Send Accept-Ranges: bytes with every response

[boramalper]

Please ensure that your pull request fulfills these requirements:

• The pull request is being made against the master branch
• Tests for the changes have been added (for bug fixes / features)

What is the purpose of this pull request? (bug fix, enhancement, new feature,...)

Enhancement

What changes did you make?

Now Accept-Ranges: bytes header is sent with every response by default.

Provide some example code that this change will affect, if applicable:

N/A

Is there anything you'd like reviewers to focus on?

I think sending Accept-Ranges: bytes with every response is pretty benign, but surely the behaviour of some programs might be affected with this header (i.e. they might try to stream instead of downloading the whole file). If this is a concern, a new command-line flag can be added.

Please provide testing instructions, if applicable:

N/A

[thornjad]

What does this header mean for the client? What does it do?

[boramalper]

@thornjad See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Ranges

[thornjad]

Since this is to be sent with every request, it might be better to put it into the main lib/http-server.js rather than the CLI driver in bin/. Otherwise, pretty nice! It should be pretty benign for most uses, but I'm going to mark it as a major change just in case.

[thornjad]

Would this fix #257?

[boramalper]

Sorry I no longer have the repository on my computer (removed it during a migration). It's a trivial change, so please feel free to go ahead and implement it yourself (without giving "credit"). =)

[thornjad]

Okay, sure I'll take over this PR!

[thornjad]

Presuming the tests pass, I'll approve this PR; thanks for your addition! I made a couple changes to your fork directly so we'll keep history and credit steady.

[thornjad]

Changes staged for v0.13.0

[boramalper]

Thanks! <3