testing/web-platform/tests/service-workers/service-worker/resources/404.py


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# iframe does not fire onload event if the response's content-type is not
# text/plain or text/html so this script exists if you want to test a 404 load
# in an iframe.
def main(req, res):
    return 404, [(b'Content-Type', b'text/plain')], b"Page not found"