diff --git a/STranslateDLL/LocalMode.cs b/STranslateDLL/LocalMode.cs
index 81259c3..58ee34d 100644
--- a/STranslateDLL/LocalMode.cs
+++ b/STranslateDLL/LocalMode.cs
@@ -1,7 +1,9 @@
 using System.IO.Compression;
+using System.Net;
 using System.Text;
 using System.Text.Encodings.Web;
 using System.Text.Json;
+using System.Text.Json.Nodes;
 using System.Text.Json.Serialization;
 
 namespace STranslateDLL;
@@ -10,7 +12,20 @@ public static class LocalMode
 {
     private static long _nextId;
 
-    private static bool _hasInit = false;
+    private static bool _hasInit;
+
+    private static readonly Dictionary<bool, string> TextTypeDic = new()
+    {
+        { true, "richtext" },
+        { false, "plaintext" }
+    };
+
+    private static JsonSerializerOptions GetOptions =>
+        new()
+        {
+            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
+            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingDefault
+        };
 
     private static void Initial()
     {
@@ -23,39 +38,122 @@ public static class LocalMode
 
     public static async Task<string> ExecuteAsync(
         string content,
-        string? sourceLang = null,
+        string sourceLang = "auto",
         string targetLang = "ZH",
         CancellationToken? token = null
     )
     {
-        if (!_hasInit)
+        if (!_hasInit) Initial();
+        var getToken = token ?? CancellationToken.None;
+        var splitResult = await SplitTextAsync(content, getToken);
+        //TODO: Error handling
+
+        var splitObj = JsonSerializer.Deserialize<JsonObject>(splitResult);
+        if (sourceLang.Equals("auto", StringComparison.CurrentCultureIgnoreCase) || sourceLang.Equals(""))
         {
-            Initial();
+            sourceLang = splitObj?["result"]?["lang"]?["detected"]?.ToString()?.ToUpper() ?? "auto";
         }
-        var getToken = token ?? CancellationToken.None;
-        var timeSpan = GenerateTimestamp(content);
+
+        var jobs = new List<Job>();
+        var chunks = splitObj?["result"]?["texts"]?[0]?["chunks"];
+        if (chunks is JsonArray chunkArray)
+        {
+            for (var i = 0; i < chunkArray.Count; i++)
+            {
+                var sentence = chunkArray[i]?["sentences"]?[0];
+                var contextBefore = Array.Empty<string>();
+                var contextAfter = Array.Empty<string>();
+                if (i > 0)
+                {
+                    contextBefore = [chunkArray[i - 1]?["sentences"]?[0]?["text"]?.ToString() ?? ""];
+                }
+
+                if (i < chunkArray.Count - 1)
+                {
+                    contextAfter = [chunkArray[i + 1]?["sentences"]?[0]?["text"]?.ToString() ?? ""];
+                }
+
+                var job = new Job
+                {
+                    Kind = "default",
+                    PreferredNumBeams = 4,
+                    RawEnContextBefore = contextBefore,
+                    RawEnContextAfter = contextAfter,
+                    Sentences =
+                    [
+                        new Sentence
+                        {
+                            Prefix = sentence?["prefix"]?.ToString() ?? "",
+                            Text = sentence?["text"]?.ToString() ?? "",
+                            Id = i + 1,
+                        }
+                    ]
+                };
+                jobs.Add(job);
+            }
+        }
+
+        var hasRegionalVariant = false;
+        var targetLangCode = targetLang;
+        var targetLangParts = targetLang.Split("-");
+        if (targetLangParts.Length > 1)
+        {
+            targetLangCode = targetLangParts[0];
+            hasRegionalVariant = true;
+        }
+
         var id = CreateId();
-        var reqStr = GenerateRequestStr(content, sourceLang, targetLang, timeSpan, id);
+        var reqData = new DeepLRequest
+        {
+            Jsonrpc = "2.0",
+            Method = "LMT_handle_jobs",
+            Id = id,
+            Params = new ReqParams
+            {
+                CommonJobParams = new ReqParamsCommonJobParams
+                {
+                    Mode = "translate",
+                    RegionalVariant = hasRegionalVariant ? targetLang : null
+                },
+                Lang = new ReqParamsLang
+                {
+                    // SourceLangUserSelected = sourceLang,
+                    SourceLangComputed = sourceLang.ToUpper(),
+                    TargetLang = targetLangCode.ToUpper()
+                },
+                Jobs = jobs.ToArray(),
+                Priority = 1,
+                Timestamp = GenerateTimestamp(content)
+            }
+        };
+
+        var json = JsonSerializer.Serialize(reqData, GetOptions);
+        json = AdjustJsonContent(json, id);
+
 
         using var client = new HttpClient();
-        var request = new HttpRequestMessage(HttpMethod.Post, "https://www2.deepl.com/jsonrpc")
+        var request = new HttpRequestMessage(HttpMethod.Post,
+            "https://www2.deepl.com/jsonrpc?client=chrome-extension,1.28.0&method=LMT_handle_jobs")
         {
-            Content = new StringContent(reqStr, Encoding.UTF8, "application/json")
+            Content = new StringContent(json, Encoding.UTF8, "application/json")
         };
 
-        // Add headers to the request
-        request.Headers.Add("User-Agent", "DeepL-iOS/2.4.0 iOS 15.7.1 (iPhone14,2)");
         request.Headers.Add("Accept", "*/*");
-        request.Headers.Add("x-app-os-name", "IOS");
-        request.Headers.Add("x-app-os-version", "15.7.1");
-        request.Headers.Add("Accept-Language", "en-US,en;q=0.9");
-        request.Headers.Add("Accept-Encoding", "gzip,deflate,br");
-        //request.Headers.Add("Content-Type", "application/json");
-        request.Headers.Add("x-app-device", "iPhone14,2");
-        request.Headers.Add("x-app-build", "353");
-        request.Headers.Add("x-app-version", "2.4");
+        request.Headers.Add("Accept-Language", "en-US,en;q=0.9,zh-CN;q=0.8,zh-TW;q=0.7,zh-HK;q=0.6,zh;q=0.5");
+        request.Headers.Add("Authorization", "None");
+        request.Headers.Add("Cache-Control", "no-cache");
+        // request.Headers.Add("Content-Type", "application/json");
+        request.Headers.Add("DNT", "1");
+        request.Headers.Add("Origin", "chrome-extension://cofdbpoegempjloogbagkncekinflcnj");
+        request.Headers.Add("Pragma", "no-cache");
+        request.Headers.Add("Priority", "u=1, i");
         request.Headers.Add("Referer", "https://www.deepl.com/");
-        request.Headers.Add("Connection", "keep-alive");
+        request.Headers.Add("Sec-Fetch-Dest", "empty");
+        request.Headers.Add("Sec-Fetch-Mode", "cors");
+        request.Headers.Add("Sec-Fetch-Site", "none");
+        request.Headers.Add("Sec-GPC", "1");
+        request.Headers.Add("User-Agent",
+            "DeepLBrowserExtension/1.28.0 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36");
 
         var resp = await client.SendAsync(request, getToken);
         //resp.EnsureSuccessStatusCode();
@@ -76,28 +174,124 @@ public static class LocalMode
         {
             responseBody = await resp.Content.ReadAsStringAsync(getToken);
         }
+        
+        var jNode = JsonNode.Parse(responseBody);
+        var data = jNode?["result"]?["translations"]?[0]?["beams"]?[0]?["sentences"]?[0]?["text"]?.ToString();
+        // data = UnicodeToString(data);
 
-        var deeplResp = JsonSerializer.Deserialize<DeepLResponse>(responseBody);
+        var errorMsg = jNode?["error"]?["message"]?.ToString();
+        var detailsMsg = jNode?["error"]?["data"]?["what"]?.ToString();
+        var error = $"Error: {errorMsg}\nDetails: {detailsMsg}";
 
-        var response = new Response { Code = resp.StatusCode.GetHashCode() };
-
-        string defaultMessage =
-            resp.StatusCode == System.Net.HttpStatusCode.OK
-                ? "Empty Result"
-                : "Empty Error Message";
-        response.Data =
-            deeplResp?.Result?.Texts?.FirstOrDefault()?.Text
-            ?? deeplResp?.Error?.Message
-            ?? defaultMessage;
+        var response = new Response
+        {
+            Code = resp.StatusCode.GetHashCode(),
+            Data = data ?? error
+        };
 
         return JsonSerializer.Serialize(response, GetOptions);
     }
 
+    private static async Task<string> SplitTextAsync(string text, CancellationToken? token)
+    {
+        var id = CreateId();
+        var getToken = token ?? CancellationToken.None;
+        var requestData = new DeepLRequest
+        {
+            Jsonrpc = "2.0",
+            Method = "LMT_split_text",
+            Id = id,
+            Params = new ReqParams
+            {
+                CommonJobParams = new ReqParamsCommonJobParams
+                {
+                    Mode = "translate"
+                },
+                Lang = new ReqParamsLang
+                {
+                    SourceLangUserSelected = "auto"
+                },
+                Texts = [text],
+                TextType = TextTypeDic[ /*tagHandling*/false || IsRichText(text)]
+            }
+        };
+
+        var json = JsonSerializer.Serialize(requestData, GetOptions);
+        json = AdjustJsonContent(json, id);
+        using var client = new HttpClient();
+        var request = new HttpRequestMessage(HttpMethod.Post,
+            "https://www2.deepl.com/jsonrpc?client=chrome-extension,1.28.0&method=LMT_split_text")
+        {
+            Content = new StringContent(json, Encoding.UTF8, "application/json")
+        };
+        // Add headers to the request
+        request.Headers.Add("Accept", "*/*");
+        request.Headers.Add("Accept-Language", "en-US,en;q=0.9,zh-CN;q=0.8,zh-TW;q=0.7,zh-HK;q=0.6,zh;q=0.5");
+        request.Headers.Add("Authorization", "None");
+        request.Headers.Add("Cache-Control", "no-cache");
+        // request.Headers.Add("Content-Type", "application/json");
+        request.Headers.Add("DNT", "1");
+        request.Headers.Add("Origin", "chrome-extension://cofdbpoegempjloogbagkncekinflcnj");
+        request.Headers.Add("Pragma", "no-cache");
+        request.Headers.Add("Priority", "u=1, i");
+        request.Headers.Add("Referer", "https://www.deepl.com/");
+        request.Headers.Add("Sec-Fetch-Dest", "empty");
+        request.Headers.Add("Sec-Fetch-Mode", "cors");
+        request.Headers.Add("Sec-Fetch-Site", "none");
+        request.Headers.Add("Sec-GPC", "1");
+        request.Headers.Add("User-Agent",
+            "DeepLBrowserExtension/1.28.0 Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36");
+
+        var resp = await client.SendAsync(request, getToken);
+        string responseBody;
+
+        if (resp.Content.Headers.ContentEncoding.Contains("br"))
+        {
+            await using var responseStream = await resp.Content.ReadAsStreamAsync(getToken);
+            await using var decompressionStream = new BrotliStream(
+                responseStream,
+                CompressionMode.Decompress
+            );
+            using var streamReader = new StreamReader(decompressionStream);
+            responseBody = await streamReader.ReadToEndAsync(getToken);
+        }
+        else
+        {
+            responseBody = await resp.Content.ReadAsStringAsync(getToken);
+        }
+
+        return responseBody;
+    }
+    
+    private static string? UnicodeToString(string? srcText)
+    {
+        if (srcText == null) return default;
+        var dst = "";
+        var src = srcText;
+        var len = srcText.Length / 6;
+        for (var i = 0; i <= len - 1; i++)
+        {
+            var str = "";
+            str = src[..6][2..];
+            src = src[6..];
+            var bytes = new byte[2];
+            bytes[1] = byte.Parse(int.Parse(str[..2], System.Globalization.NumberStyles.HexNumber).ToString());
+            bytes[0] = byte.Parse(int.Parse(str.Substring(2, 2), System.Globalization.NumberStyles.HexNumber).ToString());
+            dst += Encoding.Unicode.GetString(bytes);
+        }
+        return dst;
+    }
+
+    private static bool IsRichText(string text)
+    {
+        return text.Contains('<') && text.Contains('>');
+    }
+
     private static long GenerateTimestamp(string texts)
     {
         long iCount = texts.Split('i').Length - 1;
         var ts = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
-        return iCount != 0 ? ts - ts % (iCount + 1) + (iCount + 1) : ts;
+        return iCount != 0 ? ts - ts % (iCount + 1) + iCount + 1 : ts;
     }
 
     private static long CreateId()
@@ -109,62 +303,11 @@ public static class LocalMode
     {
         string method;
         if ((id + 3) % 13 == 0 || (id + 5) % 29 == 0)
-        {
             method = "\"method\" : \"";
-        }
         else
-        {
             method = "\"method\": \"";
-        }
         return json.Replace("\"method\":\"", method);
     }
-
-    private static JsonSerializerOptions GetOptions =>
-        new()
-        {
-            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
-            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
-        };
-
-    private static string GenerateRequestStr(
-        string text,
-        string? sourceLang,
-        string targetLang,
-        long timeSpan,
-        long id
-    )
-    {
-        var req = new DeepLRequest
-        {
-            Jsonrpc = "2.0",
-            Method = "LMT_handle_texts",
-            Params = new ReqParams
-            {
-                Texts = [new ReqParamsTexts { Text = text, RequestAlternatives = 0 }],
-                Splitting = "newlines",
-                Lang = new ReqParamsLang
-                {
-                    SourceLangUserSelected = sourceLang,
-                    TargetLang = targetLang
-                },
-                Timestamp = timeSpan,
-                CommonJobParams = new ReqParamsCommonJobParams
-                {
-                    WasSpoken = false,
-                    TranscribeAS = ""
-                }
-            },
-            Id = id
-        };
-
-        var json = JsonSerializer.Serialize(req, GetOptions);
-
-        var count = json.Length > 300 ? 0 : 3;
-        req.Params.Texts.First().RequestAlternatives = count;
-        json = JsonSerializer.Serialize(req, GetOptions);
-        json = AdjustJsonContent(json, id);
-        return json;
-    }
 }
 
 public class Response
@@ -173,46 +316,34 @@ public class Response
     public string Data { get; set; } = "";
 }
 
+#region Request
+
 public class DeepLRequest
 {
-    [JsonPropertyName("jsonrpc")]
-    public string Jsonrpc { get; set; } = "";
+    [JsonPropertyName("jsonrpc")] public string Jsonrpc { get; set; } = "";
 
-    [JsonPropertyName("method")]
-    public string Method { get; set; } = "";
+    [JsonPropertyName("method")] public string Method { get; set; } = "";
 
-    [JsonPropertyName("params")]
-    public ReqParams? Params { get; set; }
+    [JsonPropertyName("params")] public ReqParams? Params { get; set; }
 
-    [JsonPropertyName("id")]
-    public long Id { get; set; }
+    [JsonPropertyName("id")] public long Id { get; set; }
 }
 
 public class ReqParams
 {
-    [JsonPropertyName("texts")]
-    public ReqParamsTexts[]? Texts { get; set; }
+    [JsonPropertyName("commonJobParams")] public ReqParamsCommonJobParams? CommonJobParams { get; set; }
 
-    [JsonPropertyName("splitting")]
-    public string Splitting { get; set; } = "";
+    [JsonPropertyName("lang")] public ReqParamsLang? Lang { get; set; }
 
-    [JsonPropertyName("lang")]
-    public ReqParamsLang? Lang { get; set; }
+    [JsonPropertyName("texts")] public string[]? Texts { get; set; }
 
-    [JsonPropertyName("timestamp")]
-    public long Timestamp { get; set; }
+    [JsonPropertyName("textType")] public string? TextType { get; set; }
 
-    [JsonPropertyName("commonJobParams")]
-    public ReqParamsCommonJobParams? CommonJobParams { get; set; }
-}
+    [JsonPropertyName("jobs")] public Job[]? Jobs { get; set; }
 
-public class ReqParamsTexts
-{
-    [JsonPropertyName("text")]
-    public string Text { get; set; } = "";
+    [JsonPropertyName("priority")] public int Priority { get; set; }
 
-    [JsonPropertyName("requestAlternatives")]
-    public int RequestAlternatives { get; set; }
+    [JsonPropertyName("timestamp")] public long Timestamp { get; set; }
 }
 
 public class ReqParamsLang
@@ -220,94 +351,50 @@ public class ReqParamsLang
     [JsonPropertyName("source_lang_user_selected")]
     public string? SourceLangUserSelected { get; set; }
 
-    [JsonPropertyName("target_lang")]
-    public string TargetLang { get; set; } = "";
+    [JsonPropertyName("source_lang_computed")]
+    public string? SourceLangComputed { get; set; }
+
+    [JsonPropertyName("target_lang")] public string TargetLang { get; set; } = "";
 }
 
 public class ReqParamsCommonJobParams
 {
-    [JsonPropertyName("wasSpoken")]
-    public bool WasSpoken { get; set; }
+    [JsonPropertyName("mode")] public string Mode { get; set; } = "";
 
-    [JsonPropertyName("transcribe_as")]
-    public string? TranscribeAS { get; set; }
+    [JsonPropertyName("regionalVariant")] public string? RegionalVariant { get; set; }
 }
 
-public class DeepLResponse
+public class Job
 {
-    [JsonPropertyName("jsonrpc")]
-    public string Jsonrpc { get; set; } = "";
+    [JsonPropertyName("kind")] public string Kind { get; set; } = "";
+
+    [JsonPropertyName("preferred_num_beams")]
+    public int PreferredNumBeams { get; set; }
 
-    [JsonPropertyName("id")]
-    public long Id { get; set; }
+    [JsonPropertyName("raw_en_context_before")]
+    public string[]? RawEnContextBefore { get; set; }
 
-    [JsonPropertyName("result")]
-    public RespResult? Result { get; set; }
+    [JsonPropertyName("raw_en_context_after")]
+    public string[]? RawEnContextAfter { get; set; }
 
-    [JsonPropertyName("error")]
-    public RespError? Error { get; set; }
+    [JsonPropertyName("sentences")] public Sentence[]? Sentences { get; set; }
 }
 
-public class RespResult
+public class Sentence
 {
-    [JsonPropertyName("texts")]
-    public RespResultText[]? Texts { get; set; }
+    [JsonPropertyName("id")] public int Id { get; set; }
 
-    [JsonPropertyName("lang")]
-    public string Lang { get; set; } = "";
+    [JsonPropertyName("prefix")] public string Prefix { get; set; } = "";
 
-    [JsonPropertyName("lang_is_confident")]
-    public bool LangIsConfident { get; set; }
-
-    [JsonPropertyName("detectedLanguages")]
-    public RespResultDetectedLanguages? DetectedLanguages { get; set; }
+    [JsonPropertyName("text")] public string Text { get; set; } = "";
 }
 
-public class RespResultText
-{
-    [JsonPropertyName("alternatives")]
-    public object[]? Alternatives { get; set; }
-
-    [JsonPropertyName("text")]
-    public string Text { get; set; } = "";
-}
+#endregion
 
-public class RespResultDetectedLanguages
-{
-    public float EN { get; set; }
-    public float DE { get; set; }
-    public float FR { get; set; }
-    public float ES { get; set; }
-    public float PT { get; set; }
-    public float IT { get; set; }
-    public float NL { get; set; }
-    public float PL { get; set; }
-    public float RU { get; set; }
-    public float ZH { get; set; }
-    public float JA { get; set; }
-    public float BG { get; set; }
-    public float CS { get; set; }
-    public float DA { get; set; }
-    public float EL { get; set; }
-    public float ET { get; set; }
-    public float FI { get; set; }
-    public float HU { get; set; }
-    public float LT { get; set; }
-    public float LV { get; set; }
-    public float RO { get; set; }
-    public float SK { get; set; }
-    public float SL { get; set; }
-    public float SV { get; set; }
-    public float TR { get; set; }
-    public float ID { get; set; }
-    public float Unsupported { get; set; }
-}
 
 public class RespError
 {
-    [JsonPropertyName("code")]
-    public int Code { get; set; }
+    [JsonPropertyName("code")] public int Code { get; set; }
 
-    [JsonPropertyName("message")]
-    public string Message { get; set; } = "";
-}
+    [JsonPropertyName("message")] public string Message { get; set; } = "";
+}
\ No newline at end of file
diff --git a/STranslateDLLTests/LocalModeTests.cs b/STranslateDLLTests/LocalModeTests.cs
index ef8fb85..3b5a860 100644
--- a/STranslateDLLTests/LocalModeTests.cs
+++ b/STranslateDLLTests/LocalModeTests.cs
@@ -1,9 +1,11 @@
 using System.Diagnostics;
+using STranslateDLL;
 using Xunit;
+using Xunit.Abstractions;
 
-namespace STranslateDLL.Tests;
+namespace STranslateDLLTests;
 
-public class LocalModeTests
+public class LocalModeTests(ITestOutputHelper testOutputHelper)
 {
     [Fact()]
     public async Task ExecuteAsyncTestAsync()
@@ -11,8 +13,8 @@ public class LocalModeTests
         try
         {
             var cts = new CancellationTokenSource();
-            var ret = await LocalMode.ExecuteAsync("Hello World", "auto", "ZH", cts.Token);
-            Debug.WriteLine(ret);
+            var ret = await LocalMode.ExecuteAsync("Hello World", "EN", "ZH", cts.Token);
+            testOutputHelper.WriteLine(ret);
         }
         catch (Exception ex)
         {