new file mode 100644
--- /dev/null
+++ b/h2_http2.t
@@ -0,0 +1,168 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for HTTP/2 protocol, http2 directive.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+use Test::Nginx::HTTP2;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http http_ssl http_v2 socket_ssl_alpn/)
+	->has_daemon('openssl');
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    ssl_certificate_key localhost.key;
+    ssl_certificate localhost.crt;
+
+    server {
+        listen       127.0.0.1:8443 ssl;
+        server_name  default;
+
+        http2 on;
+    }
+
+    server {
+        listen       127.0.0.1:8443;
+        server_name  http2;
+
+        http2 on;
+    }
+
+    server {
+        listen       127.0.0.1:8443;
+        server_name  disabled;
+
+        http2 off;
+    }
+
+    server {
+        listen       127.0.0.1:8444 ssl;
+        server_name  default;
+    }
+
+    server {
+        listen       127.0.0.1:8444;
+        server_name  http2;
+
+        http2 on;
+    }
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        http2 on;
+    }
+
+    server {
+        listen       127.0.0.1:8081 http2;
+        server_name  localhost;
+    }
+}
+
+EOF
+
+$t->write_file('openssl.conf', <<EOF);
+[ req ]
+default_bits = 2048
+encrypt_key = no
+distinguished_name = req_distinguished_name
+[ req_distinguished_name ]
+EOF
+
+my $d = $t->testdir();
+
+foreach my $name ('localhost') {
+	system('openssl req -x509 -new '
+		. "-config $d/openssl.conf -subj /CN=$name/ "
+		. "-out $d/$name.crt -keyout $d/$name.key "
+		. ">>$d/openssl.out 2>&1") == 0
+		or die "Can't create certificate for $name: $!\n";
+}
+
+$t->write_file('index.html', '');
+$t->try_run('no http2')->plan(11);
+
+###############################################################################
+
+# make sure HTTP/2 can be disabled selectively on virtual servers
+
+ok(get_ssl_socket(8443), 'default to enabled');
+ok(!get_ssl_socket(8443, 'disabled'), 'sni to disabled');
+
+is(get_https(8443, 'http2'), 200, 'host to enabled');
+is(get_https(8443, 'disabled', 'http2'), 421, 'host to disabled');
+
+# make sure HTTP/2 can be enabled selectively on virtual servers
+
+ok(!get_ssl_socket(8444), 'default to disabled');
+is(get_https(8444, 'http2'), 200, 'sni to enabled');
+
+# http2 detection on plain tcp socket by connection preface
+
+like(http_get('/'), qr/200 OK/, 'non-ssl http');
+is(get_http(8080), 200, 'non-ssl http2');
+
+like(http_get('/', socket => IO::Socket::INET->new('127.0.0.1:' . port(8081))),
+	qr/200 OK/, 'non-ssl http deprecated');
+is(get_http(8081), 200, 'non-ssl http2 deprecated');
+
+my $sock = http("PRI * HTTP/2.0\r\n\r\n", start => 1);
+select undef, undef, undef, 0.2;
+is(get_http(8080, 'localhost', $sock, "SM\r\n\r\n"), 200,
+	'preface with multiple packets');
+
+###############################################################################
+
+sub get_http {
+	my ($port, $host, $sock, $preface) = @_;
+	my $s = Test::Nginx::HTTP2->new(port($port),
+		socket => $sock, preface => $preface);
+	my $sid = $s->new_stream({ host => $host });
+	my $frames = $s->read(all => [{ sid => $sid, fin => 1 }]);
+	my ($frame) = grep { $_->{type} eq "HEADERS" } @$frames;
+	return $frame->{headers}->{':status'};
+}
+
+sub get_https {
+	my ($port, $host, $sni, $alpn) = @_;
+	my $sock = get_ssl_socket($port, $sni || $host, $alpn);
+	return get_http($port, $host, $sock);
+}
+
+sub get_ssl_socket {
+	my ($port, $sni, $alpn) = @_;
+	return http('', PeerAddr => '127.0.0.1:' . port($port), start => 1,
+		SSL => 1,
+		SSL_hostname => $sni,
+		SSL_alpn_protocols => $alpn || ['h2']);
+}
+
+###############################################################################