--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -5444,6 +5444,7 @@ ngx_http_upstream(ngx_conf_t *cf, ngx_co
 
     uscf = ngx_http_upstream_add(cf, &u, NGX_HTTP_UPSTREAM_CREATE
                                          |NGX_HTTP_UPSTREAM_WEIGHT
+                                         |NGX_HTTP_UPSTREAM_MAX_CONNS
                                          |NGX_HTTP_UPSTREAM_MAX_FAILS
                                          |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
                                          |NGX_HTTP_UPSTREAM_DOWN
@@ -5545,7 +5546,7 @@ ngx_http_upstream_server(ngx_conf_t *cf,
     time_t                       fail_timeout;
     ngx_str_t                   *value, s;
     ngx_url_t                    u;
-    ngx_int_t                    weight, max_fails;
+    ngx_int_t                    weight, max_conns, max_fails;
     ngx_uint_t                   i;
     ngx_http_upstream_server_t  *us;
 
@@ -5559,6 +5560,7 @@ ngx_http_upstream_server(ngx_conf_t *cf,
     value = cf->args->elts;
 
     weight = 1;
+    max_conns = 0;
     max_fails = 1;
     fail_timeout = 10;
 
@@ -5579,6 +5581,21 @@ ngx_http_upstream_server(ngx_conf_t *cf,
             continue;
         }
 
+        if (ngx_strncmp(value[i].data, "max_conns=", 10) == 0) {
+
+            if (!(uscf->flags & NGX_HTTP_UPSTREAM_MAX_CONNS)) {
+                goto not_supported;
+            }
+
+            max_conns = ngx_atoi(&value[i].data[10], value[i].len - 10);
+
+            if (max_conns == NGX_ERROR) {
+                goto invalid;
+            }
+
+            continue;
+        }
+
         if (ngx_strncmp(value[i].data, "max_fails=", 10) == 0) {
 
             if (!(uscf->flags & NGX_HTTP_UPSTREAM_MAX_FAILS)) {
@@ -5655,6 +5672,7 @@ ngx_http_upstream_server(ngx_conf_t *cf,
     us->addrs = u.addrs;
     us->naddrs = u.naddrs;
     us->weight = weight;
+    us->max_conns = max_conns;
     us->max_fails = max_fails;
     us->fail_timeout = fail_timeout;