Fix issue with parsing x-forwarded-host header

Issue: SPR-10701

spring-webmvc/src/main/java/org/springframework/web/servlet/support/ServletUriComponentsBuilder.java

@@ -94,9 +94,20 @@ public class ServletUriComponentsBuilder extends UriComponentsBuilder {
 	public static ServletUriComponentsBuilder fromRequest(HttpServletRequest request) {
 		String scheme = request.getScheme();
 		int port = request.getServerPort();
+		String host = request.getServerName();
 
-		String header = request.getHeader("X-Forwarded-Host");
+		String xForwardedHostHeader = request.getHeader("X-Forwarded-Host");
-		String host = StringUtils.hasText(header) ? header: request.getServerName();
+
+		if (StringUtils.hasText(xForwardedHostHeader)) {
+			if (StringUtils.countOccurrencesOf(xForwardedHostHeader, ":") == 1) {
+				String[] hostAndPort = StringUtils.split(xForwardedHostHeader, ":");
+				host  = hostAndPort[0];
+				port = Integer.parseInt(hostAndPort[1]);
+			}
+			else {
+				host = xForwardedHostHeader;
+			}
+		}
 
 		ServletUriComponentsBuilder builder = new ServletUriComponentsBuilder();
 		builder.scheme(scheme);

spring-webmvc/src/test/java/org/springframework/web/servlet/support/ServletUriComponentsBuilderTests.java

@@ -16,13 +16,14 @@
 
 package org.springframework.web.servlet.support;
 
-import static org.junit.Assert.assertEquals;
-
 import org.junit.Before;
 import org.junit.Test;
 import org.springframework.mock.web.test.MockHttpServletRequest;
 import org.springframework.web.context.request.RequestContextHolder;
 import org.springframework.web.context.request.ServletRequestAttributes;
+import org.springframework.web.util.UriComponents;
+
+import static org.junit.Assert.*;
 
 /**
  * @author Rossen Stoyanchev
@@ -93,6 +94,19 @@ public class ServletUriComponentsBuilderTests {
 		assertEquals("http://anotherHost/mvc-showcase/data/param?foo=123", result);
 	}
 
+	// SPR-10701
+
+	@Test
+	public void fromRequestWithForwardedHostAndPortHeader() {
+		request.addHeader("X-Forwarded-Host", "webtest.foo.bar.com:443");
+		request.setRequestURI("/mvc-showcase/data/param");
+		request.setQueryString("foo=123");
+		UriComponents result = ServletUriComponentsBuilder.fromRequest(request).build();
+
+		assertEquals("webtest.foo.bar.com", result.getHost());
+		assertEquals(443, result.getPort());
+	}
+
 	@Test
 	public void fromContextPath() {
 		request.setRequestURI("/mvc-showcase/data/param");