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It's a fairly common practice to use std.fileread() to create synthetic HTML pages in Varnish. Perhaps we should include an example of how to do this?

sub vcl_error {
  set obj.http.Content-Type = "text/html; charset=utf-8";
  synthetic std.fileread("/etc/varnishd/500.html");
  return (deliver);
}

The current example we have is perhaps more universal in that it's easier to copy/paste, and it includes the error message as part of the response, both of which are useful features. But there may be a lot of sites out there that would like a more elaborate error page, in which embedding directly in the VCL may not be practical.