Google Api Gateway with Cloud Run CORS

Question

Is there a way to enable Cors in the Google Api gateway config for Cloud Run services?

I enabled Cors in the service themselves, but I always get

Access to XMLHttpRequest at 'xxx' from origin 'http://localhost:4200/' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Wondering if the Api Gateway is the problem, because calling the cloud run service directly works fine.

Answer 1

You could overcome the missing functionality

• by adding a load balancer
• create a custom header Guide

You just need to add the "Access-Control-Origin" header:

Allow all

Access-Control-Origin:'*'

See steps for API Gateway and Load balancer.

Answer 2

Adding options for the path fixes the issue

x-google-endpoints:
  - name: ...name here...
    allowCors: True
paths:
  /tasks:
    post:
      ...
    options:
      description: "Cors associated request to tasks"
      operationId: "tasks CORS"
      responses:
        200:
          description: "Allow"
        401:
          description: "Not allowed"