feat(proxy): add HTTP to HTTPS redirection support

conf/frpc_full_example.toml

@@ -275,6 +275,10 @@ localIP = "127.0.0.1"
 localPort = 8000
 subdomain = "web02"
 customDomains = ["web02.yourdomain.com"]
+# if true, frps will redirect plain HTTP requests for the domains above to HTTPS.
+# It requires vhostHTTPPort to be enabled on frps, and an HTTP proxy registered
+# on the same domain always takes precedence over the redirect.
+# httpRedirect = true
 # if not empty, frpc will use proxy protocol to transfer connection info to your local service
 # v1 or v2 or empty
 transport.proxyProtocolVersion = "v2"

conf/frps_full_example.toml

@@ -40,6 +40,12 @@ transport.maxPoolCount = 5
 # If negative, keep-alive probes are disabled.
 # transport.tcpKeepalive = 7200
 
+# proxyIdleTimeout specifies the maximum time in seconds that a proxied user connection
+# can stay open without any traffic in either direction before frps closes it.
+# It reclaims connections whose endpoints are still open at the TCP level but will never send data again.
+# By default, this value is 0, which disables the idle timeout.
+# transport.proxyIdleTimeout = 7200
+
 # transport.tls.force specifies whether to only accept TLS-encrypted connections. By default, the value is false.
 transport.tls.force = false
 
@@ -52,6 +58,12 @@ transport.tls.force = false
 vhostHTTPPort = 80
 vhostHTTPSPort = 443
 
+# Port used in the Location header when redirecting HTTP requests to HTTPS for
+# proxies with httpRedirect enabled. Set it when browsers reach the HTTPS vhost
+# through a port mapping, so it differs from vhostHTTPSPort.
+# By default, this value is vhostHTTPSPort.
+# vhostHTTPSRedirectPort = 443
+
 # Response header timeout(seconds) for vhost http server, default is 60s
 # vhostHTTPTimeout = 60
 

go.mod

@@ -97,5 +97,3 @@ require (
 
 // TODO(fatedier): Temporary use the modified version, update to the official version after merging into the official repository.
 replace github.com/hashicorp/yamux => github.com/fatedier/yamux v0.0.0-20250825093530-d0154be01cd6
-
-replace github.com/fatedier/golib => github.com/Lolia-FRP/golib v0.7.4

go.sum

@@ -2,8 +2,6 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 github.com/Azure/go-ntlmssp v0.1.0 h1:DjFo6YtWzNqNvQdrwEyr/e4nhU3vRiwenz5QX7sFz+A=
 github.com/Azure/go-ntlmssp v0.1.0/go.mod h1:NYqdhxd/8aAct/s4qSYZEerdPuH1liG2/X9DiVTbhpk=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/Lolia-FRP/golib v0.7.4 h1:EtUJChdgXVV9iU1xqB7PkD/1/3RgATbj3n86HbrLKMA=
-github.com/Lolia-FRP/golib v0.7.4/go.mod h1:ArUGvPg2cOw/py2RAuBt46nNZH2VQ5Z70p109MAZpJw=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
@@ -36,6 +34,8 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/fatedier/golib v0.7.0 h1:tMDF9ObcwVt59VUHroJOzHQjVFPLymZVMpGm9WAVwhY=
+github.com/fatedier/golib v0.7.0/go.mod h1:ArUGvPg2cOw/py2RAuBt46nNZH2VQ5Z70p109MAZpJw=
 github.com/fatedier/yamux v0.0.0-20250825093530-d0154be01cd6 h1:u92UUy6FURPmNsMBUuongRWC0rBqN6gd01Dzu+D21NE=
 github.com/fatedier/yamux v0.0.0-20250825093530-d0154be01cd6/go.mod h1:c5/tk6G0dSpXGzJN7Wk1OEie8grdSJAmeawId9Zvd34=
 github.com/go-jose/go-jose/v4 v4.0.5 h1:M6T8+mKZl/+fNNuFHvGIzDz7BTLQPIounk/b9dw3AaE=

pkg/config/v1/proxy.go

@@ -369,6 +369,12 @@ var _ ProxyConfigurer = &HTTPSProxyConfig{}
 type HTTPSProxyConfig struct {
 	ProxyBaseConfig
 	DomainConfig
+
+	// HTTPRedirect requests frps to redirect plain HTTP requests for the
+	// proxy's domains to their HTTPS endpoint. It only takes effect when
+	// frps has vhostHTTPPort enabled, and never overrides a real HTTP
+	// proxy registered on the same domain.
+	HTTPRedirect bool `json:"httpRedirect,omitempty"`
 }
 
 func (c *HTTPSProxyConfig) MarshalToMsg(m *msg.NewProxy) {
@@ -376,6 +382,7 @@ func (c *HTTPSProxyConfig) MarshalToMsg(m *msg.NewProxy) {
 
 	m.CustomDomains = c.CustomDomains
 	m.SubDomain = c.SubDomain
+	m.HTTPRedirect = c.HTTPRedirect
 }
 
 func (c *HTTPSProxyConfig) UnmarshalFromMsg(m *msg.NewProxy) {
@@ -383,6 +390,7 @@ func (c *HTTPSProxyConfig) UnmarshalFromMsg(m *msg.NewProxy) {
 
 	c.CustomDomains = m.CustomDomains
 	c.SubDomain = m.SubDomain
+	c.HTTPRedirect = m.HTTPRedirect
 }
 
 func (c *HTTPSProxyConfig) Clone() ProxyConfigurer {

pkg/config/v1/server.go

@@ -51,6 +51,12 @@ type ServerConfig struct {
 	// Vhost requests. If this value is 0, the server will not listen for HTTPS
 	// requests.
 	VhostHTTPSPort int `json:"vhostHTTPSPort,omitempty"`
+	// VhostHTTPSRedirectPort specifies the port used in the Location header
+	// when redirecting HTTP requests to HTTPS for proxies with httpRedirect
+	// enabled. Set it when browsers reach the HTTPS vhost through a port
+	// mapping, so it differs from VhostHTTPSPort. By default, this value is
+	// VhostHTTPSPort.
+	VhostHTTPSRedirectPort int `json:"vhostHTTPSRedirectPort,omitempty"`
 	// TCPMuxHTTPConnectPort specifies the port that the server listens for TCP
 	// HTTP CONNECT requests. If the value is 0, the server will not multiplex TCP
 	// requests on one single port. If it's not - it will listen on this value for
@@ -118,6 +124,7 @@ func (c *ServerConfig) Complete() error {
 	}
 
 	c.VhostHTTPTimeout = util.EmptyOr(c.VhostHTTPTimeout, 60)
+	c.VhostHTTPSRedirectPort = util.EmptyOr(c.VhostHTTPSRedirectPort, c.VhostHTTPSPort)
 	c.DetailedErrorsToClient = util.EmptyOr(c.DetailedErrorsToClient, lo.ToPtr(true))
 	c.UserConnTimeout = util.EmptyOr(c.UserConnTimeout, 10)
 	c.UDPPacketSize = util.EmptyOr(c.UDPPacketSize, 1500)
@@ -173,6 +180,12 @@ type ServerTransportConfig struct {
 	// before terminating the connection. It is not recommended to change this
 	// value. By default, this value is 90. Set negative value to disable it.
 	HeartbeatTimeout int64 `json:"heartbeatTimeout,omitempty"`
+	// ProxyIdleTimeout specifies the maximum time in seconds that a proxied
+	// user connection can stay open without any traffic in either direction
+	// before frps closes it. This reclaims connections whose endpoints are
+	// still open at the TCP level but will never send data again. By default,
+	// this value is 0, which disables the idle timeout.
+	ProxyIdleTimeout int64 `json:"proxyIdleTimeout,omitempty"`
 	// QUIC options.
 	QUIC QUICOptions `json:"quic,omitempty"`
 	// TLS specifies TLS settings for the connection from the client.

pkg/msg/msg.go

@@ -124,6 +124,7 @@ type NewProxy struct {
 	Headers           map[string]string `json:"headers,omitempty"`
 	ResponseHeaders   map[string]string `json:"response_headers,omitempty"`
 	RouteByHTTPUser   string            `json:"route_by_http_user,omitempty"`
+	HTTPRedirect      bool              `json:"http_redirect,omitempty"`
 
 	// stcp, sudp, xtcp
 	Sk         string   `json:"sk,omitempty"`

pkg/util/vhost/http.go

@@ -39,11 +39,15 @@ var ErrNoRouteFound = errors.New("no route found")
 
 type HTTPReverseProxyOptions struct {
 	ResponseHeaderTimeoutS int64
+	// HTTPSRedirector, if set, redirects requests whose host has no HTTP
+	// route but opted into HTTP to HTTPS redirection.
+	HTTPSRedirector *HTTPSRedirector
 }
 
 type HTTPReverseProxy struct {
-	proxy       http.Handler
+	proxy           http.Handler
-	vhostRouter *Routers
+	vhostRouter     *Routers
+	httpsRedirector *HTTPSRedirector
 
 	responseHeaderTimeout time.Duration
 }
@@ -55,6 +59,7 @@ func NewHTTPReverseProxy(option HTTPReverseProxyOptions, vhostRouter *Routers) *
 	rp := &HTTPReverseProxy{
 		responseHeaderTimeout: time.Duration(option.ResponseHeaderTimeoutS) * time.Second,
 		vhostRouter:           vhostRouter,
+		httpsRedirector:       option.HTTPSRedirector,
 	}
 	proxy := &httputil.ReverseProxy{
 		// Modify incoming requests by route policies.
@@ -281,6 +286,12 @@ func (rp *HTTPReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request)
 		return
 	}
 
+	// Hosts without any real HTTP route may still ask for a redirect to
+	// their HTTPS endpoint; registered HTTP routes always take precedence.
+	if rc == nil && rp.httpsRedirector != nil && rp.httpsRedirector.Redirect(rw, newreq) {
+		return
+	}
+
 	if req.Method == http.MethodConnect {
 		rp.connectHandler(rw, newreq)
 	} else {

pkg/util/vhost/https_redirect.go

@@ -0,0 +1,83 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vhost
+
+import (
+	"net/http"
+	"strconv"
+	"sync"
+
+	httppkg "github.com/fatedier/frp/pkg/util/http"
+)
+
+// HTTPSRedirector tracks domains of HTTPS proxies that opted into automatic
+// HTTP to HTTPS redirection. The HTTP reverse proxy consults it as a fallback
+// for hosts that have no real HTTP route, so registered HTTP proxies on the
+// same domain always take precedence over the redirect.
+type HTTPSRedirector struct {
+	mu      sync.RWMutex
+	domains map[string]int // domain -> number of proxies requesting the redirect
+	port    int            // port used in the redirect Location, as seen by browsers
+}
+
+func NewHTTPSRedirector(port int) *HTTPSRedirector {
+	return &HTTPSRedirector{
+		domains: make(map[string]int),
+		port:    port,
+	}
+}
+
+func (r *HTTPSRedirector) Add(domain string) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.domains[domain]++
+}
+
+func (r *HTTPSRedirector) Remove(domain string) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.domains[domain] <= 1 {
+		delete(r.domains, domain)
+	} else {
+		r.domains[domain]--
+	}
+}
+
+func (r *HTTPSRedirector) match(host string) bool {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	return r.domains[host] > 0
+}
+
+// Redirect responds with a redirect to the HTTPS endpoint of the requested
+// host if the host opted into redirection. It reports whether the request
+// was handled.
+func (r *HTTPSRedirector) Redirect(rw http.ResponseWriter, req *http.Request) bool {
+	if req.Method == http.MethodConnect {
+		return false
+	}
+	host, err := httppkg.CanonicalHost(req.Host)
+	if err != nil || !r.match(host) {
+		return false
+	}
+
+	target := "https://" + host
+	if r.port != 443 {
+		target += ":" + strconv.Itoa(r.port)
+	}
+	target += req.URL.RequestURI()
+	http.Redirect(rw, req, target, http.StatusMovedPermanently)
+	return true
+}

pkg/util/vhost/https_redirect_test.go

@@ -0,0 +1,46 @@
+package vhost
+
+import (
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestHTTPSRedirectorRedirect(t *testing.T) {
+	r := NewHTTPSRedirector(443)
+	r.Add("a.example.com")
+
+	// registered domain, port stripped from host, path and query preserved
+	req := httptest.NewRequest("GET", "http://a.example.com:8080/foo?x=1", nil)
+	rw := httptest.NewRecorder()
+	require.True(t, r.Redirect(rw, req))
+	require.Equal(t, 301, rw.Code)
+	require.Equal(t, "https://a.example.com/foo?x=1", rw.Header().Get("Location"))
+
+	// unknown domain is not handled
+	req = httptest.NewRequest("GET", "http://b.example.com/", nil)
+	require.False(t, r.Redirect(httptest.NewRecorder(), req))
+}
+
+func TestHTTPSRedirectorNonDefaultPort(t *testing.T) {
+	r := NewHTTPSRedirector(8443)
+	r.Add("a.example.com")
+
+	req := httptest.NewRequest("GET", "http://a.example.com/", nil)
+	rw := httptest.NewRecorder()
+	require.True(t, r.Redirect(rw, req))
+	require.Equal(t, "https://a.example.com:8443/", rw.Header().Get("Location"))
+}
+
+func TestHTTPSRedirectorRefCount(t *testing.T) {
+	r := NewHTTPSRedirector(443)
+	r.Add("a.example.com")
+	r.Add("a.example.com")
+
+	r.Remove("a.example.com")
+	require.True(t, r.match("a.example.com"), "domain removed while another proxy still references it")
+
+	r.Remove("a.example.com")
+	require.False(t, r.match("a.example.com"))
+}

server/controller/resource.go

@@ -50,6 +50,9 @@ type ResourceController struct {
 	// For HTTP proxies, forwarding HTTP requests
 	HTTPReverseProxy *vhost.HTTPReverseProxy
 
+	// Domains of HTTPS proxies that requested automatic HTTP to HTTPS redirection
+	HTTPSRedirector *vhost.HTTPSRedirector
+
 	// For HTTPS proxies, route requests to different clients by hostname and other information
 	VhostHTTPSMuxer *vhost.HTTPSMuxer
 

server/proxy/https.go

@@ -31,6 +31,9 @@ func init() {
 type HTTPSProxy struct {
 	*BaseProxy
 	cfg *v1.HTTPSProxyConfig
+
+	// domains registered for HTTP to HTTPS redirection, removed on Close
+	redirectDomains []string
 }
 
 func NewHTTPSProxy(baseProxy *BaseProxy) Proxy {
@@ -66,12 +69,28 @@ func (pxy *HTTPSProxy) Run() (remoteAddr string, err error) {
 		xl.Infof("https proxy listen for host [%s] group [%s]", domain, pxy.cfg.LoadBalancer.Group)
 	}
 
+	if pxy.cfg.HTTPRedirect {
+		if pxy.rc.HTTPSRedirector != nil {
+			for _, domain := range domains {
+				pxy.rc.HTTPSRedirector.Add(domain)
+			}
+			pxy.redirectDomains = domains
+			xl.Infof("https proxy enabled http redirect for hosts %v", domains)
+		} else {
+			xl.Warnf("httpRedirect is enabled but frps has no vhostHTTPPort or vhostHTTPSPort, ignored")
+		}
+	}
+
 	pxy.startCommonTCPListenersHandler()
 	remoteAddr = strings.Join(addrs, ",")
 	return
 }
 
 func (pxy *HTTPSProxy) Close() {
+	for _, domain := range pxy.redirectDomains {
+		pxy.rc.HTTPSRedirector.Remove(domain)
+	}
+	pxy.redirectDomains = nil
 	pxy.BaseProxy.Close()
 }
 

server/proxy/idle_watcher.go

@@ -0,0 +1,47 @@
+package proxy
+
+import (
+	"sync/atomic"
+	"time"
+)
+
+// idleWatcher closes a proxied connection pair when no bytes have flowed in
+// either direction for the configured timeout. Without it, endpoints that
+// stay open at the TCP level but never send data again would pin the join
+// goroutines and their transfer buffers forever.
+type idleWatcher struct {
+	lastActive atomic.Int64 // unix nano of the last byte transferred
+	stopCh     chan struct{}
+}
+
+func startIdleWatcher(timeout time.Duration, closeFn func()) *idleWatcher {
+	w := &idleWatcher{stopCh: make(chan struct{})}
+	w.touch()
+
+	go func() {
+		timer := time.NewTimer(timeout)
+		defer timer.Stop()
+		for {
+			select {
+			case <-w.stopCh:
+				return
+			case <-timer.C:
+				idle := time.Since(time.Unix(0, w.lastActive.Load()))
+				if idle >= timeout {
+					closeFn()
+					return
+				}
+				timer.Reset(timeout - idle)
+			}
+		}
+	}()
+	return w
+}
+
+func (w *idleWatcher) touch() {
+	w.lastActive.Store(time.Now().UnixNano())
+}
+
+func (w *idleWatcher) stop() {
+	close(w.stopCh)
+}

server/proxy/idle_watcher_test.go

@@ -0,0 +1,52 @@
+package proxy
+
+import (
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIdleWatcherClosesAfterTimeout(t *testing.T) {
+	closed := make(chan struct{})
+	w := startIdleWatcher(50*time.Millisecond, func() {
+		close(closed)
+	})
+	defer w.stop()
+
+	select {
+	case <-closed:
+	case <-time.After(time.Second):
+		t.Fatal("closeFn was not called after idle timeout")
+	}
+}
+
+func TestIdleWatcherTouchPostponesClose(t *testing.T) {
+	var closedFlag atomic.Bool
+	w := startIdleWatcher(100*time.Millisecond, func() {
+		closedFlag.Store(true)
+	})
+	defer w.stop()
+
+	// keep the connection "active" well past the timeout
+	for range 6 {
+		time.Sleep(30 * time.Millisecond)
+		w.touch()
+	}
+	require.False(t, closedFlag.Load(), "closeFn fired despite ongoing activity")
+
+	// once activity stops, it should still close
+	require.Eventually(t, closedFlag.Load, time.Second, 10*time.Millisecond)
+}
+
+func TestIdleWatcherStopPreventsClose(t *testing.T) {
+	var closedFlag atomic.Bool
+	w := startIdleWatcher(50*time.Millisecond, func() {
+		closedFlag.Store(true)
+	})
+	w.stop()
+
+	time.Sleep(150 * time.Millisecond)
+	require.False(t, closedFlag.Load(), "closeFn fired after watcher was stopped")
+}

server/proxy/proxy.go

@@ -317,15 +317,33 @@ func (pxy *BaseProxy) handleUserTCPConnection(userConn net.Conn) {
 
 	name := pxy.GetName()
 	proxyType := cfg.Type
+	var watcher *idleWatcher
+	touch := func() {
+		if watcher != nil {
+			watcher.touch()
+		}
+	}
 	local = wrapCountingReadWriteCloser(local, nil, func(bytes int64) {
+		touch()
 		metrics.Server.AddTrafficIn(name, proxyType, bytes)
 	})
 	userConn = netpkg.WrapReadWriteCloserToConn(
 		wrapCountingReadWriteCloser(userConn, nil, func(bytes int64) {
+			touch()
 			metrics.Server.AddTrafficOut(name, proxyType, bytes)
 		}),
 		userConn,
 	)
+	if idleTimeout := time.Duration(pxy.serverCfg.Transport.ProxyIdleTimeout) * time.Second; idleTimeout > 0 {
+		wrappedLocal, wrappedUserConn := local, userConn
+		watcher = startIdleWatcher(idleTimeout, func() {
+			xl.Infof("close user connection [%s] of proxy [%s]: no traffic in either direction for %s",
+				wrappedUserConn.RemoteAddr().String(), name, idleTimeout)
+			_ = wrappedUserConn.Close()
+			_ = wrappedLocal.Close()
+		})
+		defer watcher.stop()
+	}
 	metrics.Server.OpenConnection(name, proxyType)
 	// Traffic is counted incrementally via the counting wrappers above, so the
 	// byte totals returned by joinUserConnection are intentionally discarded here.

server/service.go

@@ -291,8 +291,14 @@ func NewService(cfg *v1.ServerConfig) (*Service, error) {
 
 	// Create http vhost muxer.
 	if cfg.VhostHTTPPort > 0 {
+		var redirector *vhost.HTTPSRedirector
+		if cfg.VhostHTTPSPort > 0 {
+			redirector = vhost.NewHTTPSRedirector(cfg.VhostHTTPSRedirectPort)
+			svr.rc.HTTPSRedirector = redirector
+		}
 		rp := vhost.NewHTTPReverseProxy(vhost.HTTPReverseProxyOptions{
 			ResponseHeaderTimeoutS: cfg.VhostHTTPTimeout,
+			HTTPSRedirector:        redirector,
 		}, svr.httpVhostRouter)
 		svr.rc.HTTPReverseProxy = rp