Cannot run Azure Durable Function locally via Visual Studio Code

Question

I followed the tutorial Visual Studio Code quickstart and created a durable function locally. I got an error message when my durable function executed await client.startNew inside the starter function

const instanceId = await client.startNew(req.params.functionName, undefined, req.body);

Here is the error messages:

Executed 'Functions.HttpTrigger' (Failed, Id=84dc103d-bef9-4450-b4c6-9e612c6dc263) System.Private.CoreLib: Exception while executing function: Functions.HttpTrigger. System.Private.CoreLib: Result: Failure Exception: Error: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:827: Stack: Error: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:827: at _errnoException (util.js:992:11) at WriteWrap.afterWrite [as oncomplete] (net.js:864:14).

My environment:

Azure Functions Core Tools (2.3.148)
Function Runtime Version(2.0.12210.0)
Node.js 8

Here is my code just copied from the tutorial.

const df = require("durable-functions");
module.exports = async function (context, req) {
        const client = df.getClient(context);
        const instanceId = await client.startNew(req.params.functionName, undefined, req.body);

        context.log(`Started orchestration with ID = '${instanceId}'.`);

        return client.createCheckStatusResponse(context.bindingData.req, instanceId);
    };

{
  "bindings": [
    {
      "authLevel": "anonymous",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in",
      "route": "orchestrators/{functionName}",
      "methods": ["post"]
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "starter",
      "type": "orchestrationClient",
      "direction": "in"
    }
  ]
}

How do I resolve this problem?

Jerry Liu Jerry Liu · Accepted Answer · 2018-12-19T07:07:12

Update

The problem has been fixed since npm package durable-functions v1.1.3

You have met a known issue.

This is due to current IWebHookProvider implementation, which causes the DurableOrchestrationClient class to use the wrong webhook URLs. The workaround is to set local environment variable WEBSITE_HOSTNAME to localhost:, ex. localhost:7071

If VS Code has been opened before env setting, don't forget to restart it to bring new env variable into effect.

Cannot run Azure Durable Function locally via Visual Studio Code

2 Answers