--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -241,7 +241,9 @@ ngx_http_upstream_init(ngx_http_request_
 
     u = r->upstream;
 
-    u->request_bufs = r->request_body->bufs;
+    if (r->request_body) {
+        u->request_bufs = r->request_body->bufs;
+    }
 
     if (u->conf->method == NGX_CONF_UNSET_UINT) {
         u->method = r->method;
@@ -250,7 +252,7 @@ ngx_http_upstream_init(ngx_http_request_
         u->method = u->conf->method;
     }
 
-    if (u->create_request(r) == NGX_ERROR) {
+    if (u->create_request(r) != NGX_OK) {
         ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
         return;
     }
@@ -615,9 +617,8 @@ ngx_http_upstream_send_request(ngx_http_
         && !u->request_sent
         && c->write->pending_eof)
     {
-        ngx_log_error(NGX_LOG_ERR, c->log, c->write->kq_errno,
-                      "connect() failed");
-
+        (void) ngx_connection_error(c, c->write->kq_errno,
+                                    "kevent() reported that connect() failed");
         ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
         return;
     }
@@ -716,12 +717,6 @@ ngx_http_upstream_send_request_handler(n
         return;
     }
 
-    if (r->connection->write->eof && (!u->cachable || !u->request_sent)) {
-        ngx_http_upstream_finalize_request(r, u,
-                                           NGX_HTTP_INTERNAL_SERVER_ERROR);
-        return;
-    }
-
     ngx_http_upstream_send_request(r, u);
 }
 
@@ -1788,6 +1783,7 @@ static u_char *
 ngx_http_upstream_log_error(ngx_http_request_t *r, u_char *buf, size_t len)
 {
     u_char                 *p;
+    ngx_str_t               line;
     uintptr_t               escape;
     ngx_http_upstream_t    *u;
     ngx_peer_connection_t  *peer;
@@ -1824,33 +1820,35 @@ ngx_http_upstream_log_error(ngx_http_req
             buf += r->uri.len - u->conf->location->len + escape;
             len -= r->uri.len - u->conf->location->len + escape;
 
-            if (r->args.len) {
-                p = ngx_snprintf(buf, len, "?%V", &r->args);
-                len -= p - buf;
-                buf = p;
+        } else {
+            p = ngx_palloc(r->pool,
+                           r->uri.len - u->conf->location->len + escape);
+            if (p == NULL) {
+                return buf;
             }
 
-            return ngx_http_log_error_info(r, buf, len);
+            ngx_escape_uri(p, r->uri.data + u->conf->location->len,
+                           r->uri.len - u->conf->location->len, NGX_ESCAPE_URI);
+
+            line.len = len;
+            line.data = p;
+
+            return ngx_snprintf(buf, len, "%V", &line);
         }
 
-        p = ngx_palloc(r->pool, r->uri.len - u->conf->location->len + escape);
-        if (p == NULL) {
-            return buf;
+    } else {
+        line.len = r->uri.len - u->conf->location->len;
+        if (line.len > len) {
+            line.len = len;
         }
 
-        ngx_escape_uri(p, r->uri.data + u->conf->location->len,
-                       r->uri.len - u->conf->location->len, NGX_ESCAPE_URI);
-
-        p = ngx_cpymem(buf, p, r->uri.len - u->conf->location->len + escape);
+        line.data = r->uri.data + u->conf->location->len;
+        p = ngx_snprintf(buf, len, "%V", &line);
 
-    } else {
-        p = ngx_cpymem(buf, r->uri.data + u->conf->location->len,
-                       r->uri.len - u->conf->location->len);
+        len -= p - buf;
+        buf = p;
     }
 
-    len -= p - buf;
-    buf = p;
-
     if (r->args.len) {
         p = ngx_snprintf(buf, len, "?%V", &r->args);
         len -= p - buf;