These'r a list of variables passed from argv to the program in this way:
argv={"name","value","name","value"....}

Referer: old-url             # Latest url visited
User-Agent: w3m nav.         # Client WebBrowser
Host: vhost                  # Usage for virtual hosts
Accept: (comma separated
Accept-Encoding: gzip        # compressio de resposta
Accept-Language: es en       # llanguatges preferits
Cookie:
Content-Type:
Content-Length:
Authorization:
Connection:       keep-alive || close
Server: SWS/0.03             # Server info
Upgrade: HTTP/2.0, SHTTP/1.3 # Other protocols supported
