Update.

Author: xOS

.gitignore

@@ -9,3 +9,4 @@
 **/*/.DS_Store
 data
 complete-hybrid.json
+czdb-only.json

http/cache.go

@@ -39,11 +39,24 @@ func key(ip net.IP) uint64 {
 	return h.Sum64()
 }
 
+func keyWithLang(ip net.IP, lang string) uint64 {
+	h := fnv.New64a()
+	h.Write(ip)
+	if lang != "" {
+		h.Write([]byte(lang))
+	}
+	return h.Sum64()
+}
+
 func (c *Cache) Set(ip net.IP, resp Response) {
+	c.SetWithLang(ip, "", resp)
+}
+
+func (c *Cache) SetWithLang(ip net.IP, lang string, resp Response) {
 	if c.capacity == 0 {
 		return
 	}
-	k := key(ip)
+	k := keyWithLang(ip, lang)
 	c.mu.Lock()
 	defer c.mu.Unlock()
 	minEvictions := len(c.entries) - c.capacity + 1
@@ -67,7 +80,11 @@ func (c *Cache) Set(ip net.IP, resp Response) {
 }
 
 func (c *Cache) Get(ip net.IP) (Response, bool) {
-	k := key(ip)
+	return c.GetWithLang(ip, "")
+}
+
+func (c *Cache) GetWithLang(ip net.IP, lang string) (Response, bool) {
+	k := keyWithLang(ip, lang)
 	c.mu.RLock()
 	defer c.mu.RUnlock()
 	r, ok := c.entries[k]

http/cache_test.go

@@ -85,3 +85,40 @@ func TestCacheResize(t *testing.T) {
 		t.Errorf("want %d entries, got %d", want, got)
 	}
 }
+
+func TestCacheWithLang(t *testing.T) {
+	c := NewCache(10)
+	ip := net.ParseIP("192.0.2.1")
+
+	// Test different lang parameters create different cache entries
+	responseZh := Response{IP: ip, Country: "中国"}
+	responseEn := Response{IP: ip, Country: "China"}
+	responseDefault := Response{IP: ip, Country: "Default"}
+
+	c.SetWithLang(ip, "zh", responseZh)
+	c.SetWithLang(ip, "en", responseEn)
+	c.SetWithLang(ip, "", responseDefault)
+
+	// Should have 3 different cache entries
+	if got, want := len(c.entries), 3; got != want {
+		t.Errorf("want %d entries, got %d", want, got)
+	}
+
+	// Test retrieval
+	if resp, ok := c.GetWithLang(ip, "zh"); !ok || resp.Country != "中国" {
+		t.Errorf("GetWithLang(ip, 'zh') = (%v, %t), want (Response{Country: '中国'}, true)", resp, ok)
+	}
+
+	if resp, ok := c.GetWithLang(ip, "en"); !ok || resp.Country != "China" {
+		t.Errorf("GetWithLang(ip, 'en') = (%v, %t), want (Response{Country: 'China'}, true)", resp, ok)
+	}
+
+	if resp, ok := c.GetWithLang(ip, ""); !ok || resp.Country != "Default" {
+		t.Errorf("GetWithLang(ip, '') = (%v, %t), want (Response{Country: 'Default'}, true)", resp, ok)
+	}
+
+	// Test backward compatibility
+	if resp, ok := c.Get(ip); !ok || resp.Country != "Default" {
+		t.Errorf("Get(ip) = (%v, %t), want (Response{Country: 'Default'}, true)", resp, ok)
+	}
+}