"Sent unsupported FastCGI protocol version" error with keepalive about hyperfastcgi HOT 3 CLOSED

mysql -u root -p
create database forum;
create user 'admin'@'localhost' identified by 'admin';
grant all privileges on forum.* to 'admin'@'localhost';
exit

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
sudo apt-get update
sudo apt-get install mono-complete
sudo apt-get install git
git clone https://github.com/xplicit/HyperFastCgi.githyperfastcgi4 `--config=server.config`
sudo apt-get install autoconf automake libtool make libglib2.0-dev libevent-dev
cd HyperFastCgi/
./autogen.sh --prefix=/usr
 make
 sudo make install

git clone https://github.com/Ustimov/Forums.git
cd Forums/
sudo apt-get install nuget
nuget restore
xbuild /p:Configuration=Release

upstream fastcgi_backend {
  server 127.0.0.1:9000;
  keepalive 32;
}
server {
  listen 8000;
  server_name localhost:8000;
  error_log /var/log/nginx/Forum.Error.log;

  location / {
    root /root/Forums/Forum/;
    index index.html index.htm default.aspx Default.aspx;
    fastcgi_index Default.aspx;
    fastcgi_keep_conn on;
    fastcgi_pass fastcgi_backend;
    include /etc/nginx/fastcgi_params;
  }
}

rm /etc/nginx/sites-enabled/default
ln -s /etc/nginx/sites-available/forum /etc/nginx/sites-enabled/forum
sudo service nginx restart

<configuration>
        <server type="HyperFastCgi.ApplicationServers.SimpleApplicationServer">
                <!-- Host factory defines how host will be created. SystemWebHostFactory creates host in AppDomain in standard ASP.NET way --> 
                <host-factory>HyperFastCgi.HostFactories.SystemWebHostFactory</host-factory>
                <!-- <threads> creates threads at startup. Value "0" means default value --> 
                <threads min-worker="40" max-worker="0" min-io="4" max-io="0" />
                <!--- Sets the application host root directory -->
                <!-- <root-dir>/path/to/your/dir</root-dir> -->
        </server>
        <listener type="HyperFastCgi.Listeners.NativeListener">
                <apphost-transport type="HyperFastCgi.Transports.NativeTransport">
                        <multithreading>Single</multithreading>
                </apphost-transport>
            <protocol>InterNetwork</protocol>
            <address>127.0.0.1</address>
            <port>9000</port>
        </listener>
    <apphost type="HyperFastCgi.AppHosts.AspNet.AspNetApplicationHost">
                <log level="Debug" write-to-console="true" />
                <add-trailing-slash>false</add-trailing-slash>
    </apphost>
    <web-applications>
        <web-application>
                <name>Forum</name>
                <vhost>0.0.0.0</vhost>
                <vport>8000</vport>
                <vpath>/</vpath>
                <path>/root/Forums/Forum/</path>
        </web-application>
    </web-applications>
</configuration>

git clone https://github.com/s-stupnikov/technopark-db-api.git
cd technopark-db-api/tests/
nano perf_test.py 
change CONFIG_PATH = '/usr/local/etc/test.conf' to CONFIG_PATH = '../conf/test.conf'

sudo apt-get install httperf
httperf --hog --client=0/1 --server=127.0.0.1 --port=8000 --uri=/ --send-buffer=4096 --recv-buffer=16384 --add-header='Content-Type:application/json\n' --wsesslog=100,0.000,ustimov_httperf_scenario

2016/06/04 14:00:25 [error] 1633#0: *77 upstream sent too big header while reading response header from upstream, client: 127.0.0.1, server: localhost:8000, request: "GET /db/api/user/listPosts?limit=29&user=amizy%40ua.ru&order=asc HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "localhost"
2016/06/04 14:00:25 [error] 1633#0: *79 upstream sent too big header while reading response header from upstream, client: 127.0.0.1, server: localhost:8000, request: "GET /db/api/forum/listPosts?related=forum&related=thread&limit=25&order=asc&forum=1lnro HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "localhost"

             fastcgi_buffer_size 512k;
             fastcgi_buffers 512 4k;