(PECL pecl_http >= 0.10.0)
HttpRequest::getResponseHeader — Get response header(s)
Get response header(s) after the request has been sent.
If redirects were allowed and several responses were received, the data references the last received response.
header to read; if empty, all response headers will be returned
Returns either a string with the value of the header matching name if requested,
FALSE on failure, or an associative array containing all response headers.