All reports of web-application-should-not-depend-unconditionally-on-apache2 for the archive. The extended description of this tag is:
The package appears to be a web application but declares a dependency against apache2 without any alternative. Most web applications should work with any decent web server, thus such a package should be satisfied if any web server providing the virtual "httpd" package is installed. This can be accomplished by declaring a package relation in the form "apache2 | httpd".
This tag has not been emitted in any package tested by Lintian.