Accepting connections in FastAPI - Mini Project: Build & Apply

Accepting connections with FastAPI

📖 Scenario: You are building a simple web server that accepts connections and responds to requests using FastAPI. This server will greet users when they visit the homepage.

🎯 Goal: Create a FastAPI app that accepts connections on the root URL and returns a friendly greeting message.

📋 What You'll Learn

Create a FastAPI app instance named app

Define a GET route for the root path /

Return a JSON response with a message key and value "Hello, visitor!"

Use the @app.get decorator to define the route

💡 Why This Matters

🌍 Real World

Web servers use FastAPI to accept connections and respond to user requests quickly and efficiently.

💼 Career

Knowing how to accept connections and define routes is essential for backend developers working with modern Python web frameworks.

1

Create the FastAPI app instance

Import FastAPI from fastapi and create an app instance called app.

FastAPI

from fastapi import FastAPI

# Create the FastAPI app instance called app
# Your code here

Need a hint?

Use app = FastAPI() to create the app instance.

2

Define a GET route for the root path

Use the @app.get("/") decorator to define a function called read_root that will handle GET requests to the root URL.

FastAPI

from fastapi import FastAPI

app = FastAPI()

# Define a GET route for '/' using @app.get
# Your code here

Need a hint?

Use @app.get("/") above the function definition.

3

Return a greeting message as JSON

Inside the read_root function, return a dictionary with the key message and the value "Hello, visitor!".

FastAPI

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    # Return a JSON response with message 'Hello, visitor!'
    # Your code here

Need a hint?

Return a dictionary with the greeting message.

4

Run the FastAPI app with Uvicorn

Add the code to run the app using uvicorn.run with app as the app instance, host as "127.0.0.1", and port as 8000. Use the if __name__ == "__main__" guard.

FastAPI

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return {"message": "Hello, visitor!"}

# Add code to run the app with uvicorn
# Your code here

Need a hint?

Use uvicorn.run(app, host="127.0.0.1", port=8000) inside the main guard.