Requesting static assets should return 304

[JonTheNiceGuy]

Example: requests for assets such as jquery return HTTP200 then content.

Desired behaviour, first pass returns 200, then subsequent returns 304.

Workaround by removing htaccess content!

[JonTheNiceGuy]

Add this code (and make it fit) from https://github.com/CampFireManager/cfm2/blob/master/classes/Base/Response.php#L215:

    $objRequest = Container_Request::getRequest();
    $thisetag = sha1($objRequest->get_requestUrlExParams() . $body);
    header("Last-Modified: " . gmdate("D, d M Y H:i:s", self::getLastModified()) . " GMT");
    header("ETag: \"$thisetag\"");
    $arrETag = $objRequest->get_hasIfNoneMatch();
    if (is_array($arrETag)) {
        foreach ($arrETag as $etag) {
            if ($thisetag == $etag || 'W/ ' . $thisetag == $etag) {
                header('HTTP/1.1 304 ' . static::$httpStatusCodes[304]);
                exit(0);
            }
        }
    }

Add it to https://github.com/CampFireManager/cfm2/blob/master/classes/Base/Response.php#L286

[JonTheNiceGuy]

Work-around implemented (with a variety of methods - not all of them working, mind!) in PR #197