WordPress at a glance
function is not described

wp_get_http() WP 2.5.0

Deprecated in 4.4.0. It is no longer supported and can be removed in future releases. Use WP_Http instead.

Perform a HTTP HEAD or GET request.

If $file_path is a writable filename, this will do a GET request and write the file to that path.

No Hooks.

Return

true/false/String. False on failure and string of headers if HEAD request.

Usage

wp_get_http( $url, $file_path, $red );
$url(string) (required)
URL to fetch.
$file_path(string/true/false)
File path to write request to.
Default: false
$red(int)
The number of Redirects followed, Upon 5 being hit, returns false.
Default: 1

Code of wp get http: wp-includes/deprecated.php VER 5.0.3

<?php
function wp_get_http( $url, $file_path = false, $red = 1 ) {
	_deprecated_function( __FUNCTION__, '4.4.0', 'WP_Http' );

	@set_time_limit( 60 );

	if ( $red > 5 )
		return false;

	$options = array();
	$options['redirection'] = 5;

	if ( false == $file_path )
		$options['method'] = 'HEAD';
	else
		$options['method'] = 'GET';

	$response = wp_safe_remote_request( $url, $options );

	if ( is_wp_error( $response ) )
		return false;

	$headers = wp_remote_retrieve_headers( $response );
	$headers['response'] = wp_remote_retrieve_response_code( $response );

	// WP_HTTP no longer follows redirects for HEAD requests.
	if ( 'HEAD' == $options['method'] && in_array($headers['response'], array(301, 302)) && isset( $headers['location'] ) ) {
		return wp_get_http( $headers['location'], $file_path, ++$red );
	}

	if ( false == $file_path )
		return $headers;

	// GET request - write it to the supplied filename
	$out_fp = fopen($file_path, 'w');
	if ( !$out_fp )
		return $headers;

	fwrite( $out_fp,  wp_remote_retrieve_body( $response ) );
	fclose($out_fp);
	clearstatcache();

	return $headers;
}