The idea in mod_ssl is mainly the following: because mod_ssl provides mostly a superset of the functionality of all other solutions we can easily provide backward compatibility for most of the cases. Actually there are three compatibility areas we currently address: configuration directives, environment variables and custom log functions. Configuration Directives
Environment VariablesWhen you use ``SSLOptions +CompatEnvVars'' additional environment
variables are generated. They all correspond to existing official mod_ssl
variables. The currently implemented variable derivation is listed in Table 2.
Custom Log FunctionsWhen mod_ssl is built into Apache or at least loaded (under DSO situation) additional functions exist for the Custom Log Format of mod_log_config as documented in the Reference Chapter. Beside the ``%{varname}x''
eXtension format function which can be used to expand any variables provided
by any module, an additional Cryptography
``%{name}c'' cryptography format function
exists for backward compatibility. The currently implemented function calls
are listed in Table 3.
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ere we talk about backward compatibility to other SSL solutions. As you
perhaps know, mod_ssl is not the only existing SSL solution for Apache.
Actually there are four additional major products available on the market: Ben
Laurie's freely available