Can't connect from React Native

[siberianguy]

I'm using in React Native the same code that works perfectly fine from a web js client but get an error: Failed to start the transport 'WebSockets': null. So it seems like SignalR doesn't find any transports (I did not specify any transport explicitly). I've looked through other issues and I've got an impression SignalR is supposed to be working from React Native at this point. Is it the case?

[bradygaster]

Are you trying to connect to a Hub running on the server in ASP.NET Core or are you trying to connect to the Azure SignalR Service? If it's the former, are you running your Hub(s) in Azure App Service?

Thanks!

[siberianguy]

Just normal ASP.NET Core Web Api hosted in IIS

[bradygaster]

Do you have WebSockets installed on your IIS Server? That doesn't come pre-installed AFAIK and you need to add it as an optional component.

[siberianguy]

Sure. As I pointed out in the original message, our web frontend is working with the same Web Socket, so it's definitely functioning

[mikaelm12]

Can you get some logs for us? https://github.com/aspnet/SignalR/wiki/Diagnostics-Guide

[qafuturex]

This is screenshot what i faced.

[mikaelm12]

This doesn't really give much more information. More detailed logging would be helpful

[qafuturex]

import { HubConnectionBuilder,HubConnection } from '@aspnet/signalr'
...
initiateConnection = () => {
connection = new HubConnectionBuilder()
.withUrl(config.baseHubURL)
.build();

  connection.on("update", (message) => {
  this.update(message);
});

}
The issue that failed to start the transport is happening in new HubConnectionBuilder().withURl().build().

[qafuturex]

@mikaelm12 what exactly do you need?