diff --git a/packages/trace-viewer/src/ui/modelUtil.ts b/packages/trace-viewer/src/ui/modelUtil.ts
index 5949f4406c..c82cbc99a6 100644
--- a/packages/trace-viewer/src/ui/modelUtil.ts
+++ b/packages/trace-viewer/src/ui/modelUtil.ts
@@ -411,9 +411,28 @@ function collectSources(actions: trace.ActionTraceEvent[], errorDescriptors: Err
 }
 
 const kRouteMethods = new Set([
-  'page.route', 'page.routefromhar', 'page.unroute', 'page.unrouteall',
-  'browsercontext.route', 'browsercontext.routefromhar', 'browsercontext.unroute', 'browsercontext.unrouteall',
+  'page.route',
+  'page.routefromhar',
+  'page.unroute',
+  'page.unrouteall',
+  'browsercontext.route',
+  'browsercontext.routefromhar',
+  'browsercontext.unroute',
+  'browsercontext.unrouteall',
 ]);
+{
+  // .NET adds async suffix.
+  for (const method of [...kRouteMethods])
+    kRouteMethods.add(method + 'async');
+  // Python methods which contain underscores.
+  for (const method of [
+    'page.route_from_har',
+    'page.unroute_all',
+    'context.route_from_har',
+    'context.unroute_all',
+  ])
+    kRouteMethods.add(method);
+}
 export function isRouteAction(action: ActionTraceEventInContext) {
   return action.class === 'Route' || kRouteMethods.has(action.apiName.toLowerCase());
 }