Adapt Windows path handling fix to deal with Jetty

Update `NestedLocation` to deal with the fact that Jetty attempts
to fix URLs.

See gh-40549

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/net/protocol/nested/NestedLocation.java

@@ -107,18 +107,26 @@ private static NestedLocation create(String location) {
 
 	private static Path asPath(String locationPath) {
 		return pathCache.computeIfAbsent(locationPath, (key) -> {
-			if (isWindows() && locationPath.length() > 2 && locationPath.charAt(2) == ':') {
-				// Use the same logic as Java's internal WindowsUriSupport class
-				return Path.of(locationPath.substring(1));
-			}
-			return Path.of(locationPath);
+			return Path.of((!isWindows()) ? locationPath : fixWindowsLocationPath(locationPath));
 		});
 	}
 
 	private static boolean isWindows() {
 		return File.separatorChar == '\\';
 	}
 
+	private static String fixWindowsLocationPath(String locationPath) {
+		// Same logic as Java's internal WindowsUriSupport class
+		if (locationPath.length() > 2 && locationPath.charAt(2) == ':') {
+			return locationPath.substring(1);
+		}
+		// Deal with Jetty's org.eclipse.jetty.util.URIUtil#correctURI(URI)
+		if (locationPath.startsWith("///") && locationPath.charAt(4) == ':') {
+			return locationPath.substring(3);
+		}
+		return locationPath;
+	}
+
 	static void clearCache() {
 		locationCache.clear();
 		pathCache.clear();