Fix ForwardedHeaderFilter preserves semicolon content

Previously a requestURI that contained ';' would have the value incorrectly stripped out when using
ForwardedHeaderFilter.

This commit ensures that the ';' is preserved when using ForwardedHeaderFilter.

Issue: SPR-15428

Author: rwinch

spring-web/src/main/java/org/springframework/web/filter/ForwardedHeaderFilter.java

@@ -74,6 +74,7 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
 	public ForwardedHeaderFilter() {
 		this.pathHelper = new UrlPathHelper();
 		this.pathHelper.setUrlDecode(false);
+		this.pathHelper.setRemoveSemicolonContent(false);
 	}
 
 

spring-web/src/test/java/org/springframework/web/filter/ForwardedHeaderFilterTests.java

@@ -169,6 +169,17 @@ public void requestUriRootUrl() throws Exception {
 		assertEquals("/", actual.getRequestURI());
 	}
 
+	@Test
+	public void requestUriPreserveSemicolonContent() throws Exception {
+		this.request.setContextPath("");
+		this.request.setRequestURI("/path;a=b/with/semicolon");
+		HttpServletRequest actual = filterAndGetWrappedRequest();
+
+		assertEquals("", actual.getContextPath());
+		assertEquals("/path;a=b/with/semicolon", actual.getRequestURI());
+		assertEquals("http://localhost/path;a=b/with/semicolon", actual.getRequestURL().toString());
+	}
+
 	@Test
 	public void caseInsensitiveForwardedPrefix() throws Exception {
 		this.request = new MockHttpServletRequest() {