From 44d913657ad957c9678d3445e267096b43c89e96 Mon Sep 17 00:00:00 2001
From: calgor <ahomayoni684@gmail.com>
Date: Fri, 14 Apr 2023 10:23:44 +0330
Subject: [PATCH 1/3] Add handling for empty content type in request header

---
 bind.go | 4 +++-
 echo.go | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/bind.go b/bind.go
index c841ca010..5d84c9e5a 100644
--- a/bind.go
+++ b/bind.go
@@ -90,6 +90,8 @@ func (b *DefaultBinder) BindBody(c Context, i interface{}) (err error) {
 		if err = b.bindData(i, params, "form"); err != nil {
 			return NewHTTPError(http.StatusBadRequest, err.Error()).SetInternal(err)
 		}
+	case ctype == "":
+		return ErrEmptyContentType
 	default:
 		return ErrUnsupportedMediaType
 	}
@@ -114,7 +116,7 @@ func (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {
 	// Only bind query parameters for GET/DELETE/HEAD to avoid unexpected behavior with destination struct binding from body.
 	// For example a request URL `&id=1&lang=en` with body `{"id":100,"lang":"de"}` would lead to precedence issues.
 	// The HTTP method check restores pre-v4.1.11 behavior to avoid these problems (see issue #1670)
-  method := c.Request().Method
+	method := c.Request().Method
 	if method == http.MethodGet || method == http.MethodDelete || method == http.MethodHead {
 		if err = b.BindQueryParams(c, i); err != nil {
 			return err
diff --git a/echo.go b/echo.go
index 085a3a7f2..f8898bcb3 100644
--- a/echo.go
+++ b/echo.go
@@ -338,6 +338,7 @@ var (
 	ErrCookieNotFound         = errors.New("cookie not found")
 	ErrInvalidCertOrKeyType   = errors.New("invalid cert or key type, must be string or []byte")
 	ErrInvalidListenerNetwork = errors.New("invalid listener network")
+	ErrEmptyContentType       = errors.New("empty content type")
 )
 
 // Error handlers

From bfe99ab14e258d57b041bfe23eecad31c28b860c Mon Sep 17 00:00:00 2001
From: calgor <ahomayoni684@gmail.com>
Date: Mon, 17 Apr 2023 08:57:41 +0330
Subject: [PATCH 2/3] fixed the error type

---
 echo.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/echo.go b/echo.go
index f8898bcb3..b92242862 100644
--- a/echo.go
+++ b/echo.go
@@ -338,7 +338,7 @@ var (
 	ErrCookieNotFound         = errors.New("cookie not found")
 	ErrInvalidCertOrKeyType   = errors.New("invalid cert or key type, must be string or []byte")
 	ErrInvalidListenerNetwork = errors.New("invalid listener network")
-	ErrEmptyContentType       = errors.New("empty content type")
+	ErrEmptyContentType       = ErrUnsupportedMediaType.WithInternal(errors.New("missing content type header"))
 )
 
 // Error handlers

From 774c166dd7088edf7964c01a6e500c1b4a9466c1 Mon Sep 17 00:00:00 2001
From: calgor <ahomayoni684@gmail.com>
Date: Tue, 18 Apr 2023 08:28:23 +0330
Subject: [PATCH 3/3] added testing for empty Content-Type

---
 bind_test.go   | 9 +++++++++
 binder_test.go | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/bind_test.go b/bind_test.go
index c35283dcf..dc6885a1a 100644
--- a/bind_test.go
+++ b/bind_test.go
@@ -429,6 +429,10 @@ func TestBindUnsupportedMediaType(t *testing.T) {
 	testBindError(t, strings.NewReader(invalidContent), MIMEApplicationJSON, &json.SyntaxError{})
 }
 
+func TestBindErrEmptyContentType(t *testing.T) {
+	testBindError(t, strings.NewReader(invalidContent), "", errors.New("missing content type header"))
+}
+
 func TestBindbindData(t *testing.T) {
 	ts := new(bindTestStruct)
 	b := new(DefaultBinder)
@@ -674,6 +678,11 @@ func testBindError(t *testing.T, r io.Reader, ctype string, expectedInternal err
 			assert.Equal(t, http.StatusBadRequest, err.(*HTTPError).Code)
 			assert.IsType(t, expectedInternal, err.(*HTTPError).Internal)
 		}
+	case ctype == "": // no content type
+		if assert.IsType(t, new(HTTPError), err) {
+			assert.Equal(t, ErrEmptyContentType, err)
+			assert.IsType(t, expectedInternal, err.(*HTTPError).Internal)
+		}
 	default:
 		if assert.IsType(t, new(HTTPError), err) {
 			assert.Equal(t, ErrUnsupportedMediaType, err)
diff --git a/binder_test.go b/binder_test.go
index 0b27cae64..b9b116d9a 100644
--- a/binder_test.go
+++ b/binder_test.go
@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/stretchr/testify/assert"
 	"io"
 	"math/big"
 	"net/http"
@@ -13,6 +12,8 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func createTestContext(URL string, body io.Reader, pathParams map[string]string) Context {