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mod ssl
mod_ssl is an optional module for the Apache HTTP Server. It provides strong cryptography for the Apache v1.3 and v2 webserver via the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) cryptographic protocols by the help of the Open Source SSL/TLS toolkit OpenSSL.
The original version created for Apache v1.3 was initially created in April 1998 by Ralf S. Engelschall via porting Ben Laurie's (Apache-SSL ) 1.17 source patches for Apache 1.2.6 to Apache 1.3b6.〔(【引用サイトリンク】url=http://www.modssl.org/docs/2.8/ssl_faq.html#history )〕 This version is under a BSD-style license. The version for v2.0 and later, in contrast, is maintained by Apache Software Foundation and licensed under Apache License 2.0.
It is possible to provide HTTP and HTTPS with a single server machine, because HTTP and HTTPS use different server ports, so there is no direct conflict between them. It is either the maintainer would run two separate Apache server instances (one binds to port 80, the other to port 443) or even use Apache's virtual hosting facility where the maintainer can create two virtual servers which Apache dispatches: one responding to port 80 and speaking HTTP and one responding to port 443 speaking HTTPS.
==Differences between Apache versions==
The original mod_ssl in Apache 1.3 available at (www.modssl.com ) is a third-party add-on package requiring additional steps in the compilation and configuration process. Also, the maintainer of the server needs to resolve additional system and Apache dependencies. Apache 2, in contrast, is a built-in module maintained by Apache Software Foundation, and mod_ssl can be easily activated in the compilation and configuration options.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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