docs: http-lp forwarding goes over the agent's WebSocket, by long polls only without one - said so in the panel, the code and the README

internal/server/forward.go

@@ -12,8 +12,9 @@ import (
 
 // forwardManager owns the host-side listeners for port-forward rules. It
 // supports three transports:
-//   - "http": tunneled over the HTTP long-poll channel (works anywhere nginx
-//     reaches, highest latency);
+//   - "http": over the agent's own link to the panel - its WebSocket, or the
+//     HTTP long polls while there is none (works anywhere nginx reaches,
+//     highest latency);
 //   - "tcp":  direct TCP multiplexed over the tunnel port (low latency);
 //   - "udp":  direct UDP over the tunnel port.
 type forwardManager struct {
@@ -103,7 +104,8 @@ func (m *forwardManager) bridgeDirect(rule ForwardRule, conn net.Conn) {
 	at.openStream(rule.ClientPort, conn)
 }
 
-// bridgeHTTP wires a connection through the HTTP long-poll hub session.
+// bridgeHTTP wires a connection through a hub session: the agent carries it
+// over its WebSocket, or by long polls while it has none.
 func (m *forwardManager) bridgeHTTP(rule ForwardRule, conn net.Conn) {
 	sess := m.hub.CreateForward(rule.AgentID, rule.ClientPort)
 	defer m.hub.CloseSession(sess.ID)