joyent/node — pull request #8925 by jasnell (2014-12-22 18:53:57+00:00)
Title: Add support for 'prefer' and 'preference-applied' (RFC 7240)

RFC 7240 defines the Prefer and Preference-Applied header fields. Each can appear multiple times within an HTTP request/response (similar to Link). This adds basic support for Prefer/Preference-Applied and adds Link and Prefer to the relevant test case.