How to call one function app from another locally?

Question

In Visual Studio, I have created 2 Azure function apps f1 and f2.

I have already change the port for both function apps.

I want to call f2 from f1 but I'm getting a NotFound error.

f1 is using http://localhost:999/demo1
f2 is using http://localhost:1212/demo2

Are they function apps within the same solution or different solutions? — Chris, Feb 14 '20 at 15:17
What type of triggers? Maybe an example of how you've written your functions (primarily interested in the bindings and attributes). — Kristin, Feb 14 '20 at 15:32

score 2 · Accepted Answer · answered Feb 14 '20 at 16:47

I have tried calling one Function to Another Function within the same project and different project too both works fine.

Function 1 Example:

 [FunctionName("Function1")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
        ILogger log)
    {
        log.LogInformation("C# HTTP trigger function processed a request.");
        try
        {
            //Extract Request Param

            var content = await new StreamReader(req.Body).ReadToEndAsync();
            QnAMakerQuestion objQnAMakerQuestion = JsonConvert.DeserializeObject<QnAMakerQuestion>(content);

            //Global Variable for containing message

            dynamic validationMessage;

            // Validate param

            if (string.IsNullOrEmpty(objQnAMakerQuestion.question))
            {
                validationMessage = new OkObjectResult("Question is required!");
                return (IActionResult)validationMessage;
            }
            //Selialize Request Param
            var json = JsonConvert.SerializeObject(objQnAMakerQuestion);
            var stringContent = new StringContent(json, UnicodeEncoding.UTF8, "application/json");
            // Call Function 2 
            HttpClient newClient = new HttpClient();
            HttpResponseMessage responseFromAnotherFunction = await newClient.PostAsync("http://localhost:7073/api/Function2FromApp2", stringContent);
            dynamic response = "";

            if (responseFromAnotherFunction.IsSuccessStatusCode)
            {
                response = responseFromAnotherFunction.Content.ReadAsStringAsync().Result;
            }

            validationMessage = new OkObjectResult(response);
            return (IActionResult)validationMessage;
        }
        catch (Exception ex)
        {
            dynamic validationMessage = new OkObjectResult(string.Format("Something went wrong, please try agian! Reason:{0}", ex.Message));
            return (IActionResult)validationMessage;
        }
    }

Function 2 Example:

  [FunctionName("Function2FromApp2")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            try
            {
                var content = await new StreamReader(req.Body).ReadToEndAsync();
                QnAMakerQuestion objQnAMakerQuestion = JsonConvert.DeserializeObject<QnAMakerQuestion>(content);

                //Global Variable for containing message

                dynamic validationMessage;

                // Validate param

                if (string.IsNullOrEmpty(objQnAMakerQuestion.question))
                {
                    validationMessage = new OkObjectResult("Question is required!");
                    return (IActionResult)validationMessage;
                }
                validationMessage = new OkObjectResult(objQnAMakerQuestion);
                return (IActionResult)validationMessage;
            }
            catch (Exception ex)
            {

                dynamic validationMessage = new OkObjectResult(string.Format("Something went wrong, please try agian! Reason:{0}", ex.Message));
                return (IActionResult)validationMessage;
            }
        }

Class Used:

   public class QnAMakerQuestion
    {
        public string question { get; set; }

    }

Note: If you run in same project then you wouldn't encounter any problem. But if you run in different project encounter a issue regarding port. To resolve that in local.settings.json file replace below code :

"Host": {

    "LocalHttpPort": 7073

  }

And Update Project Properties -> Debug to following

host start --port 7073 --pause-on-error See the screen shot below:

Post Man Test:

I have invoked Function 1 on PostMan it Invoked Function 1 as Function 1 Invoked Function 2 and Send Response or vice-versa from function 2 to function 1. See the screen shot below:

Just plug and play, let me know if you have any additional question.

How to call one function app from another locally?

1 Answers1