Index: class-http.php
===================================================================
--- class-http.php	(revision 20371)
+++ class-http.php	(working copy)
@@ -1540,7 +1540,7 @@
 		if ( empty( $this->name ) || empty( $this->value ) )
 			return '';
 
-		return $this->name . '=' . urlencode( $this->value );
+		return $this->name . '=' . apply_filters( 'wp_http_cookie_value', $this->value, $this-name );
 	}
 
 	/**