Fastly has partnered with Google to provide an integration between Fastly and Google services. Specifically, the integration allows you to connect Google's Cloud Platform service directly to Fastly's content delivery network services via private network interconnections (direct PNIs), thus speeding up your content delivery and optimizing backend workload.
When you sign up for Fastly services and configure a Google Cloud Platform service as your origin server, you designate a specific point of presence (POP) to serve as an Origin Shield that handles cached content from their servers.
Requests from Fastly POPs to these specific Origin Shields are routed over Fastly's network, leveraging optimized TCP connection handling, quick-start, and opened connections to ensure fast response times between POPs and through to the end-user. Fastly ensures requests go directly to the Origin Shield instead of the origin servers. Only requests that the entire network has never handled will go back to the Google Cloud Platform service.