Simplify reading all the request data
Simplify reading all the request data

If we can not use mg_read() in this manner, we should fix mg_read().
This commit restores timeout behavior of forward_body_data().

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver