Add deprecation notice

Author: joshdick

README.md

@@ -1,14 +1,47 @@
+# :rotating_light::warning: Warning: Deprecated/no longer maintained! :warning::rotating_light:
+
+**As of April 26th, 2020, miniProxy is no longer maintained, and no further changes will be made to it (including security-related changes).**
+
+When miniProxy was first released as [PageForward](http://pageforward.sf.net) in 2005, the Internet was dramatically different than it is as of this writing fifteen years later, in 2020.
+
+Since 2005, web standards and web browsers have improved dramatically, both in terms of available functionality and in terms of security for end users.
+
+Over time, those welcome improvements have made it more difficult (and inherently less secure) to maintain and use a web proxy such as miniProxy. miniProxy provides a flawed and subpar browsing experience with the modern web.
+
+I have also had no personal use for miniProxy in quite some time, which caused the effort I put into maintaining it to be minimal at best.
+
+Given all of the above, I believe miniProxy's useful lifetime has now come to an end, and I have decided to stop maintaining it.
+
+This GitHub repository is now archived, but will remain online for future reference for as long as is feasible.
+
+If you continue to use miniProxy, you do so **entirely at your own risk** (as its [GNU GPL v3 license](https://www.gnu.org/licenses/gpl-3.0.html) has always stated, quoted below) and with the understanding that **no web proxy can perfectly anonymize your web browsing.**
+
+> THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+> APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+> HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+> OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+> THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+> PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+> IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+> ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+Thank you for using and contributing to miniProxy and PageForward for the past fifteen years!
+
+-Josh
+
+---
+
 # miniProxy
 
 *by Joshua Dick*
 
-*[http://joshdick.github.io/miniProxy][1]*
+*[http://joshdick.github.io/miniProxy](http://joshdick.github.io/miniProxy)*
 
 ---
 
 ## About miniProxy
 
-miniProxy is a simple web proxy written in PHP that can allow you to bypass Internet content filters, or to browse the internet anonymously. miniProxy is licensed under the [GNU GPL v3][2]. miniProxy is the successor to [pageForward][3].
+miniProxy is a simple web proxy written in PHP that can allow you to bypass Internet content filters, or to browse the internet anonymously. miniProxy is licensed under the [GNU GPL v3](https://www.gnu.org/licenses/gpl-3.0.html). miniProxy is the successor to [PageForward](http://pageforward.sf.net).
 
 ## Prerequisites
 
@@ -30,9 +63,5 @@ miniProxy has several known limitations. Some of them may be fixed in future rel
 
 ## Contact and Feedback
 
-If you'd like to contribute to miniProxy or file a bug or feature request, please visit [its GitHub page][4].
+If you'd like to contribute to miniProxy or file a bug or feature request, please visit [its GitHub page](https://github.com/joshdick/miniProxy).
 
-  [1]: http://joshdick.github.io/miniProxy
-  [2]: http://www.gnu.org/licenses/gpl.html
-  [3]: http://pageforward.sf.net
-  [4]: https://github.com/joshdick/miniProxy

miniProxy.php

@@ -1,8 +1,14 @@
 <?php
+/*
+NOTE: miniProxy IS NO LONGER MAINTAINED AS OF APRIL 26th, 2020.
+IF YOU USE IT, YOU DO SO ENTIRELY AT YOUR OWN RISK.
+More information is available at <https://github.com/joshdick/miniProxy>.
+*/
+
 /*
 miniProxy - A simple PHP web proxy. <https://github.com/joshdick/miniProxy>
 Written and maintained by Joshua Dick <http://joshdick.net>.
-miniProxy is licensed under the GNU GPL v3 <http://www.gnu.org/licenses/gpl.html>.
+miniProxy is licensed under the GNU GPL v3 <https://www.gnu.org/licenses/gpl-3.0.html>.
 */
 
 /****************************** START CONFIGURATION ******************************/