http://en.wikipedia.org/wiki/Java_Servlet
Servlets can be generated automatically from Java Server Pages (JSP) by the JavaServer Pages compiler. The difference between servlets and JSP is that servlets typically embed HTML inside Java code, while JSPs embed Java code in HTML.
Technologies like FastCGI and its derivatives (including SCGI, WSGI) do not exhibit the performance disadvantages of CGI incurred by the constant process spawning. They are, however, roughly as simple as CGI. They are therefore also in contrast with servlets which are substantially more complex.
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