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def main(request, response):
service_worker_header = request.headers.get(b'service-worker')
if b'header' in request.GET and service_worker_header != b'script':
return 400, [(b'Content-Type', b'text/plain')], b'Bad Request'
if b'no-header' in request.GET and service_worker_header == b'script':
return 400, [(b'Content-Type', b'text/plain')], b'Bad Request'
# no-cache itself to ensure the user agent finds a new version for each
# update.
headers = [(b'Cache-Control', b'no-cache, must-revalidate'),
(b'Pragma', b'no-cache'),
(b'Content-Type', b'application/javascript')]
body = b'/* This is a service worker script */\n'
if b'import' in request.GET:
body += b"importScripts('%s');" % request.GET[b'import']
return 200, headers, body