Follow the how-to

backend.py

@@ -16,7 +16,7 @@ class BackendHandler(BaseHTTPServer.BaseHTTPRequestHandler):
     self.send_header('X-Content-Type-Options', 'nosniff')
     self.send_header('Access-Control-Allow-Origin', self.server.CORS_ORIGIN)
     self.end_headers()
-    if self.path.startswith('/test'):
+    if self.path.startswith('/MYTESTFILE.txt'):
       self.wfile.write(self.response)
     else:
      self.wfile.write('Hello!')