diff --git a/src/http/modules/ngx_http_grpc_module.c b/src/http/modules/ngx_http_grpc_module.c
index 7fbf736..3a9b950 100644
--- a/src/http/modules/ngx_http_grpc_module.c
+++ b/src/http/modules/ngx_http_grpc_module.c
@@ -111,6 +111,7 @@
     unsigned                   output_closed:1;
     unsigned                   parsing_headers:1;
     unsigned                   end_stream:1;
+    unsigned                   done:1;
     unsigned                   status:1;
 
     ngx_http_request_t        *request;
@@ -1074,6 +1075,7 @@
     ctx->output_closed = 0;
     ctx->parsing_headers = 0;
     ctx->end_stream = 0;
+    ctx->done = 0;
     ctx->status = 0;
     ctx->connection = NULL;
 
@@ -1093,6 +1095,7 @@
     ngx_int_t               rc;
     ngx_uint_t              next, last;
     ngx_chain_t            *cl, *out, **ll;
+    ngx_http_upstream_t    *u;
     ngx_http_grpc_ctx_t    *ctx;
     ngx_http_grpc_frame_t  *f;
 
@@ -1407,6 +1410,28 @@
         rc = NGX_AGAIN;
     }
 
+    if (ctx->done) {
+
+        /*
+         * We have already got the response and were sending some additional
+         * control frames.  Even if there is still something unsent, stop
+         * here anyway.
+         */
+
+        u = r->upstream;
+        u->length = 0;
+
+        if (ctx->in == NULL
+            && ctx->out == NULL
+            && ctx->output_closed
+            && ctx->state == ngx_http_grpc_st_start)
+        {
+            u->keepalive = 1;
+        }
+
+        ngx_post_event(u->peer.connection->read, &ngx_posted_events);
+    }
+
     return rc;
 }
 
@@ -1832,6 +1857,33 @@
             rc = ngx_http_grpc_parse_frame(r, ctx, b);
 
             if (rc == NGX_AGAIN) {
+
+                if (ctx->done) {
+
+                    /*
+                     * We have finished parsing the response and the
+                     * remaining control frames.  If there are unsent
+                     * control frames, post a write event to send them.
+                     */
+
+                    if (ctx->out) {
+                        ngx_post_event(u->peer.connection->write,
+                                       &ngx_posted_events);
+                        return NGX_AGAIN;
+                    }
+
+                    u->length = 0;
+
+                    if (ctx->in == NULL
+                        && ctx->output_closed
+                        && ctx->state == ngx_http_grpc_st_start)
+                    {
+                        u->keepalive = 1;
+                    }
+
+                    break;
+                }
+
                 return NGX_AGAIN;
             }
 
@@ -1898,6 +1950,13 @@
                 return NGX_ERROR;
             }
 
+            if (ctx->stream_id && ctx->done) {
+                ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                              "upstream sent frame for closed stream %ui",
+                              ctx->stream_id);
+                return NGX_ERROR;
+            }
+
             ctx->padding = 0;
         }
 
@@ -1914,17 +1973,7 @@
             ctx->state = ngx_http_grpc_st_start;
 
             if (ctx->flags & NGX_HTTP_V2_END_STREAM_FLAG) {
-                u->length = 0;
-
-                if (ctx->in == NULL
-                    && ctx->out == NULL
-                    && ctx->output_closed
-                    && b->last == b->pos)
-                {
-                    u->keepalive = 1;
-                }
-
-                break;
+                ctx->done = 1;
             }
 
             continue;
@@ -2094,17 +2143,8 @@
                                    "grpc trailer done");
 
                     if (ctx->end_stream) {
-                        u->length = 0;
-
-                        if (ctx->in == NULL
-                            && ctx->out == NULL
-                            && ctx->output_closed
-                            && b->last == b->pos)
-                        {
-                            u->keepalive = 1;
-                        }
-
-                        return NGX_OK;
+                        ctx->done = 1;
+                        break;
                     }
 
                     ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
@@ -2121,6 +2161,10 @@
                 return NGX_ERROR;
             }
 
+            if (rc == NGX_HTTP_PARSE_HEADER_DONE) {
+                continue;
+            }
+
             /* rc == NGX_AGAIN */
 
             if (ctx->rest == 0) {
@@ -2237,17 +2281,7 @@
         ctx->state = ngx_http_grpc_st_start;
 
         if (ctx->flags & NGX_HTTP_V2_END_STREAM_FLAG) {
-            u->length = 0;
-
-            if (ctx->in == NULL
-                && ctx->out == NULL
-                && ctx->output_closed
-                && b->last == b->pos)
-            {
-                u->keepalive = 1;
-            }
-
-            break;
+            ctx->done = 1;
         }
     }