Merge branch '2.4.x'

Closes gh-25787

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/DefaultErrorWebExceptionHandler.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -252,7 +252,7 @@ public class DefaultErrorWebExceptionHandler extends AbstractErrorWebExceptionHa
 		return (serverRequest) -> {
 			try {
 				List<MediaType> acceptedMediaTypes = serverRequest.headers().accept();
-				acceptedMediaTypes.remove(MediaType.ALL);
+				acceptedMediaTypes.removeIf(MediaType.ALL::equalsTypeAndSubtype);
 				MediaType.sortBySpecificityAndQuality(acceptedMediaTypes);
 				return acceptedMediaTypes.stream().anyMatch(MediaType.TEXT_HTML::isCompatibleWith);
 			}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/reactive/error/DefaultErrorWebExceptionHandlerTests.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package org.springframework.boot.autoconfigure.web.reactive.error;
 
 import java.util.Collections;
+import java.util.List;
 import java.util.Map;
 
 import org.junit.jupiter.api.Test;
@@ -28,9 +29,12 @@ import org.springframework.boot.web.reactive.context.AnnotationConfigReactiveWeb
 import org.springframework.boot.web.reactive.error.ErrorAttributes;
 import org.springframework.context.ApplicationContext;
 import org.springframework.http.MediaType;
+import org.springframework.http.codec.HttpMessageReader;
+import org.springframework.http.codec.ServerCodecConfigurer;
 import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
 import org.springframework.mock.web.server.MockServerWebExchange;
 import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.web.reactive.function.server.ServerRequest;
 import org.springframework.web.reactive.result.view.View;
 import org.springframework.web.reactive.result.view.ViewResolver;
 import org.springframework.web.server.ServerWebExchange;
@@ -42,7 +46,7 @@ import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
 
 /**
- * Tests for {@link AbstractErrorWebExceptionHandler}.
+ * Tests for {@link DefaultErrorWebExceptionHandler}.
  *
  * @author Phillip Webb
  * @author Madhura Bhave
@@ -62,10 +66,10 @@ class DefaultErrorWebExceptionHandlerTests {
 	@Test
 	void nonStandardErrorStatusCodeShouldNotFail() {
 		ErrorAttributes errorAttributes = mock(ErrorAttributes.class);
+		given(errorAttributes.getErrorAttributes(any(), any())).willReturn(getErrorAttributes());
 		Resources resourceProperties = new Resources();
 		ErrorProperties errorProperties = new ErrorProperties();
 		ApplicationContext context = new AnnotationConfigReactiveWebApplicationContext();
-		given(errorAttributes.getErrorAttributes(any(), any())).willReturn(getErrorAttributes());
 		DefaultErrorWebExceptionHandler exceptionHandler = new DefaultErrorWebExceptionHandler(errorAttributes,
 				resourceProperties, errorProperties, context);
 		setupViewResolver(exceptionHandler);
@@ -86,4 +90,20 @@ class DefaultErrorWebExceptionHandlerTests {
 		exceptionHandler.setViewResolvers(Collections.singletonList(viewResolver));
 	}
 
+	@Test
+	void acceptsTextHtmlShouldNotConsiderMediaAllEvenWithQuality() {
+		ErrorAttributes errorAttributes = mock(ErrorAttributes.class);
+		Resources resourceProperties = new Resources();
+		ErrorProperties errorProperties = new ErrorProperties();
+		ApplicationContext context = new AnnotationConfigReactiveWebApplicationContext();
+		DefaultErrorWebExceptionHandler exceptionHandler = new DefaultErrorWebExceptionHandler(errorAttributes,
+				resourceProperties, errorProperties, context);
+		MediaType allWithQuality = new MediaType(MediaType.ALL.getType(), MediaType.ALL.getSubtype(), 0.9);
+		MockServerWebExchange exchange = MockServerWebExchange
+				.from(MockServerHttpRequest.get("/test").accept(allWithQuality));
+		List<HttpMessageReader<?>> readers = ServerCodecConfigurer.create().getReaders();
+		ServerRequest request = ServerRequest.create(exchange, readers);
+		assertThat(exceptionHandler.acceptsTextHtml().test(request)).isFalse();
+	}
+
 }