By Marty Hall
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Extra resources for Core Servlets And Javaserver Pages (Jsp)
Com. © Prentice Hall and Sun Microsystems. Personal use only; do not redistribute. 3 JavaServer Pages 100-element array then write into the 999th “element,” which is really some random part of program memory. So programmers who forget to do this check themselves open their system up to deliberate or accidental buffer overflow attacks. Servlets suffer from neither of these problems. Even if a servlet executes a remote system call to invoke a program on the local operating system, it does not use a shell to do so.
That’s because an HTTP response consists of the status line, one or more headers, a blank line, and the actual document, in that order. The headers can appear in any order, and servlets buffer the headers and send them all at once, so it is legal to set the status code (part of the first line returned) even after setting headers. But servlets do not necessarily buffer the document itself, since users might want to see partial results for long pages. 1 of the servlet specification, the PrintWriter output is not buffered at all, so the first time you use the PrintWriter, it is too late to go back and set headers.