if ($_origin_id = '') {
  return              403   'ERROR: origin `$http_origin` is not allowed';
}
if ($http_x_jsproxy) {
  return              500   'ERROR: circular dependency';
}
proxy_set_header      x-jsproxy   1;
proxy_set_header      Connection  $http_connection;

set                   $_level     '';
set                   $_switched  '';
set                   $_url       '';
set                   $_ver       '';
set                   $_ref       '';
set                   $_type      '';
set                   $_mode      '';

location = /preflight {
  internal;
  access_log          off;
  more_set_headers
    'access-control-allow-origin: *'
    'access-control-allow-methods: GET,POST,PUT,PATCH,TRACE,DELETE,HEAD,OPTIONS'
    'access-control-allow-headers: --raw-info,--level,--url,--referer,--cookie,--origin,--ext,--aceh,--ver,--type,--mode,accept,accept-charset,accept-encoding,accept-language,accept-datetime,authorization,cache-control,content-length,content-type,date,if-match,if-modified-since,if-none-match,if-range,if-unmodified-since,max-forwards,pragma,range,te,upgrade,upgrade-insecure-requests,x-requested-with,chrome-proxy'
    'access-control-max-age: 1728000'
  ;
  return              204;
}


# HTTP(S) Proxy
location = /http {
  if ($http_access_control_request_headers) {
    rewrite           ^   /preflight;
  }

  access_by_lua_file    ../lua/http-dec-req-hdr.lua;

  proxy_cache           my_cache;
  proxy_pass            $_url;

  more_set_headers
    'server: $upstream_http_server'
    'content-security-policy'
    'content-security-policy-report-only'
    'x-frame-options'
  ;
  header_filter_by_lua_file   ../lua/http-enc-res-hdr.lua;
  body_filter_by_lua_file     ../lua/http-body-hash.lua;
}


# WebSocket Proxy
location = /ws {
  access_by_lua_file    ../lua/ws-dec-req-hdr.lua;
  proxy_pass            $_url;
}