- From: Chuck Houpt <chuck@habilis.net>
- Date: Mon, 4 Mar 2024 10:49:07 -0500
- To: Simon Laub <simonlaub.mail@gmail.com>
- Cc: W3C WWW Validator <www-validator@w3.org>
> On Mar 3, 2024, at 10:05 AM, Simon Laub <simonlaub.mail@gmail.com> wrote: > > I got the following unexpected response when trying to retrieve <https://simonlaub.net/Post/2024/Onwards2024/Onwards2024.html>: > 555 > But this error is not explained on? > https://validator.w3.org/docs/errors.html > > So, what to do? The 555 error is generated by your web server's firewall. Probably an overzealous rule to block any uncommon User-Agent strings. Below is an example of using Curl, which produces the same error. To fix this you'll need to contact your web server administrator. An immediate work-around is to directly access the Nu Html Checker at https://validator.w3.org/nu/ , which is currently not blocked by your server. Cheers - Chuck % curl -i https://simonlaub.net/Post/2024/Onwards2024/Onwards2024.html HTTP/2 555 server: nginx ... 555 Security Incident Detected Your request was blocked. If you are the owner of the website: The Website Application Firewall that is protecting your website has blocked this request for being suspicious. You can see the detailed reason for this in your webserver logs.
Received on Monday, 4 March 2024 15:49:24 UTC