Tests for reproducing issue #21.
Tests for reproducing issue #21.

Two tests added:
- test-post-no-body
- test-put-no-body

Both are sending no body.

jkk/http.async.client,diamondap/http.async.client,oliyh/http.async.client,bpoweski/http.async.client,josephwilk/http.async.client,canassa/http.async.client,michaelneale/http.async.client,klang/http.async.client