class Curl::Easy
def version=(http_version)
easy.version = Curl::HTTP_NONE
easy.version = Curl::HTTP_1_0
easy.version = Curl::HTTP_1_1
easy.version = Curl::HTTP_2_0
easy = Curl::Easy.new("url")
call-seq:
def version=(http_version) set :http_version, http_version end