new file mode 100644
--- /dev/null
+++ b/proxy_cache_variables.t
@@ -0,0 +1,98 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for http proxy cache, proxy_cache directive with variables.
+
+###############################################################################
+
+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 cache/)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    proxy_cache_path   %%TESTDIR%%/cache1  levels=1:2
+                       keys_zone=NAME1:1m;
+    proxy_cache_path   %%TESTDIR%%/cache2  levels=1:2
+                       keys_zone=NAME2:1m;
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location / {
+            proxy_pass    http://127.0.0.1:8081;
+
+            proxy_cache   $arg_c;
+
+            proxy_cache_valid   any      1m;
+
+            add_header X-Cache-Status $upstream_cache_status;
+        }
+    }
+
+    server {
+        listen       127.0.0.1:8081;
+        server_name  localhost;
+
+        location / {
+        }
+    }
+}
+
+EOF
+
+$t->write_file('index.html', 'SEE-THIS');
+
+$t->try_run('no proxy_cache with variables')->plan(9);
+
+###############################################################################
+
+like(http_get('/?c=NAME1'), qr/MISS.*SEE-THIS/ms, 'proxy request');
+like(http_get('/?c=NAME1'), qr/HIT.*SEE-THIS/ms, 'proxy request cached');
+
+unlike(http_head('/?c=NAME1'), qr/SEE-THIS/, 'head request');
+
+$t->write_file('index.html', 'SEE-THAT');
+
+like(http_get('/?c=NAME2'), qr/MISS.*SEE-THAT/ms, 'proxy request 2');
+like(http_get('/?c=NAME2'), qr/HIT.*SEE-THAT/ms, 'proxy request 2 cached');
+
+# some invalid cases
+
+like(http_get('/?c=NAME'), qr/ 500 /, 'proxy_cache unknown');
+like(http_get('/'), qr/(?<!X-Cache).*SEE-THAT/ms, 'proxy_cache empty');
+
+$t->write_file('index.html', 'SEE-THOSE');
+
+like(http_get('/'), qr/SEE-THOSE/, 'proxy_cache empty - not cached');
+
+like(`grep -F '[alert]' ${\($t->testdir())}/error.log`, qr/^$/s, 'no alerts');
+
+###############################################################################