$ h2i Usage: h2i <hostname> -insecure Whether to skip TLS cert validation -nextproto string Comma-separated list of NPN/ALPN protocol names to negotiate. (default "h2,h2-14") $ h2i google.com Connecting to google.com:443 ... Connected to 74.125.224.41:443 Negotiated protocol "h2-14" [FrameHeader SETTINGS len=18] [MAX_CONCURRENT_STREAMS = 100] [INITIAL_WINDOW_SIZE = 1048576] [MAX_FRAME_SIZE = 16384