If you are running a production web server that it out there on the internet, then you should be wary of the information that can be obtained from a misconfigured page or something that may cause an unexpected error. When apache throws an error page or a directory index, it usually shows a version string, something similar to this:
Apache/2.0.58 (Ubuntu) PHP/4.4.2-1.1 Server at zeus Port 80
If you don
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