def mkcol(path, body = nil, initheader = nil)
      request(Mkcol.new(path, initheader), body)
    end
def mkcol(path, body = nil, initheader = nil)
      request(Mkcol.new(path, initheader), body)
    end
Sends a MKCOL request to the +path+ and gets a response,
 as an HTTPResponse object.