Prevent double encoding in stripPrefix method

The stripPrefix method was causing URLs to be encoded twice under certain conditions.
This fix ensures proper handling of parameters to avoid redundant encoding.

Signed-off-by: raccoonback <kosb15@naver.com>

spring-cloud-gateway-server-mvc/src/main/java/org/springframework/cloud/gateway/server/mvc/filter/BeforeFilterFunctions.java

@@ -409,7 +409,7 @@ public abstract class BeforeFilterFunctions {
 
 			URI prefixedUri = UriComponentsBuilder.fromUri(request.uri())
 				.replacePath(newPath.toString())
-				.build()
+				.build(true)
 				.toUri();
 			return ServerRequest.from(request).uri(prefixedUri).build();
 		};

spring-cloud-gateway-server-mvc/src/test/java/org/springframework/cloud/gateway/server/mvc/filter/BeforeFilterFunctionsTests.java

@@ -157,4 +157,42 @@ class BeforeFilterFunctionsTests {
 		assertThat(result.uri().toString()).isEqualTo("http://localhost/new/path?foo%5B%5D=bar%5B%5D");
 	}
 
+	@Test
+	void stripPrefix() {
+		MockHttpServletRequest servletRequest = MockMvcRequestBuilders.get("http://localhost/depth1/depth2/depth3")
+				.buildRequest(null);
+
+		ServerRequest request = ServerRequest.create(servletRequest, Collections.emptyList());
+
+		ServerRequest result = BeforeFilterFunctions.stripPrefix(2).apply(request);
+
+		assertThat(result.uri().toString()).isEqualTo("http://localhost/depth3");
+	}
+
+	@Test
+	void stripPrefixWithEncodedPath() {
+		MockHttpServletRequest servletRequest = MockMvcRequestBuilders.get("http://localhost/depth1/depth2/depth3/é")
+				.buildRequest(null);
+
+		ServerRequest request = ServerRequest.create(servletRequest, Collections.emptyList());
+
+		ServerRequest result = BeforeFilterFunctions.stripPrefix(2).apply(request);
+
+		assertThat(result.uri().toString()).isEqualTo("http://localhost/depth3/%C3%A9");
+	}
+
+	@Test
+	void stripPrefixWithEncodedParameters() {
+		MockHttpServletRequest servletRequest = MockMvcRequestBuilders.get("http://localhost/depth1/depth2/depth3")
+				.queryParam("baz[]", "qux[]")
+				.buildRequest(null);
+
+		ServerRequest request = ServerRequest.create(servletRequest, Collections.emptyList());
+
+		ServerRequest result = BeforeFilterFunctions.stripPrefix(2).apply(request);
+
+		assertThat(result.param("baz[]")).isPresent().hasValue("qux[]");
+		assertThat(result.uri().toString()).isEqualTo("http://localhost/depth3?baz%5B%5D=qux%5B%5D");
+	}
+
 }