Azure Http Triggers function calls

Question

I would like a Http Trigger function to call another Http Trigger function. Basically, I am trying to access via the URL (HTTP request) the Trigger 1, which that Trigger 1 will call Trigger 2. What I am thinking is to put the fix URL for Trigger 2, so you just call Trigger 1. Any ideas how to do that?

using System.Net;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
    log.Info("C# HTTP trigger function processed a request.");

    // parse query parameter
    string name = req.GetQueryNameValuePairs()
        .FirstOrDefault(q => string.Compare(q.Key, "name", true) == 0)
        .Value;

    // Get request body
    dynamic data = await req.Content.ReadAsAsync<object>();

    // Set name to query string or body data
    name = name ?? data?.name;

    return name == null
        ? req.CreateResponse(HttpStatusCode.BadRequest, "Please pass a name on the query string or in the request body")
        : req.CreateResponse(HttpStatusCode.OK, "Hello " + name);
}

Any help is much appreciated.

using webrequest it should work ? I tried but is not working — Justin B., Nov 23 '17 at 22:59
Don't put a standard example into your answer. Instead, show what you tried yourself to solve this problem. — Mikhail Shilkov, Nov 23 '17 at 23:12
I have tried WebRequest webRequest = WebRequest.Create("https://testing.azurewebsites.net/api/HttpTriggerCSharp1?name=testing"); WebResponse webResp = webRequest.GetResponse(); — Justin B., Nov 23 '17 at 23:18

Mikhail Shilkov · Accepted Answer · 2017-11-23T23:24:04.153

12

You can use HttpClient to do a normal HTTP request. Here is what the calling function could look like:

static HttpClient client = new HttpClient();
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req)
{
    var url = "https://<functionapp>.azurewebsites.net/api/Function2?code=<code>";
    var response = await client.GetAsync(url);
    string result = await response.Content.ReadAsStringAsync();
    return req.CreateResponse(HttpStatusCode.OK, "Function 1 " + result);
}

edited Nov 23 '17 at 23:24

answered Nov 23 '17 at 23:11

Mikhail Shilkov

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error CS1061: 'HttpResponseMessage' does not contain a definition for 'content' and no extension method 'content' accepting a first argument of type 'HttpResponseMessage' could be found (are you missing a using directive or an assembly reference?) – Justin B. Nov 23 '17 at 23:23
using System.Net; using System.Net.Http; using System.Web.Http.Controllers; static HttpClient client = new HttpClient(); public static async Task Run(HttpRequestMessage Request) { var url = "https://"; var response = await client.GetAsync(url); string result = await response.Content.ReadAsStringAsync(); return Request.CreateResponse(HttpStatusCode.OK, "Function 1 " + result); } – Justin B. Nov 23 '17 at 23:46
I tried the above in azure functions still an error. Can you please help on that? – Justin B. Nov 23 '17 at 23:47
Is your binding name `Request`? It's `req' by default. Otherwise code is correct. Which error you get? – Mikhail Shilkov Nov 24 '17 at 06:41

score 0 · Answer 2 · answered May 16 '18 at 08:46

0

I think you should use Durable Functions instead:

public static async Task<object> Run(DurableOrchestrationContext ctx)
{
    var x = await ctx.CallActivityAsync<object>("YourOtherFunctionName");
    // Rest of Function code
}

answered May 16 '18 at 08:46

Kapé

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This is technically correct and probably the preferred way but only if your Function App is running on version 2.x – CodeAlchemist Jul 19 '19 at 21:58

score 0 · Answer 3 · answered Nov 12 '21 at 09:06

0

This works for me

var url ="azure function URL with code and params";
using var client = new HttpClient();
client.GetAsync(url).Wait();

answered Nov 12 '21 at 09:06

Muflix

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Azure Http Triggers function calls

3 Answers3