Azure Function binding error for signalR (negotiate function) (500 error code)

Question

I'm creating a live chat using Azure functions and signalR. It works perfectly fine locally, but the deployed "negotiate" function does not work.

negotiate function (index.js)

module.exports = function (context, req, connectionInfo) {
    context.res = { body: connectionInfo };
    context.done();
}

config file (function.json)

{
    "disabled": false,
    "bindings": [
      {
        "authLevel": "anonymous",
        "type": "httpTrigger",
        "direction": "in",
        "name": "req"
      },
      {
        "type": "http",
        "direction": "out",
        "name": "res"
      },
      {
        "type": "signalRConnectionInfo",
        "name": "connectionInfo",
        "hubName": "chat",
        "direction": "in",
        "connectionStringSetting": "AzureSignalRConnectionString"
      }
    ]
  }

AzureSignalRConnectionString is set in function app properties. I also tried using "connectionString" instead of "connectionStringSetting" and using the connection string instead of "AzureSignalRConnectionString" reference, and all 4 possible combinations we have here.

If I run the function in Azure portal, I get this error:

[Error] Executed 'Functions.negotiate' (Failed, Id=0ac24b1f-1ab0-40f5-9680-34db547e1cc9)
Unable to resolve the value for property 'SignalRConnectionInfoAttribute.ConnectionStringSetting'. Make sure the setting exists and has a valid value

Answer 1

Did you write "connectionStringSetting" as the attribute name in your code? If so, could you please have a try to change it to "ConnectionStringSetting". You may refer to this tutorial or the screenshot I post below:

Answer 2

Solved (got an answer on https://social.msdn.microsoft.com/ ). I should have added the AzureSignalRConnectionString in FunctionApp/Configuration/Application settings instead of FunctionApp/Configuration/Application settings/Connection strings.