initial commit

app/format.php

@@ -0,0 +1,29 @@
+<?php
+
+class Format {
+	
+	function __construct (&$app) {
+		$this->app =& $app;
+	}
+	
+	function call (&$env) {
+		
+		// available formats
+		$formats = array("txt" => "text/plain", "xml" => "application/xml");
+		
+		// call the next middleware in the stack
+		list($status, $headers, $body) = $this->app->call($env);
+		
+		// do something with response headers
+		foreach( $formats as $key => $value ) {
+			if ( !empty($env["request.vars"]["format"]) && $env["request.get"]["format"] == $key ) {
+				$headers["Content-Type"] = $value;
+			}
+		}
+		
+		return array($status, $headers, $body);
+	}
+	
+}
+
+?>