5.1. Servlet Equivalent of CGI Variables
For each standard CGI variable, this section summarizes its purpose and the means of accessing it from a servlet. As usual, once you are familiar with this information, you may want to use Appendix A (Servlet and JSP Quick Reference) as a reminder. Assume request is the HttpServletRequest supplied to the doGet and doPost methods.
AUTH_TYPE
If an Authorization header was supplied, this variable gives the scheme specified (basic or digest). Access it with request.getAuthType().
CONTENT_LENGTH
For POST requests only, this variable stores the number of bytes of data sent, as given by the Content-Length request header. Technically, since the CONTENT_LENGTH CGI variable is a string, the servlet equivalent is
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