feat: support form values in gateway (#2158)

rest/httpx/requests.go

@@ -49,24 +49,11 @@ func ParseHeaders(r *http.Request, v interface{}) error {
 
 // ParseForm parses the form request.
 func ParseForm(r *http.Request, v interface{}) error {
-	if err := r.ParseForm(); err != nil {
+	params, err := GetFormValues(r)
+	if err != nil {
 		return err
 	}
 
-	if err := r.ParseMultipartForm(maxMemory); err != nil {
-		if err != http.ErrNotMultipart {
-			return err
-		}
-	}
-
-	params := make(map[string]interface{}, len(r.Form))
-	for name := range r.Form {
-		formValue := r.Form.Get(name)
-		if len(formValue) > 0 {
-			params[name] = formValue
-		}
-	}
-
 	return formUnmarshaler.Unmarshal(params, v)
 }
 

rest/httpx/util.go

@@ -4,6 +4,29 @@ import "net/http"
 
 const xForwardedFor = "X-Forwarded-For"
 
+// GetFormValues returns the form values.
+func GetFormValues(r *http.Request) (map[string]interface{}, error) {
+	if err := r.ParseForm(); err != nil {
+		return nil, err
+	}
+
+	if err := r.ParseMultipartForm(maxMemory); err != nil {
+		if err != http.ErrNotMultipart {
+			return nil, err
+		}
+	}
+
+	params := make(map[string]interface{}, len(r.Form))
+	for name := range r.Form {
+		formValue := r.Form.Get(name)
+		if len(formValue) > 0 {
+			params[name] = formValue
+		}
+	}
+
+	return params, nil
+}
+
 // GetRemoteAddr returns the peer address, supports X-Forward-For.
 func GetRemoteAddr(r *http.Request) string {
 	v := r.Header.Get(xForwardedFor)