Updated tex files with latest information about the program

docs/src/appendix/ApacheAppendex.tex

@@ -1,10 +1,11 @@
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-% FILE    : ApacheAppendix.tex
-% SUBJECT : ApacheApendex.
-% AUTHOR  : (C) Copyright 2018 by Locusworks
-%
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-
 \chapter{Apache Configuration}
 \label{sample-httpd.conf}
-\lstinputlisting[caption=httpd.conf]{figures/httpd.conf}
+For Apache HTTP Server 2.4.47 or newer, \command{mod\_proxy\_http} can forward WebSocket upgrades. Enable \command{mod\_proxy}, \command{mod\_proxy\_http}, \command{mod\_headers}, and the TLS modules. Place these directives in your HTTPS virtual host, with your hostname and certificates configured separately:
+\begin{lstlisting}[caption={Apache forwarding directives}]
+ProxyRequests Off
+ProxyPreserveHost On
+RequestHeader set X-Forwarded-Proto "https"
+ProxyPass /portal/ http://127.0.0.1:8080/portal/ upgrade=websocket
+ProxyPassReverse /portal/ http://127.0.0.1:8080/portal/
+\end{lstlisting}
+Redirect the HTTP site to HTTPS. Match proxy request limits and timeouts to the application. Consult \url{https://httpd.apache.org/docs/2.4/mod/mod_proxy_http.html} for the installed Apache version's upgrade handling.