new file mode 100644
--- /dev/null
+++ b/limit_rate.t
@@ -0,0 +1,114 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for limit_rate and limit_rate_after directives.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+plan(skip_all => 'win32') if $^O eq 'MSWin32';
+
+my $t = Test::Nginx->new()->has(qw/http proxy/);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    log_format test escape=none $uri:$arg_a$arg_xal:$upstream_response_time;
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location / {
+            proxy_pass http://127.0.0.1:8081;
+            access_log %%TESTDIR%%/test.log test;
+        }
+    }
+
+    server {
+        listen       127.0.0.1:8081;
+        server_name  localhost;
+
+        limit_rate 12k;
+        limit_rate_after 256;
+
+        location /data {
+            add_header X-Accel-Redirect $arg_xar;
+            add_header X-Accel-Limit-Rate $arg_xal;
+        }
+
+        location /redirect {
+            limit_rate 0;
+            alias %%TESTDIR%%/data;
+        }
+
+        location /var {
+            alias %%TESTDIR%%/data;
+            limit_rate $arg_l;
+            limit_rate_after $arg_a;
+        }
+
+        location /proxy/ {
+            proxy_pass http://127.0.0.1:8081/;
+        }
+    }
+}
+
+EOF
+
+$t->write_file('data', 'X' x 30000);
+$t->try_run('no limit_rate variables')->plan(7);
+
+###############################################################################
+
+# NB: response time may be 1s less, if timer is scheduled on upper half second
+
+like(http_get('/data'), qr/^(XXXXXXXXXX){3000}\x0d?\x0a?$/m, 'response body');
+like($t->read_file('test.log'), qr/data::[12]/, 'limit_rate');
+
+# /proxy -> /redirect
+# before 1.17.0, limit was set once in ngx_http_update_location_config()
+
+http_get('/proxy/data?xar=/redirect');
+like($t->read_file('test.log'), qr!proxy/data::0!, 'X-Accel-Redirect');
+
+# X-Accel-Limit-Rate has higher precedence
+
+http_get('/proxy/data?xar=/redirect&xal=25000');
+like($t->read_file('test.log'), qr!proxy/data:25000:1!, 'X-Accel-Limit-Rate');
+
+http_get('/var?l=12k&a=256');
+like($t->read_file('test.log'), qr/var:256:[12]/, 'variable');
+
+http_get('/var?l=12k&a=40k');
+like($t->read_file('test.log'), qr/var:40k:0/, 'variable after');
+
+http_get('/var');
+like($t->read_file('test.log'), qr/var::0/, 'variables unset');
+
+###############################################################################