Why am I getting 404 when I run my Azure Function locally?

I have set up a very simple Azure Function in C # for the answer to HttpTrigger

. When I run the function locally following the Microsoft Azure instruction , all I get is an empty 404 response.

I am using Visual Studio 2017 v15.3 Preview with . This is the code for my Azure Function:

[FunctionName("Func1")]        
public static async Task<object> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, WebHookType = "genericJson")]
    HttpRequestMessage req, 
    TraceWriter log)
{
    return req.CreateResponse(HttpStatusCode.OK);
}

      

        
        
        
      

    

When I run it locally (by right clicking the VS project and going to Debug> Start New Instance) it seems to start just fine. My function is recognized and the URL is http: // localhost: 7071 / api / Func1

However, when I receive or send a message to the above URL (with the Content-Type header set to "application / json"), I return an empty 404 response. The Azure CLI Console outputs:

[6/12/2017 12:26:12 PM] Making HTTP request: {

[6/12/2017 12:26:12 PM] "requestId": "ae247ea6-c055-40f5-a09c-40ea207cc785",

[6/12/2017 12:26:12 PM] "method": "GET",

[6/12/2017 12:26:12 PM] "uri": "/ api / Func1"

[6/12/2017 12:26:12 PM]}

[6/12/2017 12:26:12 PM] Completed HTTP request: {

[6/12/2017 12:26:12 PM] "requestId": "ae247ea6-c055-40f5-a09c-40ea207cc785",

[6/12/2017 12:26:12 PM] "method": "GET",

[6/12/2017 12:26:12 PM] "uri": "/ api / Func1",

[6/12/2017 12:26:12 PM] "authorizationLevel": "Anonymous"

[6/12/2017 12:26:12 PM]}

[6/12/2017 12:26:12 PM] Answer details: {

[6/12/2017 12:26:12 PM] "requestId": "ae247ea6-c055-40f5-a09c-40ea207cc785",

[6/12/2017 12:26:12 PM] "status": "NotFound"

[6/12/2017 12:26:12 PM]}

Why am I getting 404 and how can I fix it?