Avoid unnecessary parsing of path params

Closes gh-25690

spring-web/src/main/java/org/springframework/web/util/UrlPathHelper.java

@@ -521,8 +521,7 @@ public class UrlPathHelper {
 	 * @return the updated URI string
 	 */
 	public String removeSemicolonContent(String requestUri) {
-		return (this.removeSemicolonContent ?
-				removeSemicolonContentInternal(requestUri) : removeJsessionid(requestUri));
+		return (this.removeSemicolonContent ? removeSemicolonContentInternal(requestUri) : requestUri);
 	}
 
 	private String removeSemicolonContentInternal(String requestUri) {
@@ -536,16 +535,6 @@ public class UrlPathHelper {
 		return requestUri;
 	}
 
-	private String removeJsessionid(String requestUri) {
-		int startIndex = requestUri.toLowerCase().indexOf(";jsessionid=");
-		if (startIndex != -1) {
-			int endIndex = requestUri.indexOf(';', startIndex + 12);
-			String start = requestUri.substring(0, startIndex);
-			requestUri = (endIndex != -1) ? start + requestUri.substring(endIndex) : start;
-		}
-		return requestUri;
-	}
-
 	/**
 	 * Decode the given URI path variables via {@link #decodeRequestString} unless
 	 * {@link #setUrlDecode} is set to {@code true} in which case it is assumed

spring-web/src/main/java/org/springframework/web/util/WebUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -661,6 +661,9 @@ public abstract class WebUtils {
 			int index = pair.indexOf('=');
 			if (index != -1) {
 				String name = pair.substring(0, index);
+				if (name.equalsIgnoreCase("jsessionid")) {
+					continue;
+				}
 				String rawValue = pair.substring(index + 1);
 				for (String value : StringUtils.commaDelimitedListToStringArray(rawValue)) {
 					result.add(name, value);

spring-web/src/test/java/org/springframework/web/util/UrlPathHelperTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -126,22 +126,14 @@ public class UrlPathHelperTests {
 	}
 
 	@Test
-	public void getRequestKeepSemicolonContent() throws UnsupportedEncodingException {
+	public void getRequestKeepSemicolonContent() {
 		helper.setRemoveSemicolonContent(false);
 
 		request.setRequestURI("/foo;a=b;c=d");
 		assertEquals("/foo;a=b;c=d", helper.getRequestUri(request));
 
 		request.setRequestURI("/foo;jsessionid=c0o7fszeb1");
-		assertEquals("jsessionid should always be removed", "/foo", helper.getRequestUri(request));
-
-		request.setRequestURI("/foo;a=b;jsessionid=c0o7fszeb1;c=d");
-		assertEquals("jsessionid should always be removed", "/foo;a=b;c=d", helper.getRequestUri(request));
-
-		// SPR-10398
-
-		request.setRequestURI("/foo;a=b;JSESSIONID=c0o7fszeb1;c=d");
-		assertEquals("JSESSIONID should always be removed", "/foo;a=b;c=d", helper.getRequestUri(request));
+		assertEquals("/foo;jsessionid=c0o7fszeb1", helper.getRequestUri(request));
 	}
 
 	@Test

spring-web/src/test/java/org/springframework/web/util/WebUtilsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -86,6 +86,19 @@ public class WebUtilsTests {
 		variables = WebUtils.parseMatrixVariables("colors=red;colors=blue;colors=green");
 		assertEquals(1, variables.size());
 		assertEquals(Arrays.asList("red", "blue", "green"), variables.get("colors"));
+
+		variables = WebUtils.parseMatrixVariables("jsessionid=c0o7fszeb1");
+		assertTrue(variables.isEmpty());
+
+		variables = WebUtils.parseMatrixVariables("a=b;jsessionid=c0o7fszeb1;c=d");
+		assertEquals(2, variables.size());
+		assertEquals(Collections.singletonList("b"), variables.get("a"));
+		assertEquals(Collections.singletonList("d"), variables.get("c"));
+
+		variables = WebUtils.parseMatrixVariables("a=b;jsessionid=c0o7fszeb1;c=d");
+		assertEquals(2, variables.size());
+		assertEquals(Collections.singletonList("b"), variables.get("a"));
+		assertEquals(Collections.singletonList("d"), variables.get("c"));
 	}
 
 	@Test