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def redirect_url(self, request: Request, response: Response) -> URL:
"""
Return the URL for the redirect to follow.
"""
location = response.headers["Location"]
url = URL(location, allow_relative=True)
# Facilitate relative 'Location' headers, as allowed by RFC 7231.
# (e.g. '/path/to/resource' instead of 'http://domain.tld/path/to/resource')
if url.is_relative_url:
url = url.resolve_with(request.url)
# Attach previous fragment if needed (RFC 7231 7.1.2)
if request.url.fragment and not url.fragment:
url = url.copy_with(fragment=request.url.fragment)
return url