How can I get web server information about a page I'm viewing (e.g. Apache or IIS, Windows or UNIX)?

How can I get web server information about a page I'm viewing (e.g. Apache or IIS, Windows or UNIX)? "When I check pages for broken links using Xenu's Link Sleuth it usefully lists information about the web server, OS and PHP version e.g."
Asked by: Guest \| Views: 276

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Guest [Entry]

The Web Developer toolbar for Firefox has among its many options a way to view page response headers. (Information | View Response Headers)

Guest [Entry]

"Or from Chrome Dev Tools

Network > All > Headers

Refresh the page then click the site name at the top of the list in the 'Name' panel and look at the Response Headers:

Though for security, fewer and fewer sites include this information nowadays."