问题
I have dynamically generated urls that I need to create for staging and production environments. I am doing a mix of Firebase hosting and functions. I am also using Firebase config to route urls to my Firebase functions "app". When I try to get the hosting url when I visit my site with req.get('host') inside a Firebase function I get the functions url. How can I get the Hosting url? - the url that triggered the firebase function?
回答1:
If you examine the contents of req.headers, you'll find some attributes of interest:
host: The host of Cloud Functions, e.g. "us-central1-YOUR-PROJECT.cloudfunctions.net:x-forwarded-host: Your Firebase Hosting host, e.g. "YOUR-PROJECT.firebaseapp.com"x-forwarded-proto: The protocol of the original request, e.g. "https"x-original-url: The URL path of the original request, e.g. "/test"
Between three of those (the ones that start with "x-"), you could concatenate them together to get the original URL.
I don't know if these headers are fully documented and supported.
回答2:
As far as I know the original URL that the user typed is not available in the request that you get in Cloud Functions. The rewrite happens on a different server, and no information is passed along.
来源：https://stackoverflow.com/questions/51195552/how-can-i-get-the-hosting-url-instead-of-functions-url-in-firebase-functions-for