Function Stages

A function stage indicates when a function takes effect. The priority of function configurations in CDN and FunctionGraph vary in different stages.

Client request received, Before caching origin content, and Before response to client: Functions are executed in FunctionGraph first and then configured by CDN, so CDN configuration takes effect.
Before origin pull: Functions are configured by CDN first and then executed in FunctionGraph, so FunctionGraph configuration takes effect.

**Table 1** Function stages
Stage	Description
Client request received	After a client initiates a request but before a CDN PoP receives the request. Example: URL rewrite
Before origin pull	After a CDN PoP receives a request for uncached content but before it pulls content from the origin server. Example: origin URL rewrite
Before caching origin content Before response to client	After the origin server sends a response to a CDN PoP but before the PoP caches the content. Example: cache rules Before a CDN PoP sends a response to a client. Example: browser cache TTL

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