Azure Functions Web API Sample

What is an Azure Functions Web API?

Azure Functions provides a serverless compute service that enables you to run small pieces of code, or "functions," in the cloud without having to manage infrastructure. Creating a Web API with Azure Functions allows you to build HTTP-triggered endpoints that can serve data, handle requests, and integrate with other services.

This sample demonstrates a basic HTTP-triggered Azure Function that acts as a simple Web API endpoint.

Key Features

Sample API Endpoint

This sample includes a simple HTTP-triggered function that returns a welcome message. You can test it by making a GET request to the endpoint.

Endpoint: GET /api/greeting

Example Usage:

curl https://your-azure-function-app.azurewebsites.net/api/greeting

Expected Response:

{
    "message": "Hello from Azure Functions Web API!"
}

Code Snippet (C# Example)

Here's a glimpse of what the C# code for a basic HTTP-triggered function might look like:

using System;
using System.IO;
using System.Threading.Tasks;
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;

namespace AzureFunctions.Samples.WebAPI
{
    public static class GreetingFunction
    {
        [FunctionName("Greeting")]
        public static async Task Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "greeting")] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            string name = req.Query["name"];

            string responseMessage = string.IsNullOrEmpty(name)
                ? "Hello from Azure Functions Web API!"
                : $"Hello, {name}! This is Azure Functions Web API.";

            return new OkObjectResult(new { message = responseMessage });
        }
    }
}

Getting Started

To build and deploy your own Azure Functions Web API, you can:

• Use the Azure portal for simple functions.
• Use Visual Studio or VS Code with the Azure Functions extension for a richer development experience.
• Deploy using Azure CLI, Azure DevOps, or GitHub Actions.