attempt to proxy multiple servers in nginx

mainsite.conf

upstream mysite {
  server unix:/tmp/gunicorn.sock fail_timeout=0;
}
upstream php5-fpm {
  server unix:/var/run/php5-fpm.sock;
}

server {
  listen 80;
  server_name mysite.com;

  client_max_body_size 4G;

  index index.php;

  access_log  /var/log/nginx/mainsite.access.log;
  error_log  /var/log/nginx/mainsite.error.log;

  error_page 404 = @notfound;
    location @notfound {
    rewrite  .*  / permanent;
  }

  location /static/ {
    alias   /opt/mysite/static/;
  }

  location /blog {
    proxy_pass http://php5-fpm;
  }

  location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://mysite;
  }

  location = /favicon.ico {
    log_not_found off;
    access_log off;
  }

  location = /robots.txt {
    allow all;
    log_not_found off;
    access_log off;
  }

  location ~ /\. {
    deny all;
  }

  location ~* /(?:uploads|files)/.*\.php$ {
    deny all;
  }

  location ~ .php$ {
    try_files $uri =404;
    include /etc/nginx/fastcgi_params;
    fastcgi_index index.php;
    fastcgi_pass php5-fpm;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  }

}