12 - Header Parameters

Use Header from FastAPI to work with HTTP headers.

from fastapi import FastAPI, Header

@app.get("/items13/")
async def read_items(user_agent: Annotated[str | None, Header()] = None):
    return {"User-Agent": user_agent}

Note that the hyphen in User-Agent is converted to an underscore when it is converted to a variable user_agent.

import requests
url = 'http://127.0.0.1:8000'

requests.get(url + '/items13', headers={'User-Agent': 'Michael Moen'}).json()

{'User-Agent': 'Michael Moen'}