Note that this way, it is easy to redefine `launch' in order to customize the launching instruction if needed (thinking about testing...)
This might breaks some code since it adds a `launch' feature, but it is easy to fix and unlikely to happen often.
before it was storing some header in the body.
now we added redirections: .. which is a list of redirection informations:
- status line
- header
- and eventual redirection body (but at least by default, libcurl does not cache body)
Enhanced the http_client library to be able to write directly the downloaded data into a file (or as convenient thanks to agent).