This flag is used to signal that an Extended CONNECT has been sent by
the server mux on the current stream.
This will allow to convert the response to a 101 htx status message.
#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
-#define H2_SF_TUNNEL_ABRT 0x00100000 // A tunnel attempt was aborted
+#define H2_SF_EXT_CONNECT_SENT 0x00040000 // rfc 8441 an Extended CONNECT has been sent
+#define H2_SF_TUNNEL_ABRT 0x00100000 // A tunnel attempt was aborted
/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
* it is being processed in the internal HTTP representation (HTX).