Description:
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I set the expose_php = Off in php.ini file and restarted the apache server. When I check the response headers for my site, server doesn't return the 'X-Powered-By' header. But when I check the response headers for subdomains, it returns the 'X-Powered-By' header.

Reproduce code:
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I've kept only html codes in both index.php files(my domain and subdomain home page)

Expected result:
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Response Headers
Date	Fri, 30 May 2008 07:26:52 GMT
Server	Apache/1.3.39 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_ssl/2.8.30 OpenSSL/0.9.7a
Last-Modified	Sat, 29 Dec 2007 07:36:29 GMT
Etag	"44c015-1d89-4775f8fd"
Accept-Ranges	bytes
Content-Length	7561
Keep-Alive	timeout=8, max=100
Connection	Keep-Alive
Content-Type	text/html

Actual result:
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Response Headers
Date	Fri, 30 May 2008 07:25:12 GMT
Server	Apache/1.3.39 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_ssl/2.8.30 OpenSSL/0.9.7a
Cache-Control	no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Expires	Thu, 19 Nov 1981 08:52:00 GMT
Pragma	no-cache
X-Powered-By	PHP/4.4.8
Keep-Alive	timeout=8, max=100
Connection	Keep-Alive
Transfer-Encoding	chunked
Content-Type	text/html