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I just finished the Hello World Google Cloud Functions tutorial and received the following response headers:

Connection → keep-alive

Content-Length → 14

Content-Type → text/plain; charset=utf-8

Date → Mon, 29 Feb 2016 07:02:37 GMT

Execution-Id → XbT-WC9lXKL-0

Server → nginx

 How can I add the CORS headers to be able to call my function from my website?


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I will start with the assumption that you already know how to set up a cloud function. For instance, let’s say your cloud function calls a third-party API to fetch some data and uses/ filters it in some way before sending it to you. Me being a fan of Space X, let's say I will be fetching data about the next Space X launch.

import flask

import requests

def getUserDetails(request):

user = requests.get(''


response = flask.jsonify(user)

response.headers.set('Access-Control-Allow-Origin', '*')

response.headers.set('Access-Control-Allow-Methods', 'GET, POST')

return response

As you can see in these two lines.

response.headers.set('Access-Control-Allow-Origin', '*') response.headers.set('Access-Control-Allow-Methods', 'GET, POST')

I’m setting the CORS to allow all origins ( of course you can change this ). And they only allow GET and POST methods.

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