DefaultClientResponseBuilder copies logPrefix

Closes gh-25069

spring-web/src/testFixtures/java/org/springframework/web/testfixture/http/client/reactive/MockClientHttpRequest.java

@@ -33,6 +33,7 @@ import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpRequest;
 import org.springframework.http.client.reactive.AbstractClientHttpRequest;
 import org.springframework.http.client.reactive.ClientHttpRequest;
 import org.springframework.util.Assert;
@@ -46,7 +47,7 @@ import org.springframework.web.util.UriComponentsBuilder;
  * @author Rossen Stoyanchev
  * @since 5.0
  */
-public class MockClientHttpRequest extends AbstractClientHttpRequest {
+public class MockClientHttpRequest extends AbstractClientHttpRequest implements HttpRequest {
 
 	private final HttpMethod httpMethod;
 
@@ -96,6 +97,11 @@ public class MockClientHttpRequest extends AbstractClientHttpRequest {
 		return this.httpMethod;
 	}
 
+	@Override
+	public String getMethodValue() {
+		return this.httpMethod.name();
+	}
+
 	@Override
 	public URI getURI() {
 		return this.url;

spring-web/src/testFixtures/java/org/springframework/web/testfixture/http/client/reactive/MockClientHttpResponse.java

@@ -83,7 +83,7 @@ public class MockClientHttpResponse implements ClientHttpResponse {
 	public HttpHeaders getHeaders() {
 		if (!getCookies().isEmpty() && this.headers.get(HttpHeaders.SET_COOKIE) == null) {
 			getCookies().values().stream().flatMap(Collection::stream)
-					.forEach(cookie -> getHeaders().add(HttpHeaders.SET_COOKIE, cookie.toString()));
+					.forEach(cookie -> this.headers.add(HttpHeaders.SET_COOKIE, cookie.toString()));
 		}
 		return this.headers;
 	}