diff --git a/oap-stdlib-test/src/test/java/oap/http/server/nio/handlers/KeepaliveRequestsHandlerTest.java b/oap-stdlib-test/src/test/java/oap/http/server/nio/handlers/KeepaliveRequestsHandlerTest.java
index 8155d39efa..d7fb8471d5 100644
--- a/oap-stdlib-test/src/test/java/oap/http/server/nio/handlers/KeepaliveRequestsHandlerTest.java
+++ b/oap-stdlib-test/src/test/java/oap/http/server/nio/handlers/KeepaliveRequestsHandlerTest.java
@@ -38,11 +38,13 @@ public void testCloseConnection() throws IOException {
                 exchange.responseOk( "ok", Http.ContentType.TEXT_PLAIN );
             } );
 
-            for( int i = 0; i < 5; i++ ) {
-                assertThat( Client.DEFAULT.get( "http://localhost:" + testHttpPort + "/test" ).contentString() ).isEqualTo( "ok" );
+            var client = Client.custom().setMaxConnTotal( 10 ).setMaxConnPerRoute( 10 ).build();
+
+            for( int i = 0; i < 101; i++ ) {
+                assertThat( client.get( "http://localhost:" + testHttpPort + "/test" ).contentString() ).isEqualTo( "ok" );
             }
 
-            assertThat( ids ).hasSize( 3 );
+            assertThat( ids ).hasSize( 51 );
             assertThat( keepaliveRequestsHandler.requests ).hasSize( 1 );
         }
     }
diff --git a/oap-stdlib-test/src/test/java/oap/io/IoStreamsTest.java b/oap-stdlib-test/src/test/java/oap/io/IoStreamsTest.java
index e5ba3f6311..16bc8beb2c 100644
--- a/oap-stdlib-test/src/test/java/oap/io/IoStreamsTest.java
+++ b/oap-stdlib-test/src/test/java/oap/io/IoStreamsTest.java
@@ -114,8 +114,7 @@ public void encodingResolve() {
         assertThat( ZSTD.resolve( Paths.get( "/x/a.txt.zst" ) ) ).isEqualTo( Paths.get( "/x/a.txt.zst" ) );
     }
 
-    @Test
-    @SneakyThrows
+    @Test( enabled = false )
     public void compressionLevel() {
         List<List<String>> sets = new ArrayList<>();
         Random random = new Random();
diff --git a/oap-stdlib/src/main/java/oap/http/server/nio/handlers/KeepaliveRequestsHandler.java b/oap-stdlib/src/main/java/oap/http/server/nio/handlers/KeepaliveRequestsHandler.java
index 635cc737c9..a0097aaaac 100644
--- a/oap-stdlib/src/main/java/oap/http/server/nio/handlers/KeepaliveRequestsHandler.java
+++ b/oap-stdlib/src/main/java/oap/http/server/nio/handlers/KeepaliveRequestsHandler.java
@@ -3,6 +3,7 @@
 import io.undertow.server.HttpHandler;
 import io.undertow.server.HttpServerExchange;
 import io.undertow.server.ServerConnection;
+import io.undertow.util.Headers;
 import oap.http.server.nio.AbstractNioHandler;
 
 import java.util.concurrent.ConcurrentHashMap;
@@ -32,6 +33,9 @@ public void handleRequest( HttpServerExchange exchange ) throws Exception {
         long requests = count.incrementAndGet();
 
         try {
+            if( requests >= keepaliveRequests ) {
+                exchange.getResponseHeaders().put( Headers.CONNECTION, "close" );
+            }
             httpHandler.handleRequest( exchange );
         } finally {
             if( requests >= keepaliveRequests ) {
diff --git a/pom.xml b/pom.xml
index d31d66a9dc..f2b3626b66 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,7 +51,7 @@
     </repositories>
 
     <properties>
-        <oap.project.version>21.9.0</oap.project.version>
+        <oap.project.version>21.9.1</oap.project.version>
 
         <oap.deps.config.version>21.0.0</oap.deps.config.version>
         <oap.deps.oap-teamcity.version>21.0.1</oap.deps.oap-teamcity.version>