CURLOPT_SUPPRESS_CONNECT_HEADERS

CURLOPT_SUPPRESS_CONNECT_HEADERS is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_SUPPRESS_CONNECT_HEADERS — true to suppress proxy CONNECT response headers from the user callback functions CURLOPT_HEADERFUNCTION and CURLOPT_WRITEFUNCTION, when CURLOPT_HTTPPROXYTUNNEL is used and a CONNECT request is made. Available as of PHP 7.3.0 and cURL 7.54.0

CURLOPT_SUPPRESS_CONNECT_HEADERS = 265;