diff --git a/spring-test/src/main/java/org/springframework/mock/http/server/reactive/MockServerHttpResponse.java b/spring-test/src/main/java/org/springframework/mock/http/server/reactive/MockServerHttpResponse.java
index b2f2d863e6..ee040c8085 100644
--- a/spring-test/src/main/java/org/springframework/mock/http/server/reactive/MockServerHttpResponse.java
+++ b/spring-test/src/main/java/org/springframework/mock/http/server/reactive/MockServerHttpResponse.java
@@ -18,6 +18,7 @@ package org.springframework.mock.http.server.reactive;
 
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.util.function.Function;
 import java.util.function.Supplier;
 
 import org.reactivestreams.Publisher;
@@ -56,6 +57,8 @@ public class MockServerHttpResponse implements ServerHttpResponse {
 
 	private DataBufferFactory bufferFactory = new DefaultDataBufferFactory();
 
+	private Function<String, String> urlEncoder = url -> url;
+
 
 	@Override
 	public boolean setStatusCode(HttpStatus status) {
@@ -111,6 +114,16 @@ public class MockServerHttpResponse implements ServerHttpResponse {
 		return this.bufferFactory;
 	}
 
+	@Override
+	public String encodeUrl(String url) {
+		return (this.urlEncoder != null ? this.urlEncoder.apply(url) : url);
+	}
+
+	@Override
+	public void registerUrlEncoder(Function<String, String> encoder) {
+		this.urlEncoder = (this.urlEncoder != null ? this.urlEncoder.andThen(encoder) : encoder);
+	}
+
 	/**
 	 * Return the body of the response aggregated and converted to a String
 	 * using the charset of the Content-Type response or otherwise defaulting