diff --git a/request/decoder.go b/request/decoder.go
index 54c6262..3452444 100644
--- a/request/decoder.go
+++ b/request/decoder.go
@@ -79,7 +79,10 @@ func decodeValidate(d *form.Decoder, v interface{}, p url.Values, in rest.ParamI
 func makeDecoder(in rest.ParamIn, formDecoder *form.Decoder, decoderFunc decoderFunc) valueDecoderFunc {
 	return func(r *http.Request, v interface{}, validator rest.Validator) error {
 		ct := r.Header.Get("Content-Type")
-		if in == rest.ParamInFormData && ct != "" && !strings.HasPrefix(ct, "multipart/form-data") && ct != "application/x-www-form-urlencoded" {
+		if in == rest.ParamInFormData && ct != "" && !compareContentType(
+			ct,
+			"multipart/form-data",
+		) && !compareContentType(ct, "application/x-www-form-urlencoded") {
 			return nil
 		}
 
@@ -147,7 +150,7 @@ func formDataToURLValues(r *http.Request) (url.Values, error) {
 		return nil, nil
 	}
 
-	if strings.HasPrefix(r.Header.Get("Content-Type"), "multipart/form-data") {
+	if compareContentType(r.Header.Get("Content-Type"), "multipart/form-data") {
 		err := r.ParseMultipartForm(defaultMaxMemory)
 		if err != nil {
 			return nil, err
@@ -168,7 +171,7 @@ func queryToURLValues(r *http.Request) (url.Values, error) {
 }
 
 func formToURLValues(r *http.Request) (url.Values, error) {
-	if strings.HasPrefix(r.Header.Get("Content-Type"), "multipart/form-data") {
+	if compareContentType(r.Header.Get("Content-Type"), "multipart/form-data") {
 		err := r.ParseMultipartForm(defaultMaxMemory)
 		if err != nil {
 			return nil, err
@@ -201,3 +204,15 @@ func contentTypeBodyToURLValues(r *http.Request) (url.Values, error) {
 		r.Header.Get("Content-Type"): []string{string(b)},
 	}, nil
 }
+
+func compareContentType(contentType, expectedContentType string) bool {
+	ct := strings.TrimSpace(strings.ToLower(contentType))
+	ect := strings.TrimSpace(strings.ToLower(expectedContentType))
+	if len(ct) < len(ect) {
+		return false
+	} else if len(ct) > len(ect) && ct[len(ect)] == ';' {
+		ct = ct[:len(ect)]
+	}
+
+	return ct == ect
+}
diff --git a/request/jsonbody.go b/request/jsonbody.go
index 788cab3..5bc6b1f 100644
--- a/request/jsonbody.go
+++ b/request/jsonbody.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"strings"
 	"sync"
 
 	"github.com/swaggest/rest"
@@ -72,8 +71,11 @@ func checkJSONBodyContentType(contentType string, tolerateFormData bool) (ret bo
 		return false, nil
 	}
 
-	if len(contentType) < 16 || strings.ToLower(contentType[0:16]) != "application/json" { // allow 'application/json;charset=UTF-8'
-		if tolerateFormData && (contentType == "application/x-www-form-urlencoded" || contentType == "multipart/form-data") {
+	if !compareContentType(contentType, "application/json") { // allow 'application/json;charset=UTF-8'
+		if tolerateFormData && (compareContentType(
+			contentType,
+			"application/x-www-form-urlencoded",
+		) || compareContentType(contentType, "multipart/form-data")) {
 			return true, nil
 		}
 
diff --git a/request/jsonbody_test.go b/request/jsonbody_test.go
index 3380b62..56f9ccd 100644
--- a/request/jsonbody_test.go
+++ b/request/jsonbody_test.go
@@ -14,7 +14,8 @@ import (
 
 func Test_decodeJSONBody(t *testing.T) {
 	createBody := bytes.NewReader(
-		[]byte(`{"amount": 123,"customerId": "248df4b7-aa70-47b8-a036-33ac447e668d","type": "withdraw"}`))
+		[]byte(`{"amount": 123,"customerId": "248df4b7-aa70-47b8-a036-33ac447e668d","type": "withdraw"}`),
+	)
 	createReq, err := http.NewRequest(http.MethodPost, "/US/order/348df4b7-aa70-47b8-a036-33ac447e668d", createBody)
 	assert.NoError(t, err)
 
@@ -30,9 +31,11 @@ func Test_decodeJSONBody(t *testing.T) {
 	assert.Equal(t, "248df4b7-aa70-47b8-a036-33ac447e668d", i.CustomerID)
 	assert.Equal(t, "withdraw", i.Type)
 
-	vl := rest.ValidatorFunc(func(_ rest.ParamIn, _ map[string]interface{}) error {
-		return nil
-	})
+	vl := rest.ValidatorFunc(
+		func(_ rest.ParamIn, _ map[string]interface{}) error {
+			return nil
+		},
+	)
 
 	i = Input{}
 	_, err = createBody.Seek(0, io.SeekStart)
@@ -90,9 +93,11 @@ func Test_decodeJSONBody_validateFailed(t *testing.T) {
 
 	var i []int
 
-	vl := rest.ValidatorFunc(func(_ rest.ParamIn, _ map[string]interface{}) error {
-		return errors.New("failed")
-	})
+	vl := rest.ValidatorFunc(
+		func(_ rest.ParamIn, _ map[string]interface{}) error {
+			return errors.New("failed")
+		},
+	)
 
 	err = decodeJSONBody(readJSON, false)(req, &i, vl)
 	assert.EqualError(t, err, "failed")
@@ -100,22 +105,29 @@ func Test_decodeJSONBody_validateFailed(t *testing.T) {
 
 func Test_decodeJSONBody_tolerateFormData(t *testing.T) {
 	createBody := bytes.NewReader(
-		[]byte(`amount=123&customerId=248df4b7-aa70-47b8-a036-33ac447e668d&type=withdraw`))
-	createReq, err := http.NewRequest(http.MethodPost, "/US/order/348df4b7-aa70-47b8-a036-33ac447e668d", createBody)
-	createReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-	assert.NoError(t, err)
-
-	type Input struct {
-		Amount     int    `json:"amount" formData:"amount"`
-		CustomerID string `json:"customerId" formData:"customerId"`
-		Type       string `json:"type" formData:"type"`
+		[]byte(`amount=123&customerId=248df4b7-aa70-47b8-a036-33ac447e668d&type=withdraw`),
+	)
+	for _, h := range []string{
+		"application/x-www-form-urlencoded",
+		"multipart/form-data",
+		"multipart/form-data; boundary=--bound--",
+	} {
+		createReq, err := http.NewRequest(http.MethodPost, "/US/order/348df4b7-aa70-47b8-a036-33ac447e668d", createBody)
+		createReq.Header.Set("Content-Type", h)
+		assert.NoError(t, err)
+
+		type Input struct {
+			Amount     int    `json:"amount" formData:"amount"`
+			CustomerID string `json:"customerId" formData:"customerId"`
+			Type       string `json:"type" formData:"type"`
+		}
+
+		i := Input{}
+		assert.NoError(t, decodeJSONBody(readJSON, true)(createReq, &i, nil))
+		assert.Empty(t, i.Amount)
+		assert.Empty(t, i.CustomerID)
+		assert.Empty(t, i.Type)
 	}
-
-	i := Input{}
-	assert.NoError(t, decodeJSONBody(readJSON, true)(createReq, &i, nil))
-	assert.Empty(t, i.Amount)
-	assert.Empty(t, i.CustomerID)
-	assert.Empty(t, i.Type)
 }
 
 func Test_decodeJSONBody_charset(t *testing.T) {