CORS Proxy calls with Cloud Functions

git clone [email protected]:7kfpun/cors-proxy.git

Create a Firebase Project on the Firebase Console.

Set up your Firebase project by running firebase use --add, select your Project ID and follow the instructions.

You need to have installed the Firebase CLI. If you haven't run:

npm install -g firebase-tools

Doesn't work? You may need to change npm permissions.

First you need to install the npm dependencies of the functions:

cd functions && npm install; cd ..

This installs locally:

• The Firebase SDK and the Firebase Functions SDK.
• The cors npm package to allow Cross Origin AJAX requests on the endpoint.
• The node-fetch npm package to bring window.fetch to Node.js.

Deploy to Firebase using the following command:

firebase deploy

This deploys and activates the cors Function.

The first time you call firebase deploy on a new project with Functions will take longer than usual.

After deploying the function you can open the following URLs in your browser:

curl https://us-central1-<project-id>.cloudfunctions.net/cors?url=https%3A%2F%2Fapi.ipify.org%3Fformat%3Djson

You can also send the format in the request body. For instance using cURL in the command line:

curl -X POST \
  -H 'Content-Type: application/json' \
  -d '{"url": "https://api.ipify.org/?format=json"}' \
  https://us-central1-<project-id>.cloudfunctions.net/cors

Released under the MIT License.