Encode IPV6 Zone IDs in ReactorServerHttpRequest

This commit ensures that the zone id in the ReactorServerHttpRequest is
properly encoded.

Closes gh-30188

spring-web/src/test/java/org/springframework/http/server/reactive/ReactorUriHelperTests.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2002-2023 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.server.reactive;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import org.junit.jupiter.api.Test;
+import reactor.netty.http.server.HttpServerRequest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class ReactorUriHelperTests {
+
+	@Test
+	public void hostnameWithZoneId() throws URISyntaxException {
+		HttpServerRequest nettyRequest = mock();
+
+		given(nettyRequest.scheme()).willReturn("http");
+		given(nettyRequest.hostName()).willReturn("fe80::a%en1");
+		given(nettyRequest.hostPort()).willReturn(80);
+		given(nettyRequest.uri()).willReturn("/");
+
+		URI uri = ReactorUriHelper.createUri(nettyRequest);
+		assertThat(uri).hasScheme("http")
+				.hasHost("[fe80::a%25en1]")
+				.hasPort(-1)
+				.hasPath("/")
+				.hasToString("http://[fe80::a%25en1]/");
+
+	}
+
+}