[#399]: Clarifies behavior on empty response body.

[monkpow]

@raphaeleidus @amir-arad How does this address your concerns on issue #399 ?

@amir-arad: I've used some of the code from your PR in this test. If you'd like credit on the commit log, can you submit a patch for just the test, and I'll accept it right away.

Thanks

[amir-arad]

It's not relevant for my project. I ended up writing my own proxy, it's easier. no need for credit on the code, nice of you to offer. go ahead with the merge.