TUN-4889: Add back appendtagheaders function

TUN-4701 accidentally removed adding tagheaders. This commit adds it
back.

connection/protocol.go

@@ -76,7 +76,6 @@ func (p Protocol) TLSSettings() *TLSSettings {
 			ServerName: edgeH2TLSServerName,
 		}
 	case QUIC:
-		fmt.Println("returning this?")
 		return &TLSSettings{
 			ServerName: edgeQUICServerName,
 			NextProtos: []string{"argotunnel"},

connection/quic.go

@@ -106,7 +106,6 @@ func (q *QUICConnection) handleStream(stream quic.Stream) error {
 		w := newHTTPResponseAdapter(stream)
 		return q.httpProxy.ProxyHTTP(w, req, connectRequest.Type == quicpogs.ConnectionTypeWebsocket)
 	case quicpogs.ConnectionTypeTCP:
-		// TODO: This is a placeholder for testing completion. TUN-4865 will add proper TCP support.
 		rwa := &streamReadWriteAcker{
 			ReadWriter: stream,
 		}

origin/proxy.go

@@ -63,6 +63,7 @@ func (p *Proxy) ProxyHTTP(
 
 	cfRay := connection.FindCfRayHeader(req)
 	lbProbe := connection.IsLBProbeRequest(req)
+	p.appendTagHeaders(req)
 
 	rule, ruleNum := p.ingressRules.FindMatchingRule(req.Host, req.URL.Path)
 	logFields := logFields{

origin/proxy_test.go

@@ -30,7 +30,7 @@ import (
 )
 
 var (
-	testTags                 = []tunnelpogs.Tag(nil)
+	testTags                 = []tunnelpogs.Tag{tunnelpogs.Tag{Name: "Name", Value: "value"}}
 	unusedWarpRoutingService = (*ingress.WarpRoutingService)(nil)
 )
 
@@ -150,6 +150,9 @@ func testProxyHTTP(proxy connection.OriginProxy) func(t *testing.T) {
 
 		err = proxy.ProxyHTTP(responseWriter, req, false)
 		require.NoError(t, err)
+		for _, tag := range testTags {
+			assert.Equal(t, tag.Value, req.Header.Get(TagHeaderNamePrefix+tag.Name))
+		}
 
 		assert.Equal(t, http.StatusOK, responseWriter.Code)
 	}