This article discusses how to call Google Cloud APIs from Cloudflare Workers. It explains the limitations of Cloudflare Workers compared to other serverless functions platforms and provides a solution for calling Google Cloud Pub/Sub API directly from Cloudflare despite the lack of a pure JavaScript SDK. The author outlines the process of creating a homemade client, importing RSA keys, signing JWTs, and making authorized API calls using a signed JWT directly as a bearer token or via OAuth 2.0 access token.