Looking at your CNAME and A record configuration for your domains, they do indeed look to be correct as you originally mentioned. The domain length or the top-level domain '.us' should not be an issue since your 'www.' subdomain is working.
http://w34.us is always returning a 404 for me and never works. I am not able to see your logs so I cannot confirm what you are seeing unfortunately. But since www.w34.us works and http://w34.us does not, this points highly to the configuration of your actual web service code as mentioned above. I am not sure why someone on Stack Exchange routed you back here since this forum is not for technical support, but you can find similar issues to this <https://stackoverflow.com/questions/48445551/google-app-engine-404-not-found-with-custom-domain?rq=1> on Stack Exchange which were fixed via proper web server code configuration. It is therefore recommended to provide further details about your actual code setup on Stack Exchange in order to follow their best practices <https://stackoverflow.com/help/how-to-ask> for receiving the best technical help. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/10605f0b-cd77-46b9-bcc8-28f7135ebedf%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
