Please upgrade your browser We're sorry, but we no longer support this version of your web browser. Please upgrade to a new version to be able to access our s

Please upgrade your browser We're sorry, but we no longer support this version of your web browser. Please upgrade to a new version to be able to access our site. Download browsers here [http://outdatedbrowser.com http://outdatedbrowser.com] trivago Copyright 2017 trivago | All rights reserved. Nice. Possibly someone is trying to make guesses based on User-Agent header? Then coercing user to install certain third party software? In any event, the result is: if "wrong" User-Agent header, then no access. Moreover, robots.txt does not list the UA header I used to test accessibility. Idea: If website authors prefer certain browsers to be used, then provide machine-readable list of acceptable browsers. Better yet, provide list of acceptable User-Agent headers. (Is this list provided by outdatedbrowsers.com? Not quite. For example, curl works fine and it is not listed.) IMHO: User-agent header is a header not a browser. As in the old adage that "an IP address is an IP address assigned to an interface, not a computer." The fact is, in some cases, the user is the only one who really knows what "browser" she is using.