Closes #364

Signed-off-by: Vishal Rana <vr@labstack.com>

echo.go

@@ -230,7 +230,7 @@ func New() (e *Echo) {
 	e.SetHTTPErrorHandler(e.DefaultHTTPErrorHandler)
 	e.SetBinder(&binder{})
 	l := glog.New("echo")
-	l.SetLevel(glog.ERROR)
+	l.SetLevel(glog.OFF)
 	e.SetLogger(l)
 	return
 }
@@ -576,7 +576,9 @@ func (e *Echo) Run(s engine.Server) {
 		e.SetLogLevel(glog.DEBUG)
 		e.logger.Debug("running in debug mode")
 	}
-	e.logger.Error(s.Start())
+	if err := s.Start(); err != nil {
+		panic(fmt.Sprintf("echo: %v", err))
+	}
 }
 
 // NewHTTPError creates a new HTTPError instance.

engine/fasthttp/server.go

@@ -80,7 +80,7 @@ func WithConfig(c engine.Config) (s *Server) {
 			},
 		},
 		handler: engine.HandlerFunc(func(req engine.Request, res engine.Response) {
-			s.logger.Error("handler not set, use `SetHandler()` to set it.")
+			panic("echo: handler not set, use `Server#SetHandler()` to set it.")
 		}),
 		logger: glog.New("echo"),
 	}

engine/standard/request.go

@@ -1,6 +1,7 @@
 package standard
 
 import (
+	"fmt"
 	"io"
 	"io/ioutil"
 	"mime/multipart"
@@ -151,11 +152,11 @@ func (r *Request) FormValue(name string) string {
 func (r *Request) FormParams() map[string][]string {
 	if strings.HasPrefix(r.header.Get(echo.HeaderContentType), echo.MIMEMultipartForm) {
 		if err := r.ParseMultipartForm(defaultMemory); err != nil {
-			r.logger.Error(err)
+			panic(fmt.Sprintf("echo: %v", err))
 		}
 	} else {
 		if err := r.ParseForm(); err != nil {
-			r.logger.Error(err)
+			panic(fmt.Sprintf("echo: %v", err))
 		}
 	}
 	return map[string][]string(r.Request.Form)

engine/standard/server.go

@@ -78,7 +78,7 @@ func WithConfig(c engine.Config) (s *Server) {
 			},
 		},
 		handler: engine.HandlerFunc(func(req engine.Request, res engine.Response) {
-			s.logger.Error("handler not set, use `SetHandler()` to set it.")
+			panic("echo: handler not set, use `Server#SetHandler()` to set it.")
 		}),
 		logger: glog.New("echo"),
 	}

router.go

@@ -54,7 +54,7 @@ func NewRouter(e *Echo) *Router {
 func (r *Router) Add(method, path string, h HandlerFunc, e *Echo) {
 	// Validate path
 	if path == "" {
-		e.logger.Fatal("path cannot be empty")
+		panic("echo: path cannot be empty")
 	}
 	if path[0] != '/' {
 		path = "/" + path

test/server.go

@@ -66,7 +66,7 @@ func NewConfig(c *engine.Config) (s *Server) {
 			},
 		},
 		handler: engine.HandlerFunc(func(req engine.Request, res engine.Response) {
-			s.logger.Fatal("handler not set")
+			panic("echo: handler not set, use `Server#SetHandler()` to set it.")
 		}),
 		logger: log.New("echo"),
 	}
@@ -81,16 +81,23 @@ func (s *Server) SetLogger(l *log.Logger) {
 	s.logger = l
 }
 
-func (s *Server) Start() {
+func (s *Server) Start() error {
-	s.Addr = s.config.Address
+	if s.config.Listener == nil {
-	s.Handler = s
+		return s.startDefaultListener()
-	certFile := s.config.TLSCertFile
-	keyFile := s.config.TLSKeyFile
-	if certFile != "" && keyFile != "" {
-		s.logger.Fatal(s.ListenAndServeTLS(certFile, keyFile))
-	} else {
-		s.logger.Fatal(s.ListenAndServe())
 	}
+	return s.startCustomListener()
+}
+
+func (s *Server) startDefaultListener() error {
+	c := s.config
+	if c.TLSCertFile != "" && c.TLSKeyFile != "" {
+		return s.ListenAndServeTLS(c.TLSCertFile, c.TLSKeyFile)
+	}
+	return s.ListenAndServe()
+}
+
+func (s *Server) startCustomListener() error {
+	return s.Serve(s.config.Listener)
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {