Adding examples from official website

It's handy to have everything you need in one repository. Source files were mostly pulled from Eli's website with only a minor edit. http://eligrey.com/blog/post/pmxdr-postmessage-cross-domain-request-library
eligrey · Apr 3, 2013 · f73ccdf · f73ccdf
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diff --git a/apache_php/README.md b/apache_php/README.md
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+This is how one could use PHP and Apache to serve up the host portion to
+make pmxdr work.
+
+Installation:
+
+1.  Create a `pmxdr` directory at your document root.
+2.  Copy in the `htaccess` here to `.htaccess` in your document root, or merge it with your own rules.  This Rewrites calls from `/pmxdr/api` to `/pmxdr/api.php`
+3.  Copy in `pmxdr-host.js` to the `pmxdr` folder in your document root.
+4.  Optional:  Minify `pmxdr-host.js` and put that into the `pmxdr` folder too.  If you do this, modify `api.php` to include your minified version.
+5.  Edit `api.php` and set up your allowed hosts.
diff --git a/apache_php/api.php b/apache_php/api.php
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+<?php
+//pmxdr host server-side logic
+
+ob_start("ob_gzhandler");
+
+$version = "0.0.6";
+
+header("Content-Type: text/html; charset=UTF-8");
+header("ETag: ".$version);
+//Uncomment to cache for almost forever
+//header('Expires: Wed, 31 Dec 9999 00:00:00 GMT');
+
+?><!doctype html><script type="text/javascript"><?php include('pmxdr-host.js')?></script>
diff --git a/apache_php/htaccess b/apache_php/htaccess
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+RewriteEngine On
+
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME} !-d
+RewriteCond %{REQUEST_FILENAME}.php -f
+RewriteRule (.*) $1.php [L,QSA]