Detecting a WordPress URL without doing a full HTTP GET?

From my experience and quick code search there are no deliberate ways WP identifies itself in headers. However there are some that seem distinct enough and not likely to be customized.

HEAD to /wp-login.php will contain following for .org install:

 Set-Cookie: wordpress_test_cookie=WP+Cookie+check; path=/

And for .com:

Set-Cookie: wordpress_test_cookie=WP+Cookie+check; path=/; domain=.wordpress.com

Cookie name is customizable by defining TEST_COOKIE constant, but WP Cookie check string is hardcoded in core, as well as set_cookie() call for this in the file’s source.

For locating wp-login.php there are some URL shortcuts (implemented in wp_redirect_admin_locations() since WP 3.4 (see ticket #19607 ):

/login on site’s root does 302 redirect to wp-login.php, wherever it is.

So the only scenario that cannot be reliably detected if WP is installed in and confined to subdirectory, without being used to manage site’s root at all.

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