--- a/src/event/quic/ngx_event_quic_streams.c
+++ b/src/event/quic/ngx_event_quic_streams.c
@@ -887,7 +887,7 @@ ngx_quic_stream_send_chain(ngx_connectio
 
     qs->send_state = NGX_QUIC_STREAM_SEND_SEND;
 
-    flow = qs->acked + qc->conf->stream_buffer_size - c->sent;
+    flow = qs->acked + qc->conf->stream_buffer_size - qs->sent;
 
     if (flow == 0) {
         wev->ready = 0;
@@ -900,13 +900,14 @@ ngx_quic_stream_send_chain(ngx_connectio
 
     n = qs->send.size;
 
-    in = ngx_quic_write_buffer(pc, &qs->send, in, limit, c->sent);
+    in = ngx_quic_write_buffer(pc, &qs->send, in, limit, qs->sent);
     if (in == NGX_CHAIN_ERROR) {
         return NGX_CHAIN_ERROR;
     }
 
     n = qs->send.size - n;
     c->sent += n;
+    qs->sent += n;
     qc->streams.sent += n;
 
     if (flow == n) {
@@ -1045,9 +1046,12 @@ ngx_quic_close_stream(ngx_quic_stream_t 
     if (!qc->closing) {
         /* make sure everything is sent and final size is received */
 
-        if (qs->recv_state == NGX_QUIC_STREAM_RECV_RECV
-            || qs->send_state == NGX_QUIC_STREAM_SEND_READY
-            || qs->send_state == NGX_QUIC_STREAM_SEND_SEND)
+        if (qs->recv_state == NGX_QUIC_STREAM_RECV_RECV) {
+            return NGX_OK;
+        }
+
+        if (qs->send_state != NGX_QUIC_STREAM_SEND_DATA_RECVD
+            && qs->send_state != NGX_QUIC_STREAM_SEND_RESET_RECVD)
         {
             return NGX_OK;
         }
@@ -1488,36 +1492,70 @@ ngx_quic_handle_max_streams_frame(ngx_co
 void
 ngx_quic_handle_stream_ack(ngx_connection_t *c, ngx_quic_frame_t *f)
 {
-    uint64_t                sent, unacked;
+    uint64_t                acked;
     ngx_quic_stream_t      *qs;
     ngx_quic_connection_t  *qc;
 
     qc = ngx_quic_get_connection(c);
 
-    qs = ngx_quic_find_stream(&qc->streams.tree, f->u.stream.stream_id);
-    if (qs == NULL) {
+    switch (f->type) {
+
+    case NGX_QUIC_FT_RESET_STREAM:
+
+        qs = ngx_quic_find_stream(&qc->streams.tree, f->u.reset_stream.id);
+        if (qs == NULL) {
+            return;
+        }
+
+        qs->send_state = NGX_QUIC_STREAM_SEND_RESET_RECVD;
+
+        ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
+                       "quic stream id:0x%xL ack reset final_size:%uL",
+                       qs->id, f->u.reset_stream.final_size);
+
+        break;
+
+    case NGX_QUIC_FT_STREAM:
+
+        qs = ngx_quic_find_stream(&qc->streams.tree, f->u.stream.stream_id);
+        if (qs == NULL) {
+            return;
+        }
+
+        acked = qs->acked;
+        qs->acked += f->u.stream.length;
+
+        if (f->u.stream.fin) {
+            qs->fin_acked = 1;
+        }
+
+        if (qs->send_state == NGX_QUIC_STREAM_SEND_DATA_SENT
+            && qs->acked == qs->sent && qs->fin_acked)
+        {
+            qs->send_state = NGX_QUIC_STREAM_SEND_DATA_RECVD;
+        }
+
+        ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
+                       "quic stream id:0x%xL ack len:%uL fin:%d unacked:%uL",
+                       qs->id, f->u.stream.length, f->u.stream.fin,
+                       qs->sent - qs->acked);
+
+        if (qs->connection
+            && qs->sent - acked == qc->conf->stream_buffer_size
+            && f->u.stream.length > 0)
+        {
+            ngx_quic_set_event(qs->connection->write);
+        }
+
+        break;
+
+    default:
         return;
     }
 
     if (qs->connection == NULL) {
-        qs->acked += f->u.stream.length;
-        return;
+        ngx_quic_close_stream(qs);
     }
-
-    sent = qs->connection->sent;
-    unacked = sent - qs->acked;
-    qs->acked += f->u.stream.length;
-
-    ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
-                   "quic stream id:0x%xL ack len:%uL acked:%uL unacked:%uL",
-                   qs->id, f->u.stream.length, qs->acked, sent - qs->acked);
-
-    if (unacked != qc->conf->stream_buffer_size) {
-        /* not blocked on buffer size */
-        return;
-    }
-
-    ngx_quic_set_event(qs->connection->write);
 }