Use custom domain for firebase function http calls

Question

Is there a way to use a custom domain for firebase cloud functions http hooks.

The default url for cloud functions looks something like this:

https://us-central1-my-awesome-app.cloudfunctions.net/ios-oauth/

And

I would like to make it look like this:

https://myawesomeapp.com/ios-oauth/

I looked around if there was some other people looking for the same solution and sure enough I found this:

https://stackoverflow.com/questions/43482224/firebase-cloud-functions-custom-domain

Answer 1

I have contacted firebase support to get some answers about this. And I was forwarded to this part in the documentation.

https://firebase.google.com/docs/hosting/functions#create_an_http_function_to_your_hosting_site

You can use your own domain with the firebase-cloud-functions. The way to do is is using the firebase-hosting.

1. Connect custom domain to firebase hosting

2. Add custom function routing to firebase.json

   {   "hosting": {     "public": "public",      // Add the following rewrites section *within* "hosting"     "rewrites": [{       "source": "/bigben", "function": "bigben"     }]    } } 

3. Deploy to firebase

Answer 2

The accepted answer is correct, and I created this repository last year to demonstrate the functionality: https://github.com/cjmyles/firebase-react-express

In order to retain the HTML pushState functionality as per https://firebase.google.com/docs/hosting/full-config#rewrites you may want to extend the rules to allow all other requests through to your index.html page, which solves the issue @Boris was facing in his answer.

"rewrites": [     {         "source": "/api/**",         "function": "app"     },     {         "source": "!/@(api)/**",         "destination": "/index.html"     } ] 

This shouldn't really be needed as the rewrite rules are meant to match the first occurence of a request (so the order matters), but this worked for me by allowing all non-api related requests through.

Please note: At the time of writing this the Firebase documentation states: Firebase Hosting supports Cloud Functions in us-central1 only.