Only force request encoding

A recent Spring Framework change in `CharacterEncodingFilter` allows to
configure the force flag separately for requests and responses. This
commit enables the flag only for requests which should provide a better
default with binary content.

Closes gh-5459

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/HttpEncodingAutoConfiguration.java

@@ -50,7 +50,7 @@ public class HttpEncodingAutoConfiguration {
 	public CharacterEncodingFilter characterEncodingFilter() {
 		CharacterEncodingFilter filter = new OrderedCharacterEncodingFilter();
 		filter.setEncoding(this.httpEncodingProperties.getCharset().name());
-		filter.setForceEncoding(this.httpEncodingProperties.isForce());
+		filter.setForceRequestEncoding(this.httpEncodingProperties.isForce());
 		return filter;
 	}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/HttpEncodingAutoConfigurationTests.java

@@ -103,11 +103,10 @@ public class HttpEncodingAutoConfigurationTests {
 	}
 
 	private void assertCharacterEncodingFilter(CharacterEncodingFilter actual,
-			String encoding, boolean forceEncoding) {
+			String encoding, boolean forceRequestEncoding) {
-		DirectFieldAccessor accessor = new DirectFieldAccessor(actual);
+		assertThat(actual.getEncoding()).isEqualTo(encoding);
-		assertThat(accessor.getPropertyValue("encoding")).as("Wrong encoding")
+		assertThat(actual.isForceRequestEncoding()).isEqualTo(forceRequestEncoding);
-				.isEqualTo(encoding);
+		assertThat(actual.isForceResponseEncoding()).isFalse();
-		assertThat(accessor.getPropertyValue("forceEncoding")).isEqualTo(forceEncoding);
 	}
 
 	private void load(Class<?> config, String... environment) {