feat: support form array in three notations (#4498)

Signed-off-by: kevin <wanjunfeng@gmail.com>

rest/httpx/util_test.go

@@ -1,7 +1,9 @@
 package httpx
 
 import (
+	"fmt"
 	"net/http"
+	"net/url"
 	"strings"
 	"testing"
 
@@ -23,3 +25,23 @@ func TestGetRemoteAddrNoHeader(t *testing.T) {
 
 	assert.True(t, len(GetRemoteAddr(r)) == 0)
 }
+
+func TestGetFormValues_TooManyValues(t *testing.T) {
+	form := url.Values{}
+
+	// Add more values than the limit
+	for i := 0; i < maxFormParamCount+10; i++ {
+		form.Add("param", fmt.Sprintf("value%d", i))
+	}
+
+	// Create a new request with the form data
+	req, err := http.NewRequest("POST", "/test", strings.NewReader(form.Encode()))
+	assert.NoError(t, err)
+
+	// Set the content type for form data
+	req.Header.Set(ContentType, "application/x-www-form-urlencoded")
+
+	_, err = GetFormValues(req)
+	assert.Error(t, err)
+	assert.Contains(t, err.Error(), "too many form values")
+}