Alex Kotliarskyi b8804fdbc3 Send progress events via multipart response
Summary:
Context: I'm trying to add support for sending packager progress events to the client that is downloading the bundle over HTTP multipart response.

The idea is for the client to send `Accept: multipart/mixed` header, and if present the server will stream progress events to the client. This will ensure the change is backwards-compatible - the clients who don't know about progress events won't receive them.

In the future we can use this approach to download RAM bundle modules in one request.

Reviewed By: davidaurelio

Differential Revision: D3926984

fbshipit-source-id: 39a6e38e40a79f7a2f2cf40765a0655fb13b7918
2016-10-03 18:13:36 -07:00
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2016-07-29 11:15:02 -07:00