We added -p and --no-tls-proto option to h2load in order to support SPDY in clear text.

Previously h2load supports SPDY only for https URI. This is because SPDY has no mechanism to negotiate its protocol version without ALPN/NPN. With -p option, user can specify the ALPN identifier to use when http URI (in clear text) is used.

Almost all SPDY enabled public web servers are now deployed with SSL/TLS. But inside the server farm, between SSL/TLS terminator and backend server may communicate SPDY in clear text. This option is very handy to perform load tests for those SPDY servers.