chromium/src/third_party/blink/web_tests/external/wpt/content-security-policy/navigate-to/support/redirect_to_post_message_to_frame_owner.py

def main(request, response):
    response.status = 302
    if b"location" in request.GET:
        response.headers.set(b"Location", request.GET[b"location"])
    else:
        response.headers.set(b"Location", b"post_message_to_frame_owner.html")