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* Add validation support into WebFlux Inbound See https://stackoverflow.com/questions/56729517/spring-integration-webflux-validate-input-json-body * Introduce a `WebFluxInboundEndpoint.validator` option to validate a request payload after conversion HTTP request into a `Publisher` * Expose a `WebFluxInboundEndpointSpec.validator()` option * Introduce a `IntegrationWebExchangeBindException` to extend a `WebExchangeBindException` for Spring Integration use-case. such an exception is used in the `ResponseStatusExceptionHandler` extensions, like one in Spring Boot for proper response rendering * Test and document the solution * * Remove unused imports from IntegrationWebExchangeBindException