Add missing webAPI route (#10650)

Co-authored-by: Jeremy R. Easton-Marks <[email protected]>

src/main/java/org/cbioportal/WebAppConfig.java

@@ -58,7 +58,8 @@ public void addViewControllers(ViewControllerRegistry registry) {
 			"/oncoprinter**",
 			"/encodedRedirect",
 			"/datasets**",
-			"/ln**"
+			"/ln**",
+            "/webAPI**"
 		);
 
 		endpoints.forEach( route -> registry.addViewController(route).setViewName(SINGLE_PAGE_APP_ROOT));