| Security & Bot Defense | |
| Basic HTTP authentication scheme that sends a username and password with each request | 17.2M sites |
| HSTS HTTP header forcing browsers to use secure HTTPS connections | 117.3M sites |
| Web Servers & Operating Systems | |
| Apache HTTP Server Long-established open-source web server software | 67.2M sites |
| other | |
| Seavus-As | 96 sites |
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