new file mode 100644
--- /dev/null
+++ b/js_headers.t
@@ -0,0 +1,145 @@
+#!/usr/bin/perl
+
+# (C) Dmitry Volyntsev
+# (C) Nginx, Inc.
+
+# Tests for http njs module, working with headers.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+use Config;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http charset/)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    js_include test.js;
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location /njs {
+            js_content test_njs;
+        }
+
+        location /content_length {
+            js_content content_length;
+        }
+
+        location /content_type {
+            charset windows-1251;
+
+            default_type text/plain;
+            js_content content_type;
+        }
+
+        location /content_encoding {
+            js_content content_encoding;
+        }
+
+        location /headers_list {
+            js_content headers_list;
+        }
+    }
+}
+
+EOF
+
+$t->write_file('test.js', <<EOF);
+    function test_njs(r) {
+        r.return(200, njs.version);
+    }
+
+    function content_length(r) {
+        r.headersOut['Content-Length'] = '';
+        r.headersOut['Content-Length'] = 3;
+        delete r.headersOut['Content-Length'];
+        r.headersOut['Content-Length'] = 3;
+        r.sendHeader();
+        r.send('XXX');
+        r.finish();
+    }
+
+    function content_type(r) {
+        r.headersOut['Content-Type'] = 'text/xml';
+        r.headersOut['Content-Type'] = '';
+        r.headersOut['Content-Type'] = 'text/xml; charset=';
+        delete r.headersOut['Content-Type'];
+        r.headersOut['Content-Type'] = 'text/xml; charset=utf-8';
+        r.headersOut['Content-Type'] = 'text/xml; charset="utf-8"';
+        r.return(200);
+    }
+
+    function content_encoding(r) {
+        r.headersOut['Content-Encoding'] = '';
+        r.headersOut['Content-Encoding'] = 'test';
+        delete r.headersOut['Content-Encoding'];
+        r.headersOut['Content-Encoding'] = 'gzip';
+        r.return(200);
+    }
+
+    function headers_list(r) {
+        for (var h in {a:1, b:2, c:3}) {
+            r.headersOut[h] = h;
+        }
+
+        delete r.headersOut.b;
+        r.headersOut.d = 'd';
+
+        var out = "";
+        for (var h in r.headersOut) {
+            out += h + ":";
+        }
+
+        r.return(200, out);
+    }
+
+EOF
+
+$t->try_run('no njs')->plan(5);
+
+###############################################################################
+
+
+TODO: {
+local $TODO = 'not yet'
+		unless http_get('/njs') =~ /^([.0-9]+)$/m && $1 ge '0.2.8';
+
+like(http_get('/content_length'), qr/Content-Length: 3/,
+	'set Content-Length');
+like(http_get('/content_type'), qr/Content-Type: text\/xml; charset="utf-8"\r/,
+	'set Content-Type');
+unlike(http_get('/content_type'), qr/Content-Type: text\/plain/,
+	'set Content-Type 2');
+like(http_get('/content_encoding'), qr/Content-Encoding: gzip/,
+	'set Content-Encoding');
+like(http_get('/headers_list'), qr/a:c:d/, 'headers list');
+
+}
+
+###############################################################################