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Filters, Codecs, Errors & Streaming

3 roadmaps31 questions

The surrounding reactive machinery: WebFilters, exception handling, codecs, SSE and streaming responses, configuration hooks, and WebSockets. Interviewers dip in when they want to know how far past hello-world your WebFlux experience goes.

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When would you extend WebFluxConfigurationSupport (or use DelegatingWebFluxConfiguration) instead of implementing WebFluxConfigurer, and what are the trade-offs?

level: principalimportance: nice to knowfreq 22%

basics

~20 s

Implement WebFluxConfigurer for additive tweaks that keep defaults. Extend WebFluxConfigurationSupport only when you must replace or fully control the infrastructure beans by overriding its @Bean methods — at the cost of disabling Boot auto-config and owning every default yourself.

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