diff --git a/binding/binding_test.go b/binding/binding_test.go
index 1044e6c2..c9dea347 100644
--- a/binding/binding_test.go
+++ b/binding/binding_test.go
@@ -61,6 +61,10 @@ type FooStructForMapType struct {
 	MapFoo map[string]interface{} `form:"map_foo"`
 }
 
+type FooStructForIgnoreFormTag struct {
+	Foo *string `form:"-"`
+}
+
 type InvalidNameType struct {
 	TestName string `invalid_name:"test_name"`
 }
@@ -278,6 +282,12 @@ func TestBindingFormForTime2(t *testing.T) {
 		"", "")
 }
 
+func TestFormBindingIgnoreField(t *testing.T) {
+	testFormBindingIgnoreField(t, "POST",
+		"/", "/",
+		"-=bar", "")
+}
+
 func TestBindingFormInvalidName(t *testing.T) {
 	testFormBindingInvalidName(t, "POST",
 		"/", "/",
@@ -860,6 +870,21 @@ func testFormBindingForTimeFailLocation(t *testing.T, method, path, badPath, bod
 	assert.Error(t, err)
 }
 
+func testFormBindingIgnoreField(t *testing.T, method, path, badPath, body, badBody string) {
+	b := Form
+	assert.Equal(t, "form", b.Name())
+
+	obj := FooStructForIgnoreFormTag{}
+	req := requestWithBody(method, path, body)
+	if method == "POST" {
+		req.Header.Add("Content-Type", MIMEPOSTForm)
+	}
+	err := b.Bind(req, &obj)
+	assert.NoError(t, err)
+
+	assert.Nil(t, obj.Foo)
+}
+
 func testFormBindingInvalidName(t *testing.T, method, path, badPath, body, badBody string) {
 	b := Form
 	assert.Equal(t, "form", b.Name())
diff --git a/binding/form_mapping.go b/binding/form_mapping.go
index 8900ab70..8eb5c0d1 100644
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@@ -41,6 +41,9 @@ func mapFormByTag(ptr interface{}, form map[string][]string, tag string) error {
 				defaultValue = defaultList[1]
 			}
 		}
+		if inputFieldName == "-" {
+			continue
+		}
 		if inputFieldName == "" {
 			inputFieldName = typeField.Name
 
diff --git a/gin.go b/gin.go
index 6e5ea6d7..ad64c35f 100644
--- a/gin.go
+++ b/gin.go
@@ -318,6 +318,7 @@ func (engine *Engine) RunUnix(file string) (err error) {
 		return
 	}
 	defer listener.Close()
+	os.Chmod(file, 0777)
 	err = http.Serve(listener, engine)
 	return
 }
diff --git a/logger.go b/logger.go
index 6d8f838e..dc639975 100644
--- a/logger.go
+++ b/logger.go
@@ -64,15 +64,62 @@ type LogFormatterParams struct {
 	ErrorMessage string
 	// IsTerm shows whether does gin's output descriptor refers to a terminal.
 	IsTerm bool
+	// BodySize is the size of the Response Body
+	BodySize int
+}
+
+// StatusCodeColor is the ANSI color for appropriately logging http status code to a terminal.
+func (p *LogFormatterParams) StatusCodeColor() string {
+	code := p.StatusCode
+
+	switch {
+	case code >= http.StatusOK && code < http.StatusMultipleChoices:
+		return green
+	case code >= http.StatusMultipleChoices && code < http.StatusBadRequest:
+		return white
+	case code >= http.StatusBadRequest && code < http.StatusInternalServerError:
+		return yellow
+	default:
+		return red
+	}
+}
+
+// MethodColor is the ANSI color for appropriately logging http method to a terminal.
+func (p *LogFormatterParams) MethodColor() string {
+	method := p.Method
+
+	switch method {
+	case "GET":
+		return blue
+	case "POST":
+		return cyan
+	case "PUT":
+		return yellow
+	case "DELETE":
+		return red
+	case "PATCH":
+		return green
+	case "HEAD":
+		return magenta
+	case "OPTIONS":
+		return white
+	default:
+		return reset
+	}
+}
+
+// ResetColor resets all escape attributes.
+func (p *LogFormatterParams) ResetColor() string {
+	return reset
 }
 
 // defaultLogFormatter is the default log format function Logger middleware uses.
 var defaultLogFormatter = func(param LogFormatterParams) string {
 	var statusColor, methodColor, resetColor string
 	if param.IsTerm {
-		statusColor = colorForStatus(param.StatusCode)
-		methodColor = colorForMethod(param.Method)
-		resetColor = reset
+		statusColor = param.StatusCodeColor()
+		methodColor = param.MethodColor()
+		resetColor = param.ResetColor()
 	}
 
 	return fmt.Sprintf("[GIN] %v |%s %3d %s| %13v | %15s |%s %-7s %s %s\n%s",
@@ -191,6 +238,8 @@ func LoggerWithConfig(conf LoggerConfig) HandlerFunc {
 			param.StatusCode = c.Writer.Status()
 			param.ErrorMessage = c.Errors.ByType(ErrorTypePrivate).String()
 
+			param.BodySize = c.Writer.Size()
+
 			if raw != "" {
 				path = path + "?" + raw
 			}
@@ -201,37 +250,3 @@ func LoggerWithConfig(conf LoggerConfig) HandlerFunc {
 		}
 	}
 }
-
-func colorForStatus(code int) string {
-	switch {
-	case code >= http.StatusOK && code < http.StatusMultipleChoices:
-		return green
-	case code >= http.StatusMultipleChoices && code < http.StatusBadRequest:
-		return white
-	case code >= http.StatusBadRequest && code < http.StatusInternalServerError:
-		return yellow
-	default:
-		return red
-	}
-}
-
-func colorForMethod(method string) string {
-	switch method {
-	case "GET":
-		return blue
-	case "POST":
-		return cyan
-	case "PUT":
-		return yellow
-	case "DELETE":
-		return red
-	case "PATCH":
-		return green
-	case "HEAD":
-		return magenta
-	case "OPTIONS":
-		return white
-	default:
-		return reset
-	}
-}
diff --git a/logger_test.go b/logger_test.go
index 8770b5fb..c551677a 100644
--- a/logger_test.go
+++ b/logger_test.go
@@ -257,6 +257,13 @@ func TestDefaultLogFormatter(t *testing.T) {
 }
 
 func TestColorForMethod(t *testing.T) {
+	colorForMethod := func(method string) string {
+		p := LogFormatterParams{
+			Method: method,
+		}
+		return p.MethodColor()
+	}
+
 	assert.Equal(t, string([]byte{27, 91, 57, 55, 59, 52, 52, 109}), colorForMethod("GET"), "get should be blue")
 	assert.Equal(t, string([]byte{27, 91, 57, 55, 59, 52, 54, 109}), colorForMethod("POST"), "post should be cyan")
 	assert.Equal(t, string([]byte{27, 91, 57, 48, 59, 52, 51, 109}), colorForMethod("PUT"), "put should be yellow")
@@ -268,12 +275,24 @@ func TestColorForMethod(t *testing.T) {
 }
 
 func TestColorForStatus(t *testing.T) {
+	colorForStatus := func(code int) string {
+		p := LogFormatterParams{
+			StatusCode: code,
+		}
+		return p.StatusCodeColor()
+	}
+
 	assert.Equal(t, string([]byte{27, 91, 57, 55, 59, 52, 50, 109}), colorForStatus(http.StatusOK), "2xx should be green")
 	assert.Equal(t, string([]byte{27, 91, 57, 48, 59, 52, 55, 109}), colorForStatus(http.StatusMovedPermanently), "3xx should be white")
 	assert.Equal(t, string([]byte{27, 91, 57, 48, 59, 52, 51, 109}), colorForStatus(http.StatusNotFound), "4xx should be yellow")
 	assert.Equal(t, string([]byte{27, 91, 57, 55, 59, 52, 49, 109}), colorForStatus(2), "other things should be red")
 }
 
+func TestResetColor(t *testing.T) {
+	p := LogFormatterParams{}
+	assert.Equal(t, string([]byte{27, 91, 48, 109}), p.ResetColor())
+}
+
 func TestErrorLogger(t *testing.T) {
 	router := New()
 	router.Use(ErrorLogger())
diff --git a/mode.go b/mode.go
index f787b5ca..8aa84aa8 100644
--- a/mode.go
+++ b/mode.go
@@ -11,8 +11,8 @@ import (
 	"github.com/gin-gonic/gin/binding"
 )
 
-// ENV_GIN_MODE indicates environment name for gin mode.
-const ENV_GIN_MODE = "GIN_MODE"
+// EnvGinMode indicates environment name for gin mode.
+const EnvGinMode = "GIN_MODE"
 
 const (
 	// DebugMode indicates gin mode is debug.
@@ -44,7 +44,7 @@ var ginMode = debugCode
 var modeName = DebugMode
 
 func init() {
-	mode := os.Getenv(ENV_GIN_MODE)
+	mode := os.Getenv(EnvGinMode)
 	SetMode(mode)
 }
 
diff --git a/mode_test.go b/mode_test.go
index cf27acd8..3dba5150 100644
--- a/mode_test.go
+++ b/mode_test.go
@@ -13,13 +13,13 @@ import (
 )
 
 func init() {
-	os.Setenv(ENV_GIN_MODE, TestMode)
+	os.Setenv(EnvGinMode, TestMode)
 }
 
 func TestSetMode(t *testing.T) {
 	assert.Equal(t, testCode, ginMode)
 	assert.Equal(t, TestMode, Mode())
-	os.Unsetenv(ENV_GIN_MODE)
+	os.Unsetenv(EnvGinMode)
 
 	SetMode("")
 	assert.Equal(t, debugCode, ginMode)
diff --git a/render/reader.go b/render/reader.go
index ab60e53a..312af741 100644
--- a/render/reader.go
+++ b/render/reader.go
@@ -36,8 +36,8 @@ func (r Reader) WriteContentType(w http.ResponseWriter) {
 func (r Reader) writeHeaders(w http.ResponseWriter, headers map[string]string) {
 	header := w.Header()
 	for k, v := range headers {
-		if val := header[k]; len(val) == 0 {
-			header[k] = []string{v}
+		if header.Get(k) == "" {
+			header.Set(k, v)
 		}
 	}
 }
diff --git a/render/render_test.go b/render/render_test.go
index 3df04a17..76e29eeb 100644
--- a/render/render_test.go
+++ b/render/render_test.go
@@ -470,6 +470,7 @@ func TestRenderReader(t *testing.T) {
 	body := "#!PNG some raw data"
 	headers := make(map[string]string)
 	headers["Content-Disposition"] = `attachment; filename="filename.png"`
+	headers["x-request-id"] = "requestId"
 
 	err := (Reader{
 		ContentLength: int64(len(body)),
@@ -483,4 +484,5 @@ func TestRenderReader(t *testing.T) {
 	assert.Equal(t, "image/png", w.Header().Get("Content-Type"))
 	assert.Equal(t, strconv.Itoa(len(body)), w.Header().Get("Content-Length"))
 	assert.Equal(t, headers["Content-Disposition"], w.Header().Get("Content-Disposition"))
+	assert.Equal(t, headers["x-request-id"], w.Header().Get("x-request-id"))
 }