Asynchronous Web Development with Sanic

Introduction

Sanic is a web framework for Python that is designed for fast HTTP responses. It supports asynchronous request handling, making it suitable for applications that require handling many simultaneous requests with high performance.

Installation

pip install sanic

Key Concepts

• Asynchronous Programming: Allows multiple concurrent tasks to run without blocking each other.
• Route Handlers: Functions that define how to respond to specific HTTP requests.
• Middleware: Code that runs before or after route handlers to process requests and responses.

Creating a Basic App

Here is a simple example of a Sanic application:

from sanic import Sanic
from sanic.response import json

app = Sanic("MyApp")

@app.route("/")
async def test(request):
    return json({"hello": "world"})

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8000)
            

Handling Requests

Sanic allows handling different types of HTTP methods. Below is an example of handling GET and POST requests:

@app.route("/data", methods=["POST"])
async def post_data(request):
    data = request.json
    return json({"received": data})
            

Middleware

Middleware can be used for various purposes such as logging requests, handling CORS, etc. Here is an example of a simple middleware:

@app.middleware("request")
async def add_header(request):
    request.headers["X-My-Custom-Header"] = "Value"
            

Best Practices

• Use async functions to define route handlers.
• Utilize middleware for common functionalities.
• Structure your application to separate business logic from route handling.

FAQ