Build code HTTP Server FastAPI

Here is a sample code for building an HTTP Server using FastAPI in Python:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return {"Hello": "World"}

@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "q": q}

In this code, we first import the FastAPI module and create an instance of the FastAPI class. We then define two endpoints using the @app.get decorator. The first endpoint is for the root URL ("/") and returns a simple JSON response. The second endpoint is for a URL that includes a variable item_id, and also accepts an optional query parameter q.

To run this code, you can save it in a Python file (e.g. main.py) and then use the following command in the terminal:

uvicorn main:app --reload

This will start the HTTP server on http://localhost:8000/. You can then visit http://localhost:8000/items/42 (or any other item_id value) to see the response from the read_item endpoint.