Secure hypertext transfer protocol
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| HTTP |
| Persistence · Compression · SSL |
| Headers |
| ETag · Cookie · Referer |
| Status codes |
| 200 OK |
| 301 Moved permanently |
| 302 Found |
| 403 Forbidden |
| 404 Not Found |
'Secure hypertext transfer protocol' (S-HTTP) is an alternative mechanism to the https URI scheme for encrypting web communications carried over HTTP. S-HTTP is defined in RFC 2660.
Web browsers typically use HTTP to communicate with web servers, sending and receiving information without encrypting it. For sensitive transactions, such as Internet e-commerce or online access to financial accounts, the browser and server must encrypt this information. The https: URI scheme and S-HTTP were both defined in the mid 1990s to address this need. Netscape and Microsoft supported HTTPS rather than S-HTTP, leading to HTTPS becoming the de facto standard mechanism for securing web communications. S-HTTP is an alternative mechanism that is not widely used.
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