export-on-load-script.py

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import datetime

def main(request, response):

    # This script serves both preflight and main GET request for cross-origin

    # static imports from module service workers.

    # According to https://w3c.github.io/ServiceWorker/#update-algorithm,

    # `Service-Worker: script` request header is added, which triggers CORS

    # preflight.

    response_headers = [(b"Content-Type", b"text/javascript"),

                        (b"Access-Control-Allow-Origin", b"*"),

                        (b"Access-Control-Allow-Headers", b"Service-Worker")]

    body = b"export const importedModules = ['export-on-load-script.js'];"

    body += b"// %d" % datetime.datetime.now().timestamp()

    return (200, response_headers, body)