Azure Functions triggers and bindings concepts

The HTTP trigger (HttpTrigger) is defined on the Run method for a function named HttpExample that returns a MultiResponse object:

        [Function("HttpExample")]
        public static MultiResponse Run([HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequestData req,
            FunctionContext executionContext)
        {

This example shows the MultiResponse object definition which both returns an HttpResponse to the HTTP request and also writes a message to a storage queue using a QueueOutput binding:

    public class MultiResponse
    {
        [QueueOutput("outqueue",Connection = "AzureWebJobsStorage")]
        public string[] Messages { get; set; }
        public HttpResponseData HttpResponse { get; set; }
    }

For more information, see the C# isolated worker model guide.

The HTTP trigger (HttpTrigger) is defined on the Run method for a function named HttpExample that writes to a storage queue defined by the Queue and StorageAccount attributes on the msg parameter:

        [FunctionName("HttpExample")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req, 
            [Queue("outqueue"),StorageAccount("AzureWebJobsStorage")] ICollector<string> msg, 
            ILogger log)
        {

For more information, see the C# in-process model guide.

In Node.js for Functions version 4, you configure triggers and bindings using objects exported from the @azure/functions module. For more information, see the Node.js developer guide.

In Node.js for Functions version 3, you configure triggers and bindings in a function-specific function.json file in the same folder as your code. For more information, see the Node.js developer guide.

The http method on the exported app object defines an HTTP trigger, and the storageQueue method on output defines an output binding on this trigger.

const { app, output } = require('@azure/functions');

const queueOutput = output.storageQueue({
    queueName: 'outqueue',
    connection: 'MyStorageConnectionAppSetting',
});

app.http('httpTrigger1', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    extraOutputs: [queueOutput],
    handler: async (request, context) => {
        const body = await request.text();
        context.extraOutputs.set(queueOutput, body);
        return { body: 'Created queue item.' };
    },
});

This example function.json file defines the HTTP trigger function that returns an HTTP response and writes to a storage queue.

{
  "bindings": [
    {
      "type": "httpTrigger",
      "direction": "in",
      "authLevel": "function",
      "name": "input"
    },
    {
      "type": "http",
      "direction": "out",
      "name": "$return"
    },
    {
      "type": "queue",
      "direction": "out",
      "name": "myQueueItem",
      "queueName": "outqueue",
      "connection": "MyStorageConnectionAppSetting"
    }
  ]
}

The http method on the exported app object defines an HTTP trigger, and the storageQueue method on output defines an output binding on this trigger.

import { app, HttpRequest, HttpResponseInit, InvocationContext, output } from '@azure/functions';

const queueOutput = output.storageQueue({
    queueName: 'outqueue',
    connection: 'MyStorageConnectionAppSetting',
});

export async function httpTrigger1(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
    const body = await request.text();
    context.extraOutputs.set(queueOutput, body);
    return { body: 'Created queue item.' };
}

app.http('httpTrigger1', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    extraOutputs: [queueOutput],
    handler: httpTrigger1,
});

This example function.json file defines the HTTP trigger function that returns an HTTP response and writes to a storage queue.

{
  "bindings": [
    {
      "type": "httpTrigger",
      "direction": "in",
      "authLevel": "function",
      "name": "input"
    },
    {
      "type": "http",
      "direction": "out",
      "name": "$return"
    },
    {
      "type": "queue",
      "direction": "out",
      "name": "myQueueItem",
      "queueName": "outqueue",
      "connection": "MyStorageConnectionAppSetting"
    }
  ]
}

In Python for Functions version 2, you define the function directly in code using decorators.

app = func.FunctionApp(http_auth_level=func.AuthLevel.ANONYMOUS)

@app.route(route="HttpExample")
@app.queue_output(arg_name="msg", queue_name="outqueue", connection="AzureWebJobsStorage")
def HttpExample(req: func.HttpRequest, msg: func.Out [func.QueueMessage]) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

In Python for Functions version 1, this example function.json file defines an HTTP trigger function that returns an HTTP response and writes to a storage queue.

    {
      "authLevel": "function",
      "type": "httpTrigger",
      "direction": "in",
      "name": "Request",
      "methods": [
        "get",
        "post"
      ]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "Response"
    },
    {
      "type": "queue",
      "direction": "out",
      "name": "msg",
      "queueName": "outqueue",
      "connection": "AzureWebJobsStorage"
    }
  ]
}