http: should support userland Agent

PR-URL: https://github.com/nodejs/node/pull/11567
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/_http_client.js b/lib/_http_client.js
index d281b120c8..2205e89d2a 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -89,9 +89,9 @@ function ClientRequest(options, cb) {
     }
     // Explicitly pass through this statement as agent will not be used
     // when createConnection is provided.
-  } else if (!(agent instanceof Agent.Agent)) {
+  } else if (typeof agent.addRequest !== 'function') {
     throw new TypeError(
-      'Agent option must be an instance of http.Agent, undefined or false.'
+      'Agent option must be an Agent-like object, undefined, or false.'
     );
   }
   this.agent = agent;