Method rebuild_proxies

src/requests/sessions.py:334–368

This method re-evaluates the proxy configuration by considering the environment variables. If we are redirected to a URL covered by NO_PROXY, we strip the proxy configuration. Otherwise, we set missing proxy keys for this URL (in case they were stripped by a previous

(
        self,
        prepared_request: PreparedRequest,
        proxies: dict[str, str] | None,
    )

            prepared_request.prepare_auth(new_auth)

    def rebuild_proxies(
        self,
        prepared_request: PreparedRequest,
        proxies: dict[str, str] | None,
    ) -> dict[str, str]:
        """This method re-evaluates the proxy configuration by considering the
        environment variables. If we are redirected to a URL covered by
        NO_PROXY, we strip the proxy configuration. Otherwise, we set missing
        proxy keys for this URL (in case they were stripped by a previous
        redirect).

        This method also replaces the Proxy-Authorization header where
        necessary.

        :rtype: dict
        """
        assert _is_prepared(prepared_request)
        headers = prepared_request.headers
        scheme = urlparse(prepared_request.url).scheme
        new_proxies = resolve_proxies(prepared_request, proxies, self.trust_env)

        if "Proxy-Authorization" in headers:
            del headers["Proxy-Authorization"]

        try:
            username, password = get_auth_from_url(new_proxies[scheme])
        except KeyError:
            username, password = None, None

        # urllib3 handles proxy authorization for us in the standard adapter.
        # Avoid appending this to TLS tunneled requests where it may be leaked.
        if not scheme.startswith("https") and username and password:
            headers["Proxy-Authorization"] = _basic_auth_str(username, password)

        return new_proxies

    def rebuild_method(
        self, prepared_request: PreparedRequest, response: Response