header_filter_by_lua '
    local val = ngx.header["header1"]
    if val then
            if (val ~= "name1") and (val ~= "name2") then
                return ngx.exit(400)
            end
    end
    ';

set $test 0;
if ($http_user_agent ~ "MSIE 6.0") {
  set $test 1;
}
if ($http_user_agent ~ "MSIE 7.0") {
  set $test 1;
}
if ($test = 1) {
  rewrite ^ ${ROOT_ROOT}ancient/ last;
}

upstream default {
     server 127.0.0.1:8080;
}

upstream header_test {
     server 127.0.0.1:8081;
}

# map to different upstream backends based on header
map $http_x_server_select $pool {
     default "default";
     header_test "header_test";
}