HTTP Trigger using octet stream

Question

Is it possible to create an Azure Functions HTTP trigger that uses application/octet-stream instead of application/json?

I currently have a trigger that for application/json.

Answer 1

In order to stream the data in HTTP Trigger as stream:-

According to this Github document, You can edit your function.json file of your HTTP Trigger with data type as binary or stream to stream the data like below:-

function.json code:-

{

"generatedBy": "Microsoft.NET.Sdk.Functions.Generator-4.1.1",

"configurationSource": "attributes",

"bindings": [

{

"type": "httpTrigger",

"direction": "in",

"dataType": "stream",

"route": "myroute",

"methods": [

"post"

],

"authLevel": "function",

"name": "req"

}

],

"disabled": false,

"scriptFile": "../bin/FunctionApp9.dll",

"entryPoint": "MyFunction.RunAsync"

}

Additionally according to this SO Thread answer by Andy, By referring Andy's code, I got the below output in my browser after I ran the HTTP trigger:- Here response.ContentType is set to "application/json-data-stream";

Andy's Code:- Function.cs:-

using Microsoft.AspNetCore.Mvc; using Microsoft.Azure.WebJobs; using
Microsoft.Azure.WebJobs.Extensions.Http; using
Microsoft.AspNetCore.Http; using Microsoft.Extensions.Logging; using
Newtonsoft.Json; using System.Collections.Generic;

namespace FunctionApp10 {
    public class Function1
    {
        private async IAsyncEnumerable<string> GetDataAsync()
        {
            for (var i = 0; i < 100; ++i)
            {
                yield return "{\"hello\":\"world\"}";
            }
        }

        [FunctionName("Function1")]
        public async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            var response = req.HttpContext.Response;

            await using var sw = new StreamWriter(response.Body);
            await foreach (var msg in GetDataAsync())
            {
                await sw.WriteLineAsync(msg);
            }

            await sw.FlushAsync();

            response.StatusCode = 200;
            response.ContentType = "application/json-data-stream";

            return new EmptyResult();
        }
    }
  } 

Output:- Trigger got executed:-

Got streamed response in the Browser like below:-