Turns out to be really important to do this exactly once.
Not doing so can cause RST_STREAM / INTERNAL errors.
/** Receive initial metadata: one and only one MUST be made on the client,
must not be made on the server.
This op completes after all initial metadata has been read from the
peer. */
Turns out to be really important to do this exactly once. Not doing so can cause RST_STREAM / INTERNAL errors.