headzoo/surf — pull request #1 by haruyama (2014-09-16 03:30:40+00:00)
Title: Add body to arguments of buildRequest().

Some web servers require Content-Length Header for POST requests.
We should set http.Request.ContentLength field properly.

When we set Request.Body manually, we should set Request.ContentLength manually too.

http.NewRequest() sets ContentLength field automatically, so we may use it.