Send the egress message headers to the Transport. This method does
not actually write the message out on the wire immediately. All
writes happen at the end of the event loop at the earliest.
Note: This method should be called once per message unless the first
headers sent indicate a 1xx status.
sendHeaders will not set EOM flag in header frame, whereas
sendHeadersWithEOM will. sendHeadersWithOptionalEOM backs both of them.
Send the egress message headers to the Transport. This method does not actually write the message out on the wire immediately. All writes happen at the end of the event loop at the earliest. Note: This method should be called once per message unless the first headers sent indicate a 1xx status.
sendHeaders will not set EOM flag in header frame, whereas sendHeadersWithEOM will. sendHeadersWithOptionalEOM backs both of them.
@param headers Message headers