diff --git a/proxy/api.go b/proxy/api.go
index 26799c907b3..b12fddf240a 100644
--- a/proxy/api.go
+++ b/proxy/api.go
@@ -5,7 +5,9 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"net/http"
+	"os"
 	"strings"
 	"sync"
 	"time"
@@ -235,9 +237,13 @@ func (v *systemAPI) Run(ctx context.Context) error {
 			apiError(ctx, w, r, err)
 		}
 
-		apiResponse(ctx, w, r, map[string]string{
-			"signature": Signature(),
-			"version":   Version(),
+		type Response struct {
+			Code int    `json:"code"`
+			PID  string `json:"pid"`
+		}
+
+		apiResponse(ctx, w, r, &Response{
+			Code: 0, PID: fmt.Sprintf("%v", os.Getpid()),
 		})
 	})
 
diff --git a/proxy/env.go b/proxy/env.go
index dfe582014cb..8ec2b0e8254 100644
--- a/proxy/env.go
+++ b/proxy/env.go
@@ -21,7 +21,7 @@ func loadEnvFile(ctx context.Context) error {
 	} else {
 		envFile := path.Join(workDir, ".env")
 		if _, err := os.Stat(envFile); err == nil {
-			if err := godotenv.Overload(envFile); err != nil {
+			if err := godotenv.Load(envFile); err != nil {
 				return errors.Wrapf(err, "load %v", envFile)
 			}
 		}
@@ -50,6 +50,8 @@ func buildDefaultEnvironmentVariables(ctx context.Context) {
 	setEnvDefault("PROXY_SRT_SERVER", "20080")
 	// The API server of proxy itself.
 	setEnvDefault("PROXY_SYSTEM_API", "12025")
+	// The static directory for web server.
+	setEnvDefault("PROXY_STATIC_FILES", "../trunk/research")
 
 	// The load balancer, use redis or memory.
 	setEnvDefault("PROXY_LOAD_BALANCER_TYPE", "memory")
@@ -79,7 +81,7 @@ func buildDefaultEnvironmentVariables(ctx context.Context) {
 		"PROXY_FORCE_QUIT_TIMEOUT=%v, PROXY_GRACE_QUIT_TIMEOUT=%v, "+
 		"PROXY_HTTP_API=%v, PROXY_HTTP_SERVER=%v, PROXY_RTMP_SERVER=%v, "+
 		"PROXY_WEBRTC_SERVER=%v, PROXY_SRT_SERVER=%v, "+
-		"PROXY_SYSTEM_API=%v, PROXY_DEFAULT_BACKEND_ENABLED=%v, "+
+		"PROXY_SYSTEM_API=%v, PROXY_STATIC_FILES=%v, PROXY_DEFAULT_BACKEND_ENABLED=%v, "+
 		"PROXY_DEFAULT_BACKEND_IP=%v, PROXY_DEFAULT_BACKEND_RTMP=%v, "+
 		"PROXY_DEFAULT_BACKEND_HTTP=%v, PROXY_DEFAULT_BACKEND_API=%v, "+
 		"PROXY_DEFAULT_BACKEND_RTC=%v, PROXY_DEFAULT_BACKEND_SRT=%v, "+
@@ -89,7 +91,7 @@ func buildDefaultEnvironmentVariables(ctx context.Context) {
 		envForceQuitTimeout(), envGraceQuitTimeout(),
 		envHttpAPI(), envHttpServer(), envRtmpServer(),
 		envWebRTCServer(), envSRTServer(),
-		envSystemAPI(), envDefaultBackendEnabled(),
+		envSystemAPI(), envStaticFiles(), envDefaultBackendEnabled(),
 		envDefaultBackendIP(), envDefaultBackendRTMP(),
 		envDefaultBackendHttp(), envDefaultBackendAPI(),
 		envDefaultBackendRTC(), envDefaultBackendSRT(),
@@ -98,6 +100,10 @@ func buildDefaultEnvironmentVariables(ctx context.Context) {
 	)
 }
 
+func envStaticFiles() string {
+	return os.Getenv("PROXY_STATIC_FILES")
+}
+
 func envDefaultBackendSRT() string {
 	return os.Getenv("PROXY_DEFAULT_BACKEND_SRT")
 }
diff --git a/proxy/http.go b/proxy/http.go
index 7f66c8ee164..4bfa133b976 100644
--- a/proxy/http.go
+++ b/proxy/http.go
@@ -91,6 +91,17 @@ func (v *httpServer) Run(ctx context.Context) error {
 		apiResponse(ctx, w, r, &res)
 	})
 
+	// The static web server, for the web pages.
+	var staticServer http.Handler
+	if staticFiles := envStaticFiles(); staticFiles != "" {
+		if _, err := os.Stat(staticFiles); err != nil {
+			return errors.Wrapf(err, "invalid static files %v", staticFiles)
+		}
+
+		staticServer = http.FileServer(http.Dir(staticFiles))
+		logger.Df(ctx, "Handle static files at %v", staticFiles)
+	}
+
 	// The default handler, for both static web server and streaming server.
 	logger.Df(ctx, "Handle / by %v", addr)
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
@@ -132,6 +143,12 @@ func (v *httpServer) Run(ctx context.Context) error {
 			return
 		}
 
+		// Serve by static server.
+		if staticServer != nil {
+			staticServer.ServeHTTP(w, r)
+			return
+		}
+
 		http.NotFound(w, r)
 	})