do_rpc

# File lib/xmlrpc/client.rb, line 463
 def do_rpc(request, async=false)
 header = {
 "User-Agent" => USER_AGENT,
 "Content-Type" => "text/xml; charset=utf-8",
 "Content-Length" => request.bytesize.to_s,
 "Connection" => (async ? "close" : "keep-alive")
 }
 header["Cookie"] = @cookie if @cookie
 header.update(@http_header_extra) if @http_header_extra
 if @auth != nil
 # add authorization header
 header["Authorization"] = @auth
 end
 resp = nil
 @http_last_response = nil
 if async
 # use a new HTTP object for each call
 http = dup_net_http
 # post request
 http.start {
 resp = http.request_post(@path, request, header)
 }
 else
 # reuse the HTTP object for each call => connection alive is possible
 # we must start connection explicitly first time so that http.request
 # does not assume that we don't want keepalive
 @http.start if not @http.started?
 # post request
 resp = @http.request_post(@path, request, header)
 end
 @http_last_response = resp
 data = resp.body
 if resp.code == "401"
 # Authorization Required
 raise "Authorization failed.\nHTTP-Error: #{resp.code} #{resp.message}"
 elsif resp.code[0,1] != "2"
 raise "HTTP-Error: #{resp.code} #{resp.message}"
 end
 # assume text/xml on instances where Content-Type header is not set
 ct_expected = resp["Content-Type"] || 'text/xml'
 ct = parse_content_type(ct_expected).first
 if ct != "text/xml"
 if ct == "text/html"
 raise "Wrong content-type (received '#{ct}' but expected 'text/xml'): \n#{data}"
 else
 raise "Wrong content-type (received '#{ct}' but expected 'text/xml')"
 end
 end
 expected = resp["Content-Length"] || "<unknown>"
 if data.nil? or data.bytesize == 0
 raise "Wrong size. Was #{data.bytesize}, should be #{expected}"
 end
 parse_set_cookies(resp.get_fields("Set-Cookie"))
 return data
 end