[connection] after send header send directly the content
[connection] after send header send directly the content

The content may content data after the first connector call, and a
second connector call may exceed the maximum size of the content. It
better to send the content before the second connector call.

ouistiti-project/libhttpserver,mchalain/libhttpserver,mchalain/libhttpserver,ouistiti-project/libhttpserver