At Zend_Http_Response incubator version, extractBody method is written by following code. static public function extractBody(&$response_str) { $lines = explode("\r\n", $response_str); $line = null; while ($line !== "") $line = array_shift($lines); $body = implode("\r\n", $lines); return $body; } But, if an invalid response with no blank lines is returned, it causes an inifinite loop. ex) http://web.sfc.keio.ac.jp/~s01133su/mt/archives/000259.html returns response with no CRLFs So, please check whether $lines is empty or not in the following loop. while ($line !== "") $line = array_shift($lines);