Functions with HTTP triggers in Azure - Mini Project: Build & Apply

Create an Azure Function with HTTP Trigger

📖 Scenario: You are building a simple Azure Function that responds to HTTP requests. This function will greet users by name when they send a request with their name.

🎯 Goal: Build an Azure Function with an HTTP trigger that reads a name parameter from the query string and returns a greeting message.

📋 What You'll Learn

Create a function named HttpTriggerFunction with an HTTP trigger.

Configure the function to accept GET requests.

Read the name parameter from the query string.

Return a greeting message including the name parameter.

💡 Why This Matters

🌍 Real World

Azure Functions with HTTP triggers are commonly used to build serverless APIs that respond to web requests without managing servers.

💼 Career

Understanding how to create and configure HTTP-triggered Azure Functions is essential for cloud developers and DevOps engineers working with serverless architectures.

1

Create the function.json file with HTTP trigger

Create a file named function.json with an HTTP trigger binding. Set the authLevel to function and allowed methods to ["get"].

Azure

{
  // Define the HTTP trigger binding here
  // Your code here
}

Need a hint?

The function.json file defines the trigger and output bindings for your Azure Function.

2

Create the function code file with the main function

Create a file named __init__.py and define a function named main that accepts parameters req and context. Import func from azure.functions.

Azure

import azure.functions as func

# Define the main function with parameters req and context
# Your code here

Need a hint?

The main function is the entry point for your Azure Function.

3

Read the 'name' parameter from the HTTP request

Inside the main function, read the name parameter from the query string using req.params.get('name'). Store it in a variable called name.

Azure

import azure.functions as func

def main(req: func.HttpRequest, context: func.Context) -> func.HttpResponse:
    # Get the 'name' parameter from the query string
    # Your code here

Need a hint?

Use req.params.get('name') to get the query parameter.

4

Return a greeting message in the HTTP response

Complete the main function to return an HttpResponse with the message "Hello, {name}!" if name is provided. If name is missing, return "Please pass a name on the query string." with status code 400.

Azure

import azure.functions as func

def main(req: func.HttpRequest, context: func.Context) -> func.HttpResponse:
    name = req.params.get('name')
    # Return greeting or error message
    # Your code here

Need a hint?

Use an if statement to check if name exists and return the appropriate HttpResponse.