Firebase-tools: HTTP request with Express app fails GET

[codeekage]

[REQUIRED] Environment info

firebase-tools: v 6.9.2
nodejs v10.15.3
npm v6.9.0

Platform: Ubuntu

[REQUIRED] Test case

index.ts

import * as functions from 'firebase-functions';
import { app } from './api/hello.api';

export const api = functions.https.onRequest(app)

./api/app.ts

import * as cors from 'cors'
import * as express from 'express'

export const app = express()
app.use(cors())
app.get('/', (req, res)=> {
    try{
        res.send("Hello")
    }catch(error){
        res.send(error)
    }
})

[REQUIRED] Steps to reproduce

npm run serve

[REQUIRED] Expected behaviour

• Execute GET request successfully

[REQUIRED] Actual behavior

• Fails on localhost results to:
  
  
  
  • Cannot GET /<firebase-app-name>/us-central1/api
  
  
• no ERROR in console and debug file.
• Works perfectly on deployment

[google-oss-bot]

This issue does not seem to follow the issue template. Make sure you provide all the required information.

[abeisgoat]

Hmm, I wonder if this has to do with stacking multiple cors() (we pull it in already for Callable requests). I'll investigate today, thanks for the well written report!

[samtstern]

@abeisgoat I bet we just have not done a good job routing requests to function subpaths

[abeisgoat]

Fix is merged in, please re-open if you're still experiencing this once 6.9.3 is out.