diff --git a/td/generate/scheme/telegram_api.tl b/td/generate/scheme/telegram_api.tl
index 178a59ca..1e9a8123 100644
--- a/td/generate/scheme/telegram_api.tl
+++ b/td/generate/scheme/telegram_api.tl
@@ -833,6 +833,11 @@ messages.foundStickerSets#5108d648 hash:int sets:Vector<StickerSetCovered> = mes
 
 fileHash#6242c773 offset:int limit:int hash:bytes = FileHash;
 
+inputClientProxy#75588b3f address:string port:int = InputClientProxy;
+
+help.proxyDataEmpty#e09e1fb8 expires:int = help.ProxyData;
+help.proxyDataPromo#2bf7ee23 expires:int peer:Peer chats:Vector<Chat> users:Vector<User> = help.ProxyData;
+
 inputSecureFileUploaded#3334b0f0 id:long parts:int md5_checksum:string file_hash:bytes secret:bytes = InputSecureFile;
 inputSecureFile#5367e5be id:long access_hash:long = InputSecureFile;
 
@@ -884,7 +889,7 @@ help.deepLinkInfo#6a4ee832 flags:# update_app:flags.0?true message:string entiti
 
 invokeAfterMsg#cb9f372d {X:Type} msg_id:long query:!X = X;
 invokeAfterMsgs#3dc4b4f0 {X:Type} msg_ids:Vector<long> query:!X = X;
-initConnection#c7481da6 {X:Type} api_id:int device_model:string system_version:string app_version:string system_lang_code:string lang_pack:string lang_code:string query:!X = X;
+initConnection#785188b8 {X:Type} flags:# api_id:int device_model:string system_version:string app_version:string system_lang_code:string lang_pack:string lang_code:string proxy:flags.0?InputClientProxy query:!X = X;
 invokeWithLayer#da9b0d0d {X:Type} layer:int query:!X = X;
 invokeWithoutUpdates#bf9459b7 {X:Type} query:!X = X;
 
@@ -1092,6 +1097,7 @@ help.getTermsOfService#350170f3 = help.TermsOfService;
 help.setBotUpdatesStatus#ec22cfcd pending_updates_count:int message:string = Bool;
 help.getCdnConfig#52029342 = CdnConfig;
 help.getRecentMeUrls#3dc0f114 referer:string = help.RecentMeUrls;
+help.getProxyData#3d7758e1 = help.ProxyData;
 help.getDeepLinkInfo#3fedc75f path:string = help.DeepLinkInfo;
 
 channels.readHistory#cc104937 channel:InputChannel max_id:int = Bool;
diff --git a/td/generate/scheme/telegram_api.tlo b/td/generate/scheme/telegram_api.tlo
index 9ee1d704..f5b7081c 100644
Binary files a/td/generate/scheme/telegram_api.tlo and b/td/generate/scheme/telegram_api.tlo differ
diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index 7a4e8941..f52ee237 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -4942,6 +4942,7 @@ Status Td::set_parameters(td_api::object_ptr<td_api::tdlibParameters> parameters
     options.application_version += ", TDLib ";
     options.application_version += TDLIB_VERSION;
   }
+  options.proxy = Proxy();
   G()->set_mtproto_header(std::make_unique<MtprotoHeader>(options));
 
   state_ = State::Decrypt;
diff --git a/td/telegram/net/MtprotoHeader.cpp b/td/telegram/net/MtprotoHeader.cpp
index c3fc3d32..12d81815 100644
--- a/td/telegram/net/MtprotoHeader.cpp
+++ b/td/telegram/net/MtprotoHeader.cpp
@@ -24,9 +24,16 @@ class HeaderStorer {
     // invokeWithLayer#da9b0d0d {X:Type} layer:int query:!X = X;
     store(static_cast<int32>(0xda9b0d0d), storer);
     store(LAYER, storer);
-    // initConnection#c7481da6 {X:Type} api_id:int device_model:string system_version:string app_version:string
-    // system_lang_code:string lang_pack:string lang_code:string query:!X = X;
-    store(static_cast<int32>(0xc7481da6), storer);
+    // initConnection#785188b8 {X:Type} flags:# api_id:int device_model:string system_version:string app_version:string
+    // system_lang_code:string lang_pack:string lang_code:string proxy:flags.0?InputClientProxy query:!X = X;
+    store(static_cast<int32>(0x785188b8), storer);
+    int32 flags = 0;
+    /*
+    if (!is_anonymous && proxy.type() == Proxy::Type::Mtproto) {
+      flags |= 1 << 0;
+    }
+    */
+    store(flags, storer);
     store(options.api_id, storer);
     if (is_anonymous) {
       store(Slice("n/a"), storer);
@@ -39,6 +46,9 @@ class HeaderStorer {
     store(options.system_language_code, storer);
     store(string(), storer);
     store(string(), storer);
+    if ((flags & 1) != 0) {
+      // TODO
+    }
   }
 
  private:
diff --git a/td/telegram/net/MtprotoHeader.h b/td/telegram/net/MtprotoHeader.h
index cacd41ca..be546cd3 100644
--- a/td/telegram/net/MtprotoHeader.h
+++ b/td/telegram/net/MtprotoHeader.h
@@ -6,6 +6,8 @@
 //
 #pragma once
 
+#include "td/telegram/net/ConnectionCreator.h"
+
 #include "td/utils/common.h"
 #include "td/utils/Slice.h"
 
@@ -19,6 +21,7 @@ class MtprotoHeader {
     string device_model;
     string system_version;
     string application_version;
+    Proxy proxy;
   };
 
   explicit MtprotoHeader(const Options &options)