HTTP header order is often characteristic of a web server. The opensourceparking.com headers say Apache, but have the Date & Server headers last, a pattern which is identical to the lighttpd response and entirely unlike a typical Apache response. The etag is also not in Apache format, and matches the lighttpd format:
http://www.lighttpd.net HTTP/1.1 200 OK Content-Type: text/html ETag: "-968787920" Accept-Ranges: bytes Last-Modified: Tue, 27 Mar 2007 20:27:33 GMT Content-Length: 3665 Date: Sun, 01 Apr 2007 10:23:53 GMT Server: lighttpd/1.4.13 http://opensourceparking.com HTTP/1.1 200 OK Content-Type: text/html; charset=utf-8 ETag: "-2025453841" Accept-Ranges: bytes Last-Modified: Mon, 01 Jan 2007 15:24:53 GMT Content-Length: 2912 Date: Sun, 01 Apr 2007 10:24:30 GMT Server: Apache/2.0.54 (Debian GNU/Linux); Hello Netcraft! http://www.apache.org HTTP/1.1 200 OK Date: Sun, 01 Apr 2007 10:25:00 GMT Server: Apache/2.3.0-dev (Unix) Last-Modified: Thu, 29 Mar 2007 01:00:37 GMT ETag: "921bbd-3e5f-486b9740" Accept-Ranges: bytes Content-Length: 15967 Cache-Control: max-age=86400 Expires: Mon, 02 Apr 2007 10:25:00 GMT Vary: Accept-Encoding Content-Type: text/html
Perens downplayed the significance of Microsoft’s market share gains because they relied upon parked domains. “This is an ‘appearance’ change only, because the sites involved have no content,” he wrote in announcing the service. “But managers believe figures like those in the Netcraft report, and act on them.”
Apache is used by domain registrars Register.com, 1&1 Internet, Dotster and DirectNIC, while Demand Media/eNom uses Windows Server 2003.