Requests_Proxy_HTTP::fsockopen_header( string $out )
Add extra headers to the request before sending
Parameters
- $out
-  (string) (Required) HTTP header string 
Source
File: wp-includes/Requests/Proxy/HTTP.php
public function fsockopen_header(&$out) {
		$out .= sprintf("Proxy-Authorization: Basic %s\r\n", base64_encode($this->get_auth_string()));
	}  Changelog
| Version | Description | 
|---|---|
| 1.6 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/classes/requests_proxy_http/fsockopen_header