add x-region header

internal/upstream/client.go

@@ -237,12 +237,14 @@ func MakeUpstreamRequest(token string, messages []model.Message, modelName strin
 
 	req.Header.Set("Authorization", "Bearer "+token)
 	req.Header.Set("X-FE-Version", version.GetFeVersion())
+	req.Header.Set("X-Region", "overseas")
 	req.Header.Set("X-Signature", signature)
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Connection", "keep-alive")
 	req.Header.Set("Origin", "https://chat.z.ai")
 	req.Header.Set("Referer", fmt.Sprintf("https://chat.z.ai/c/%s", uuid.New().String()))
 	req.Header.Set("User-Agent", uarand.GetRandom())
+	
 
 	client := proxy.GetHTTPClient()
 	resp, err := client.Do(req)