chore(engine): remove unused lookupHost

context_test.go

@@ -1392,19 +1392,6 @@ func TestContextClientIP(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	c.Request, _ = http.NewRequest("POST", "/", nil)
 
-	c.engine.lookupHost = func(host string) ([]string, error) {
-		if host == "foo" {
-			return []string{"40.40.40.40", "30.30.30.30"}, nil
-		}
-		if host == "bar" {
-			return nil, errors.New("hostname lookup failed")
-		}
-		if host == "baz" {
-			return []string{"thisshouldneverhappen"}, nil
-		}
-		return []string{}, nil
-	}
-
 	resetContextForClientIPTests(c)
 
 	// Legacy tests (validating that the defaults don't break the

gin.go

@@ -106,8 +106,6 @@ type Engine struct {
 	// See the PR #1817 and issue #1644
 	RemoveExtraSlash bool
 
-	lookupHost func(string) ([]string, error)
-
 	delims           render.Delims
 	secureJSONPrefix string
 	HTMLRender       render.HTMLRender
@@ -152,7 +150,6 @@ func New() *Engine {
 		RemoveExtraSlash:       false,
 		UnescapePathValues:     true,
 		MaxMultipartMemory:     defaultMultipartMemory,
-		lookupHost:             net.LookupHost,
 		trees:                  make(methodTrees, 0, 9),
 		delims:                 render.Delims{Left: "{{", Right: "}}"},
 		secureJSONPrefix:       "while(1);",