This is because compiler may warn that name `index` shadows global
declaration if the application code uses the prototype argument names
as is.

Updated program output to the latest version. Mentioned spdycli.

SPDYLAY_ERR_TEMPORAL_CALLBACK_FAILURE to signal stream error.

when WINDOW_UPDATE is received.

INITIAL_WINDOW_SIZE is received and the window size becomes positive.

This callback function is invoked when the unknown frame type is received.
Added debug output using this callback to spdycat.

This callback function is invoked when the received frame data could not
be parsed correctly.
Added debug output using this callback to spdycat.

is set.

This option sets the initial window size bits.

using SETTINGS_MAX_CONCURRENT_STREAMS