Nginx + fastcgi truncation problem

python ./manage.py runfcgi umask=000 maxchildren=5 maxspare=1 minspare=0 method=prefork socket=/path/to/runfiles/django.sock pidfile=/path/to/runfiles/django.pid

# search and replace this: {project_location}
pid /path/to/runfiles/nginx.pid;
worker_processes  2;
error_log /path/to/runfiles/error_log;
events {
    worker_connections  1024;
    use epoll;
}
http {
    # default nginx location
    include        /etc/nginx/mime.types;
    default_type    application/octet-stream;
    log_format main
        '$remote_addr - $remote_user [$time_local] '
            '"$request" $status $bytes_sent '
        '"$http_referer" "$http_user_agent" '
        '"$gzip_ratio"';
    client_header_timeout  3m;
    client_body_timeout    3m;
    send_timeout           3m;
    connection_pool_size        256;
    client_header_buffer_size    1k;
    large_client_header_buffers    4 2k;
    request_pool_size        4k;
    output_buffers   4 32k;
    postpone_output  1460;
    sendfile        on;
    tcp_nopush             on;
    keepalive_timeout      75 20;
    tcp_nodelay            on;
    client_max_body_size       10m;
    client_body_buffer_size    256k;
    proxy_connect_timeout      90;
    proxy_send_timeout         90;
    proxy_read_timeout         90;
    client_body_temp_path      /path/to/runfiles/client_body_temp;
    proxy_temp_path            /path/to/runfiles/proxy_temp;
    fastcgi_temp_path            /path/to/runfiles/fastcgi_temp;
    gzip on;
    gzip_min_length  1100;
    gzip_buffers     4 32k;
    gzip_types       text/plain text/html application/x-javascript text/xml text/css;
    ignore_invalid_headers    on;
    server {
        listen 80;
        server_name alpha2.sonyalabs.com;
        index index.html;
        root   /path/to/django-root/static;
        # static resources
        location ~* ^/static/.*$
        {
    	root   /path/to/django-root;
                expires 30d;
                break;
        }
        location / {
            # host and port to fastcgi server
            fastcgi_pass unix:/path/to/runfiles/django.sock;
            fastcgi_param PATH_INFO $fastcgi_script_name;
            fastcgi_param REQUEST_METHOD $request_method;
            fastcgi_param QUERY_STRING $query_string;
            fastcgi_param CONTENT_TYPE $content_type;
            fastcgi_param CONTENT_LENGTH $content_length;
            fastcgi_pass_header Authorization;
            fastcgi_intercept_errors off;
        }
        location /403.html {
                root   /usr/local/nginx;
                access_log   off;
        }
        location /401.html {
                root   /usr/local/nginx;
                access_log   off;
        }
        location /404.html {
                root   /usr/local/nginx;
                access_log   off;
        }
        location = /_.gif {
                    empty_gif;
                access_log   off;
        }
            access_log    /path/to/runfiles/localhost.access_log main;
            error_log    /path/to/runfiles/localhost.error_log;
        }
}