WP_CLI\Utils\http_request()

WP_CLI\Utils\http_request( $method, $url, $data = null, $headers = [], $options = [] )

$method (string) HTTP method (GET, POST, DELETE, etc.).
$url (string) URL to make the HTTP request to.
$data (array|null) Data to send either as a query string for GET/HEAD requests,
or in the body for POST requests.
$headers (array) Add specific headers to the request.
$options (array) {
Optional. An associative array of additional request options.
@type bool $halt_on_error Whether or not command execution should be halted on error. Default: true
@type bool|string $verify A boolean to use enable/disable SSL verification
or string absolute path to CA cert to use.
Defaults to detected CA cert bundled with the Requests library.
@type bool $insecure Whether to retry automatically without certificate validation.
}
@return (\Requests_Response|Response)

# `wp core download` verifies the hash for a downloaded WordPress archive

$md5_response = Utils\http_request( 'GET', $download_url . '.md5' );
if ( 20 != substr( $md5_response->status_code, 0, 2 ) ) {
     WP_CLI::error( "Couldn't access md5 hash for release (HTTP code {$response->status_code})" );
}