streaming HTTP

[rflandre]

**Current behavior:If you want to get information from an HTTP server providing constantly information, current http client open and close a connection. which prevent us from constantly querying the server and actually doing streaming

**Expected behavior: get a permanent connection on the http client so that it gets each new update

**What is the motivation / use case for changing the behavior? Some API on application works that way and not everyone is using websocket or similar technologies (which would probably be a better fit)

Additional information you deem important (e.g. I need this tomorrow):

[mellistibco]

Thanks @rflandre. also tracking a similar issue in #270 & #135