SSI has (and always had) a very limited set of functions that should never have been competitive with real scripting languages. Thus, the technology is lively and good. Not much to develop ...
Regarding server-side scripting languages: suppose you mean the embedded languages ββon the web server? I know nothing but SSI here (and, if you want to count this, the regular expression URL manipulation capabilities offered by Apache mod_rewrite ). This is an area of ββ"real" languages ββand development platforms.
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