+--------+
                     send PP ⎢        ⎢ recv PP
                    ,--------⎢  idle  ⎢--------.
                   /         ⎢        ⎢         \
                  v          +--------+          v
           +----------+          ⎢           +----------+
           ⎢          ⎢          ⎢ send H /  ⎢          ⎢
    ,------⎢ reserved ⎢          ⎢ recv H    ⎢ reserved ⎢------.
    ⎢      ⎢ (local)  ⎢          ⎢           ⎢ (remote) ⎢      ⎢
    ⎢      +----------+          v           +----------+      ⎢
    ⎢          ⎢             +--------+             ⎢          ⎢
    ⎢          ⎢     recv ES ⎢        ⎢ send ES     ⎢          ⎢
    ⎢   send H ⎢     ,-------⎢  open  ⎢-------.     ⎢ recv H   ⎢
    ⎢          ⎢    /        ⎢        ⎢        \    ⎢          ⎢
    ⎢          v   v         +--------+         v   v          ⎢
    ⎢      +----------+          ⎢           +----------+      ⎢
    ⎢      ⎢   half   ⎢          ⎢           ⎢   half   ⎢      ⎢
    ⎢      ⎢  closed  ⎢          ⎢ send R /  ⎢  closed  ⎢      ⎢
    ⎢      ⎢ (remote) ⎢          ⎢ recv R    ⎢ (local)  ⎢      ⎢
    ⎢      +----------+          ⎢           +----------+      ⎢
    ⎢           ⎢                ⎢                 ⎢           ⎢
    ⎢           ⎢ send ES /      ⎢       recv ES / ⎢           ⎢
    ⎢           ⎢ send R /       v        send R / ⎢           ⎢
    ⎢           ⎢ recv R     +--------+   recv R   ⎢           ⎢
    ⎢ send R /  `----------->⎢        ⎢<-----------'  send R / ⎢
    ⎢ recv R                 ⎢ closed ⎢               recv R   ⎢
    `----------------------->⎢        ⎢<----------------------'
                             +--------+
                             
send:   endpoint sends this frame
recv:   endpoint receives this frame

H : HEADERS frame (with implied CONTINUATIONs)
PP: PUSH_PROMISE frame (with implied CONTINUATIONs)
ES: END_STREAM flag
R : RST_STREAM frame