with web-socket. And my Issue resolved too. My doubt is - cant we solve this issue without using HTTPS ? As each website might not require to be hosted on HTTPS (which requires SSL).


use this tag in your web.config file :

<httpRuntime maxRequestLength="40960" targetFramework="4.5" requestValidationMode="2.0" />

under <system.web> tag. Describe your target framework.Error will be disappear

'Error during WebSocket handshake: Unexpected response code , Hi, In two different occurrences, we've had customers reporting issues with SignalR connectivity. What's bothering me with this issue is this is  Seems he fixed by moving the call to app.UseSignalR() above app.UseMvc(). which seems strange.In your Startup.cs how did you configure it? You have to call services.AddSignalR(); and app.UseSignalR(routes => maybe share with us that part from your code. – jpgrassi May 3 '19 at 8:35


If the problem are the proxies that exists in the path from client to server, there is nothing you can do but complain to your provider (both client and server).

How HTML5 Web Sockets Interact With Proxy Servers

By using a secure connection, you ensure that no proxy is going to mess with your connection.

Error during WebSocket handshake: Unexpected response code , I'm attempting to use SignalR on my local machine, but it appears that IIS/Express on Windows 7 isn't supported. What are my options for local  The thing is sometimes it works, returns 101 Switching Protocols response message but sometimes "Http Upgrade failed with status code 400". Any ideas how to fix this issue? Back-end is powered by ASP.NET SignalR.


This 400 error can also happen if you are running on multiple servers behind a load balancer. Inspect the body of the 400 response (ex., using Fiddler) and see if you find this: The ConnectionId is in the incorrect format. If so, then your problem may be that you are not using the same machine key on each application server.

See this answer for details on the solution: https://stackoverflow.com/a/43479474/979202

Error during WebSocket handshake: Unexpected response code, I have implemented real-time data reflection on my site using signalr. I was getting "Error during Web-Socket handshake: Unexpected response code: 400" error  The issue in my case was the Websocket protocol was not installed on server. Installed it from Server manager -> Add Roles and Features and it worked Sign up for free to join this conversation on GitHub .


I was having same issue in .Net Core Web API with Angular 8 front end. The issue in my case was the Websocket protocol was not installed on server. Installed it from Server manager -> Add Roles and Features and it worked

signalR, Hi did you try your server using the websocket.org echo service? socket.io - Error during WebSocket handshake: Unexpected response code socket.io openshift​  If you are not setting transport to signalR.TransportType.WebSockets on your production server, that is what would cause this issue. Even when we use WebSockets, if you have enabled automatic transport negotiation, we have to make two requests to initialize the server (one to get the list of supported transports, then another to actually


If you're behind Nginx, add these three lines (the ones starting with proxy_):

server {       
    listen       443; # Or 80 or whatever
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    ...
}

HTTPS/HTTP is not the issue. WSS will be automatically used on HTTPS pages, and WS used on HTTP, without any manual setting.

Signalr error during websocket handshake: unexpected response , Friday, 13 January 2017. signalR - Error during WebSocket handshake: Unexpected response code: 500. Having recently started playing with  I have a chat application that ran fine while debugging locally with IIS express under visual studio 2017. After I depolyed it into production (Windows server 2012R2 IIS 8.5.9600), the javascript c


Signalr error during websocket handshake unexpected response , Search for jobs related to Signalr error during websocket handshake: unexpected response code: 400 or hire on the world's largest freelancing marketplace with  Im also having a similar issue connecting with with one of the Android library's. Web sockets won't connect to https through either HAproxy doing ssl termination or letting node do ssl directly.


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[PDF] Error During Websocket Handshake Unexpected Response Code 301, Post hosting application on azure , we get following Error in browser Error during WebSocket handshake: Unexpected response code: 500. JavaScript client code that creates a Hub Proxy in a Javascript client. var myHub = $.connection.MyHub; C# server code that maps a route to a PersistentConnection. RouteTable.Routes.MapConnection<MyConnection>("my", "/echo"); C# server code that maps a route to a Hub, or to multiple hubs if you have multiple applications. App.MapSignalR();