new file mode 100644
--- /dev/null
+++ b/rewrite_set.t
@@ -0,0 +1,107 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for rewrite set.
+
+###############################################################################
+
+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;
+
+my $t = Test::Nginx->new()->has(qw/http rewrite ssi/)->plan(4);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        ssi on;
+
+        location /t1 {
+            set $http_foo "set_foo";
+            return 200 'X<!--#echo var="http_foo" -->X';
+        }
+
+        location /t2 {
+            return 200 'X<!--#echo var="http_bar" -->X';
+        }
+
+        location /t3 {
+            return 200 'X<!--#echo var="http_baz" -->X';
+        }
+
+        location /t4 {
+            set $http_connection "bar";
+            return 200 "X${http_connection}X\n";
+        }
+
+        # set in other context
+        location /other {
+            set $http_bar "set_bar";
+        }
+    }
+}
+
+EOF
+
+$t->run();
+
+###############################################################################
+
+# prefixed variables
+
+TODO: {
+local $TODO = 'not yet';
+
+SKIP: {
+skip 'leaves coredump', 2 unless $ENV{TEST_NGINX_UNSAFE};
+
+like(http_get_extra('/t1.html', 'Foo: http_foo'), qr/Xset_fooX/,
+	'set in this context');
+like(http_get_extra('/t2.html', 'Bar: http_bar'), qr/Xhttp_barX/,
+	'set in other context');
+
+}
+}
+
+like(http_get_extra('/t3.html', 'Baz: http_baz'), qr/Xhttp_bazX/, 'not set');
+
+like(http_get('/t4.html'), qr/XbarX/, 'set get in return');
+
+###############################################################################
+
+sub http_get_extra {
+	my ($uri, $extra) = @_;
+	return http(<<EOF);
+GET $uri HTTP/1.0
+$extra
+
+EOF
+}
+
+###############################################################################