Update Conduit for handleRequest

Summary: Ref T8628. Updates Conduit for handleRequest

Test Plan: Use Conduit, test list, method calls, try a query, post this diff.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T8628

Differential Revision: https://secure.phabricator.com/D14265