How I Handle API Authentication in Every Project (My Exact Pattern)

The problem: every project reinvents API auth I've built 77+ API integrations. Each time, I used to write auth handling from scratch. Token refresh? Copy-paste. API key rotation? Rewrite. OAuth flow? Start over. Then I standardized on ONE pattern. Now I copy it into every project and it just works. The Universal Auth Pattern import httpx import time from dataclasses import dataclass from typing import Optional @dataclass class AuthConfig : """ Works with API keys, Bearer tokens, and OAuth. """ api_key : Optional [ str ] = None bearer_token : Optional [ str ] = None oauth_client_id : Optional [ str ] = None oauth_client_secret : Optional [ str ] = None oauth_token_url : Optional [ str ] = None _cached_token : Optional [ str ] = None _token_expires : float = 0 def get_headers ( self ) -> dict : if self . api_key : return { ' X-API-Key ' : self . api_key } if self . bearer_token : return { ' Authorization ' : f ' Bearer { self . bearer_token } ' } if self . oauth_client_id : token = self