Firebase-tools: Cloud function: /<segment>/** rewrite doesn't work

You need to add /api to the start of your express route. Prefixes aren't
chopped off when URLs are sent to the cloud function.

On Sun, Jul 9, 2017, 11:27 PM roosi notifications@github.com wrote:

I have the cloud function

const app = express()

app.get('/ping', (req, res) => {
res.send('pong');
})

exports.api = functions.https.onRequest(app)

and it works fine

https://...cloudfunctions.net/api/ping
pong

Then I add following configuration

{
"hosting": {
"public": "public",
"rewrites": [ {
"source": "/api/**", "function": "api"
} ]
}
}

and try to call it from application url and it fails.

https://...firebaseapp.com/api/ping
404

If I use rewrite all calls to my functions like this

{
"hosting": {
"public": "public",
"rewrites": [ {
"source": "**", "function": "api"
} ]
}
}

then it works

https://...firebaseapp.com/ping
pong

Am I missing something here or isn't this scenario supported?

There is the blog writing about this, which uses and segment in rewrite:

https://firebase.googleblog.com/2017/06/serving-dynamic-content-with-cloud.html
http://url

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@roosi I also ran into this issue last week. It's annoying but the best solution I could come up with for a scenario like this is to create a main function which hosts all other functions and rewrite all hosting calls to it. This enables you to call https://...firebaseapp.com/api/ping, for example.

See my answer here for more details:
https://stackoverflow.com/a/45224176/1309346

I guess that the example at the https://github.com/firebase/functions-samples/blob/master/authorized-https-endpoint is broken too?