Change effective on 07 April 2015
For builds created using the Heroku Platform API, the API now has beta support for build output streaming. Passing
3.streaming-build-output as the version value in the
Accept header (instead of just
3) will result in an extra
output_stream_url attribute being returned. Use the URL to get streaming build output for the build.
This beta feature replaces experimental streaming build output support which will be retired.
Additional details are available on Dev Center.