问题
How can I send custom HTTP headers with a bucket backend for Cloud CDN without the x-goog-meta- prefix?
In particular, I'm trying to send a Content-Security-Policy header, which turns into x-goog-meta-Content-Security-Policy and thus is ignored by the browser.
Screenshot: Google Storage/ Bucket Meta data UI
Screenshot: Response headers
来源：https://stackoverflow.com/questions/43853564/custom-http-headers-with-google-cloud-cdn-and-bucket-backend