code: def proxy_it(request, port):
      
  
      # Check if we have websocket proxy configured
      websocket_proxy = request.registry.settings.get("pyramid_notebook.websocket_proxy", "")
      if websocket_proxy.strip():
          r = DottedNameResolver()
          websocket_proxy = r.maybe_resolve(websocket_proxy)
  
      if "upgrade" in request.headers.get("connection", "").lower():
          if websocket_proxy:
              return websocket_proxy(request, port)
          else:
              # If we run on localhost on pserve, we should never hit here as requests go directly to IPython Notebook kernel, not us
              raise RuntimeError("Websocket proxy support is not configured.")
  
      proxy_app = WSGIProxyApplication(port)
  
      return request.get_response(proxy_app)
docs: Proxy HTTP request to upstream IPython Notebook Tornado server.