Add toEntityFlux methods

Closes gh-26023

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClient.java

@@ -622,6 +622,22 @@ class DefaultWebClient implements WebClient {
 							handleBodyFlux(response, response.bodyToFlux(elementTypeRef))));
 		}
 
+		@Override
+		public <T> Mono<ResponseEntity<Flux<T>>> toEntityFlux(Class<T> elementType) {
+			return this.responseMono.map(response ->
+					ResponseEntity.status(response.rawStatusCode())
+							.headers(response.headers().asHttpHeaders())
+							.body(response.bodyToFlux(elementType)));
+		}
+
+		@Override
+		public <T> Mono<ResponseEntity<Flux<T>>> toEntityFlux(ParameterizedTypeReference<T> elementTypeReference) {
+			return this.responseMono.map(response ->
+					ResponseEntity.status(response.rawStatusCode())
+							.headers(response.headers().asHttpHeaders())
+							.body(response.bodyToFlux(elementTypeReference)));
+		}
+
 		@Override
 		public Mono<ResponseEntity<Void>> toBodilessEntity() {
 			return this.responseMono.flatMap(response ->

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClient.java

@@ -846,6 +846,30 @@ public interface WebClient {
 		 */
 		<T> Mono<ResponseEntity<T>> toEntity(ParameterizedTypeReference<T> bodyTypeReference);
 
+		/**
+		 * Return a {@code ResponseEntity} with the body decoded to a {@code Flux}
+		 * of elements of the given type. For an error response (status code of
+		 * 4xx or 5xx), the {@code Mono} emits a {@link WebClientException}.
+		 * Use {@link #onStatus(Predicate, Function)} to customize error response
+		 * handling.
+		 * <p><strong>Note:</strong> The {@code Flux} representing the body must
+		 * be subscribed to or else associated resources will not be released.
+		 * @param elementType the type of element to decode the target Flux to
+		 * @param <T> the body element type
+		 * @return the resulting {@code ResponseEntity}
+		 * @since 5.3.1
+		 */
+		<T> Mono<ResponseEntity<Flux<T>>> toEntityFlux(Class<T> elementType);
+
+		/**
+		 * Variant of {@link #toEntity(Class)} with a {@link ParameterizedTypeReference}.
+		 * @param elementTypeReference the type of element to decode the target Flux to
+		 * @param <T> the body element type
+		 * @return the resulting {@code ResponseEntity}
+		 * @since 5.3.1
+		 */
+		<T> Mono<ResponseEntity<Flux<T>>> toEntityFlux(ParameterizedTypeReference<T> elementTypeReference);
+
 		/**
 		 * Return the response as a delayed list of {@code ResponseEntity}s. By default, if the
 		 * response has status code 4xx or 5xx, the {@code Mono} will contain a