refactor: move json related header vars to internal (#1840)

* refactor: move json related header vars to internal

* refactor: use header.ContentType

rest/httpx/requests.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/zeromicro/go-zero/core/mapping"
 	"github.com/zeromicro/go-zero/rest/internal/encoding"
+	"github.com/zeromicro/go-zero/rest/internal/header"
 	"github.com/zeromicro/go-zero/rest/pathvar"
 )
 
@@ -114,5 +115,5 @@ func ParsePath(r *http.Request, v interface{}) error {
 }
 
 func withJsonBody(r *http.Request) bool {
-	return r.ContentLength > 0 && strings.Contains(r.Header.Get(ContentType), ApplicationJson)
+	return r.ContentLength > 0 && strings.Contains(r.Header.Get(header.ContentType), header.ApplicationJson)
 }

rest/httpx/requests_test.go

@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/zeromicro/go-zero/rest/internal/header"
 	"github.com/zeromicro/go-zero/rest/pathvar"
 )
 
@@ -204,7 +205,7 @@ func TestParseJsonBody(t *testing.T) {
 
 		body := `{"name":"kevin", "age": 18}`
 		r := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(body))
-		r.Header.Set(ContentType, ApplicationJson)
+		r.Header.Set(ContentType, header.JsonContentType)
 
 		assert.Nil(t, Parse(r, &v))
 		assert.Equal(t, "kevin", v.Name)
@@ -267,7 +268,7 @@ func TestParseHeaders(t *testing.T) {
 	request.Header.Add("addrs", "addr2")
 	request.Header.Add("X-Forwarded-For", "10.0.10.11")
 	request.Header.Add("x-real-ip", "10.0.11.10")
-	request.Header.Add("Accept", "application/json")
+	request.Header.Add("Accept", header.JsonContentType)
 	err = ParseHeaders(request, &v)
 	if err != nil {
 		t.Fatal(err)
@@ -277,7 +278,7 @@ func TestParseHeaders(t *testing.T) {
 	assert.Equal(t, []string{"addr1", "addr2"}, v.Addrs)
 	assert.Equal(t, "10.0.10.11", v.XForwardedFor)
 	assert.Equal(t, "10.0.11.10", v.XRealIP)
-	assert.Equal(t, "application/json", v.Accept)
+	assert.Equal(t, header.JsonContentType, v.Accept)
 }
 
 func TestParseHeaders_Error(t *testing.T) {

rest/httpx/responses.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 
 	"github.com/zeromicro/go-zero/core/logx"
+	"github.com/zeromicro/go-zero/rest/internal/header"
 )
 
 var (
@@ -67,7 +68,7 @@ func WriteJson(w http.ResponseWriter, code int, v interface{}) {
 		return
 	}
 
-	w.Header().Set(ContentType, ApplicationJson)
+	w.Header().Set(ContentType, header.JsonContentType)
 	w.WriteHeader(code)
 
 	if n, err := w.Write(bs); err != nil {

rest/httpx/vars.go

@@ -1,14 +1,16 @@
 package httpx
 
+import "github.com/zeromicro/go-zero/rest/internal/header"
+
 const (
-	// ApplicationJson means application/json.
-	ApplicationJson = "application/json; charset=utf-8"
 	// ContentEncoding means Content-Encoding.
 	ContentEncoding = "Content-Encoding"
 	// ContentSecurity means X-Content-Security.
 	ContentSecurity = "X-Content-Security"
 	// ContentType means Content-Type.
-	ContentType = "Content-Type"
+	ContentType = header.ContentType
+	// JsonContentType means application/json.
+	JsonContentType = header.JsonContentType
 	// KeyField means key.
 	KeyField = "key"
 	// SecretField means secret.