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chromium/third_party/blink/web_tests/external/wpt/workers/same-site-cookies/resources/set_cookies.py 

from cookies.resources.helpers import makeCookieHeader, setNoCacheAndCORSHeaders

def main(request, response):
    headers = setNoCacheAndCORSHeaders(request, response)
    headers[0] = (b"Content-Type", b"text/html; charset=utf-8")
    headers.append(makeCookieHeader(b"samesite_strict_set_before_load", b"test", {b"SameSite":b"Strict", b"path":b"/", b"Secure":b""}))
    headers.append(makeCookieHeader(b"samesite_lax_set_before_load", b"test", {b"SameSite":b"Lax", b"path":b"/", b"Secure":b""}))
    headers.append(makeCookieHeader(b"samesite_none_set_before_load", b"test", {b"SameSite":b"None", b"path":b"/", b"Secure":b""}))
    document = b"<!DOCTYPE html>"
    return headers, document