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API Gateway & Reverse Proxy (Nginx + Spring Cloud Gateway) · Lesson

Pre/Post Processing with Filters

Apply filters for actions before (pre) a request reaches the service and after (post) the service responds.

Intro to Pre/Post Filters

Welcome! In this lesson, we'll explore how Spring Cloud Gateway filters can process requests before they reach a backend service (pre-processing) and after the service responds (post-processing).

This fine-grained control is crucial for handling complex API gateway tasks.

The Filter Chain Revisited

Recall that filters operate in a chain. Each GatewayFilter or GlobalFilter can perform actions:

  • Before calling chain.filter(exchange): This is pre-processing.
  • After chain.filter(exchange) returns a Mono<Void>: This is post-processing.

The reactive nature of Spring Cloud Gateway, using Mono, makes this sequential execution powerful.

All lessons in this course

  1. Global Filters & GatewayFilterFactory
  2. Custom Request/Response Filters
  3. Pre/Post Processing with Filters
  4. Built-in GatewayFilters You Should Know
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