diff --git a/web/documentserver-example/csharp-mvc/Scripts/jscript.js b/web/documentserver-example/csharp-mvc/Scripts/jscript.js
index 520095a03..3adcd21f4 100644
--- a/web/documentserver-example/csharp-mvc/Scripts/jscript.js
+++ b/web/documentserver-example/csharp-mvc/Scripts/jscript.js
@@ -109,7 +109,7 @@ if (typeof jQuery != "undefined") {
     
     var timer = null;
     var checkConvert = function (filePass, fileType) {
-	    filePass = filePass ? filePass : null;
+        filePass = filePass ? filePass : null;
         if (timer != null) {
             clearTimeout(timer);
         }
diff --git a/web/documentserver-example/csharp/Forgotten.aspx.cs b/web/documentserver-example/csharp/Forgotten.aspx.cs
index 43249e422..96b9a77b1 100755
--- a/web/documentserver-example/csharp/Forgotten.aspx.cs
+++ b/web/documentserver-example/csharp/Forgotten.aspx.cs
@@ -46,6 +46,7 @@ public static string DocumentType(string fileName)
         {
             var ext = Path.GetExtension(fileName).ToLower();
 
+            if (FormatManager.PdfExtensions().Contains(ext)) return "pdf";  // pdf for pdf extensions
             if (FormatManager.DocumentExtensions().Contains(ext)) return "word";  // word for text document extensions
             if (FormatManager.SpreadsheetExtensions().Contains(ext)) return "cell";  // cell for spreadsheet extensions
             if (FormatManager.PresentationExtensions().Contains(ext)) return "slide";  // slide for presentation extensions
diff --git a/web/documentserver-example/csharp/script/jscript.js b/web/documentserver-example/csharp/script/jscript.js
index 5e9051c3c..4f8324837 100644
--- a/web/documentserver-example/csharp/script/jscript.js
+++ b/web/documentserver-example/csharp/script/jscript.js
@@ -109,7 +109,7 @@ if (typeof jQuery != "undefined") {
 
     var timer = null;
     var checkConvert = function (filePass, fileType) {
-		filePass = filePass ? filePass : null;
+        filePass = filePass ? filePass : null;
         if (timer != null) {
             clearTimeout(timer);
         }
diff --git a/web/documentserver-example/java-spring/pom.xml b/web/documentserver-example/java-spring/pom.xml
index cce34e2e3..eb02f794a 100644
--- a/web/documentserver-example/java-spring/pom.xml
+++ b/web/documentserver-example/java-spring/pom.xml
@@ -84,7 +84,7 @@
 		<dependency>
 			<groupId>com.onlyoffice</groupId>
 			<artifactId>docs-integration-sdk</artifactId>
-			<version>1.1.4-SNAPSHOT</version>
+			<version>1.2.1-SNAPSHOT</version>
 		</dependency>
 	</dependencies>
 
diff --git a/web/documentserver-example/java/src/main/java/helpers/Users.java b/web/documentserver-example/java/src/main/java/helpers/Users.java
index 2cb7ad389..20a038566 100755
--- a/web/documentserver-example/java/src/main/java/helpers/Users.java
+++ b/web/documentserver-example/java/src/main/java/helpers/Users.java
@@ -93,7 +93,7 @@ public final class Users {
                 "group-2", Arrays.asList("group-2", ""), new CommentGroups(null,
                 Arrays.asList("group-2", ""), Arrays.asList("group-2")), Arrays.asList("group-2", ""),
                 true, new ArrayList<String>(), descriptionUserSecond, false, true,
-                new Goback("Go to Documents", null)));
+                new Goback("Go to Documents", false)));
         add(new User("uid-3", "Hamish Mitchell", null,
                 "group-3", Arrays.asList("group-2"), new CommentGroups(Arrays.asList("group-3", "group-2"),
                 Arrays.asList("group-2"), null), Arrays.asList("group-2"),
diff --git a/web/documentserver-example/php/src/ajax.php b/web/documentserver-example/php/src/ajax.php
index 16d45fc60..71b6d829d 100644
--- a/web/documentserver-example/php/src/ajax.php
+++ b/web/documentserver-example/php/src/ajax.php
@@ -61,7 +61,7 @@ function saveas()
         $formatManager = new FormatManager();
 
         $post = json_decode(file_get_contents('php://input'), true);
-        $fileurl = $post["url"];
+        $fileurl = str_replace("//localhost", "//proxy", $post["url"]);
         $title = $post["title"];
         $extension = mb_strtolower(pathinfo($title, PATHINFO_EXTENSION));
         $allexts = $formatManager->allExtensions();
diff --git a/web/documentserver-example/python/src/utils/trackManager.py b/web/documentserver-example/python/src/utils/trackManager.py
index 234edc822..a2d4c7dd3 100755
--- a/web/documentserver-example/python/src/utils/trackManager.py
+++ b/web/documentserver-example/python/src/utils/trackManager.py
@@ -203,7 +203,7 @@ def commandRequest(method, key, meta=None):
                              verify=config_manager.ssl_verify_peer_mode_enabled(), timeout=5)
 
     error = response.json()["error"]
-    if not error == 0:
+    if error not in (4, 0):
         raise Exception(f"Command Service Error #{error}")
 
     return response
diff --git a/web/documentserver-example/ruby/app/models/track_helper.rb b/web/documentserver-example/ruby/app/models/track_helper.rb
index 93b125b4d..569e370ad 100755
--- a/web/documentserver-example/ruby/app/models/track_helper.rb
+++ b/web/documentserver-example/ruby/app/models/track_helper.rb
@@ -314,7 +314,7 @@ def self.command_request(method, key, meta = nil)
       res = http.request(req) # get the response
       data = res.body # and take its body
       result = JSON.parse(data) # convert the response body into the json format
-      raise("Command service error: #{result['error']}") if result['error'] != 0
+      raise("Command service error: #{result['error']}") if [4, 0].exclude?(result['error'])
     rescue StandardError => e
       raise(e.message)
     end