diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index 2859b5419..ed9a7e8ee 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -2655,6 +2655,14 @@ ngx_http_post_request(ngx_http_request_t *r, ngx_http_posted_request_t *pr)
 {
     ngx_http_posted_request_t  **p;
 
+    for (p = &r->main->posted_requests; *p; p = &(*p)->next) {
+        if ((*p)->request == r) {
+            ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                           "http request already posted");
+            return NGX_OK;
+        }
+    }
+
     if (pr == NULL) {
         pr = ngx_palloc(r->pool, sizeof(ngx_http_posted_request_t));
         if (pr == NULL) {
@@ -2665,8 +2673,6 @@ ngx_http_post_request(ngx_http_request_t *r, ngx_http_posted_request_t *pr)
     pr->request = r;
     pr->next = NULL;
 
-    for (p = &r->main->posted_requests; *p; p = &(*p)->next) { /* void */ }
-
     *p = pr;
 
     return NGX_OK;
@@ -2786,6 +2792,8 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
 
             r->main->count--;
 
+            r->write_event_handler = ngx_http_request_empty_handler;
+
             if (pr->postponed && pr->postponed->request == r) {
                 pr->postponed = pr->postponed->next;
             }