Этот тоже хорош:
+=============+================+====================+=============================================================================+
| VERSION | DATE | JAVA EE / JDK | FEATURES / CHANGES |
+=============+================+====================+=============================================================================+
| Servlet 4.0 | September 2017 | JavaEE 8 | HTTP/2 |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 3.1 | May 2013 | JavaEE 7 | Non-blocking I/O, HTTP protocol upgrade mechanism |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 3.0 | December 2009 | JavaEE 6, JavaSE 6 | Pluggability, Ease of development, Async Servlet, Security, File Uploading |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.5 | September 2005 | JavaEE 5, JavaSE 5 | Requires JavaSE 5, supports annotation |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.4 | November 2003 | J2EE 1.4, J2SE 1.3 | web.xml uses XML Schema |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.3 | August 2001 | J2EE 1.3, J2SE 1.2 | Addition of Filter |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.2 | August 1999 | J2EE 1.2, J2SE 1.2 | Becomes part of J2EE, introduced independent web applications in .war files |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.1 | November 1998 | Unspecified | First official specification, added RequestDispatcher, ServletContext |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.0 | | JDK 1.1 | Part of Java Servlet Development Kit 2.0 |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 1.0 | June 1997 | | |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
Найдено здесь: https://stackoverflow.com/a/33346887/8682071