def call(verb, url, command_hash)
url = server_url.merge(url) unless url.kind_of?(URI)
headers = DEFAULT_HEADERS.dup
headers['Cache-Control'] = "no-cache" if verb == :get
if command_hash
payload = WebDriver.json_dump(command_hash)
headers["Content-Type"] = "#{CONTENT_TYPE}; charset=utf-8"
headers["Content-Length"] = payload.bytesize.to_s if [:post, :put].include?(verb)
if $DEBUG
puts " >>> #{payload}"
puts " > #{headers.inspect}"
end
elsif verb == :post
payload = "{}"
headers["Content-Length"] = "2"
end
request verb, url, headers, payload
end