Function get_proxy

src/requests/utils.py:819–820

(key: str)

    # Prioritize lowercase environment variables over uppercase
    # to keep a consistent behaviour with other http projects (curl, wget).
    def get_proxy(key: str) -> str | None:
        return os.environ.get(key) or os.environ.get(key.upper())

    # First check whether no_proxy is defined. If it is, check that the URL
    # we're getting isn't in the no_proxy list.