new file mode 100644
--- /dev/null
+++ b/h2_request_body_preread.t
@@ -0,0 +1,184 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for HTTP/2 protocol with preread request body.
+
+###############################################################################
+
+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 $t = Test::Nginx->new()->has(qw/http http_v2 proxy limit_req shmem/);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    limit_req_zone   $binary_remote_addr  zone=req:1m rate=1r/s;
+
+    server {
+        listen       127.0.0.1:%%PORT_0%% http2;
+        listen       127.0.0.1:%%PORT_1%%;
+        server_name  localhost;
+
+        http2_body_preread_size 10;
+
+        location /t { }
+        location / {
+            add_header X-Body $request_body;
+            proxy_pass http://127.0.0.1:%%PORT_1%%/t;
+
+            location /req {
+                limit_req  zone=req burst=2;
+                proxy_pass http://127.0.0.1:%%PORT_1%%/t;
+            }
+        }
+    }
+
+    server {
+        listen       127.0.0.1:%%PORT_2%% http2;
+        server_name  localhost;
+
+        http2_body_preread_size 0;
+
+        location / {
+            add_header X-Body $request_body;
+            proxy_pass http://127.0.0.1:%%PORT_1%%/t;
+
+            location /req {
+                limit_req  zone=req burst=2;
+                proxy_pass http://127.0.0.1:%%PORT_1%%/t;
+            }
+        }
+    }
+
+    server {
+        listen       127.0.0.1:%%PORT_3%% http2;
+        server_name  localhost;
+
+        location / {
+            add_header X-Body $request_body;
+            proxy_pass http://127.0.0.1:%%PORT_1%%/t;
+        }
+    }
+}
+
+EOF
+
+$t->write_file('t', '');
+$t->try_run('no http2_body_preread_size')->plan(8);
+
+###############################################################################
+
+# request body within preread size (that is, stream window)
+
+my $s = Test::Nginx::HTTP2->new();
+my $sid = $s->new_stream({ body => 'TEST' });
+my $frames = $s->read(all => [{ sid => $sid, fin => 1 }]);
+
+my ($frame) = grep { $_->{type} eq "HEADERS" } @$frames;
+is($frame->{headers}->{'x-body'}, 'TEST', 'within preread');
+
+# request body beyond preread size
+# RST_STREAM expected due stream window violation
+
+TODO: {
+local $TODO = 'not yet';
+
+$s = Test::Nginx::HTTP2->new();
+$sid = $s->new_stream({ body => 'TEST' x 10 });
+$frames = $s->read(all => [{ type => 'RST_STREAM' }], wait => 0.5);
+
+($frame) = grep { $_->{type} eq "RST_STREAM" } @$frames;
+is($frame->{code}, 3, 'beyond preread - FLOW_CONTROL_ERROR');
+
+}
+
+# within preread size - limited
+
+$s = Test::Nginx::HTTP2->new();
+$sid = $s->new_stream({ path => '/req' });
+$frames = $s->read(all => [{ sid => $sid, fin => 1 }]);
+
+$sid = $s->new_stream({ path => '/req', body => 'TEST' });
+$frames = $s->read(all => [{ sid => $sid, fin => 1 }]);
+
+($frame) = grep { $_->{type} eq "HEADERS" } @$frames;
+is($frame->{headers}->{'x-body'}, 'TEST', 'within preread limited');
+
+# beyond preread size - limited
+
+$s = Test::Nginx::HTTP2->new();
+$sid = $s->new_stream({ path => '/req', body => 'TEST' x 10 });
+$frames = $s->read(all => [{ type => 'RST_STREAM' }]);
+
+($frame) = grep { $_->{type} eq "RST_STREAM" } @$frames;
+is($frame->{code}, 3, 'beyond preread limited - FLOW_CONTROL_ERROR');
+
+
+# zero preread size
+
+TODO: {
+local $TODO = 'not yet';
+
+$s = Test::Nginx::HTTP2->new(port(2));
+$sid = $s->new_stream({ body => 'TEST' });
+$frames = $s->read(all => [{ type => 'RST_STREAM' }], wait => 0.5);
+
+($frame) = grep { $_->{type} eq "RST_STREAM" } @$frames;
+is($frame->{code}, 3, 'zero preread - FLOW_CONTROL_ERROR');
+
+}
+
+# zero preread size - limited
+
+$s = Test::Nginx::HTTP2->new(port(2));
+$sid = $s->new_stream({ path => '/req', body => 'TEST' });
+$frames = $s->read(all => [{ type => 'RST_STREAM' }]);
+
+($frame) = grep { $_->{type} eq "RST_STREAM" } @$frames;
+is($frame->{code}, 3, 'zero preread limited - FLOW_CONTROL_ERROR');
+
+
+# REFUSED_STREAM on request body prior SETTINGS acknowledgement
+
+$s = Test::Nginx::HTTP2->new(port(0), pure => 1);
+$sid = $s->new_stream({ body => 'TEST' });
+$frames = $s->read(all => [{ type => 'RST_STREAM' }]);
+
+($frame) = grep { $_->{type} eq "RST_STREAM" } @$frames;
+is($frame->{code}, 7, 'no SETTINGS ack - REFUSED_STREAM');
+
+# default preread size - no REFUSED_STREAM expected
+
+$s = Test::Nginx::HTTP2->new(port(3), pure => 1);
+$sid = $s->new_stream({ body => 'TEST' });
+$frames = $s->read(all => [{ sid => $sid, fin => 1 }]);
+
+($frame) = grep { $_->{type} eq "HEADERS" } @$frames;
+is($frame->{headers}->{'x-body'}, 'TEST', 'no SETTINGS ack - default preread');
+
+###############################################################################