fix: return "Bad Gateway" when there's no destination and add some un…

…it tests

webproxy/webproxy.go

@@ -1,7 +1,6 @@
 package webproxy
 
 import (
-	"fmt"
 	"github.com/gofiber/fiber/v2"
 	"github.com/valyala/fasthttp"
 	"io"
@@ -49,7 +48,7 @@ func (s *WebProxy) handleHTTP(c *fiber.Ctx) error {
 	// send request and receive response
 	var resp fiber.Response
 	if err := agent.DoTimeout(req, &resp, s.TunnelTimeout); err != nil {
-		return err
+		return c.SendStatus(fiber.StatusBadGateway)
 	}
 
 	// copy response headers
@@ -63,8 +62,7 @@ func (s *WebProxy) handleHTTP(c *fiber.Ctx) error {
 func (s *WebProxy) handleTunneling(c *fiber.Ctx) error {
 	destConn, err := fasthttp.DialTimeout(c.OriginalURL(), s.TunnelTimeout)
 	if err != nil {
-		fmt.Println(err)
-		return c.Status(fiber.StatusServiceUnavailable).SendString(err.Error())
+		return c.SendStatus(fiber.StatusBadGateway)
 	}
 
 	// hijack the client connection from the HTTP server

webproxy/webproxy_test.go

@@ -76,7 +76,7 @@ func Test_Middleware_WebProxy_HTTPS(t *testing.T) {
 	appProxy := fiber.New(fiber.Config{
 		DisableStartupMessage: true,
 	})
-	proxy := New(time.Second * 5)
+	proxy := New(3 * time.Second)
 	appProxy.All("*", proxy.Handler)
 
 	tlsconf, _, err := getTLSConfigs()
@@ -122,6 +122,13 @@ func Test_Middleware_WebProxy_HTTPS(t *testing.T) {
 	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "Hello, World!", string(body))
+
+	client2 := &http.Client{
+		Transport: transport,
+	}
+
+	_, err = client2.Get("https://wronghost")
+	utils.AssertEqual(t, "Get \"https://wronghost\": Bad Gateway", err.Error())
 }
 
 // getTLSConfigs returns a server and client TLS config