marshal_uri_from_sapi incorrectly assigns scheme

[crimsonkissaki]

zend-diactoros/src/functions/marshal_uri_from_sapi.php

Lines 173 to 181 in 1676072

	// URI scheme
	$scheme = 'http';
	$https = array_key_exists('HTTPS', $server) ? $server['HTTPS'] : false;
	if (($https && 'off' !== $https)
	|| $getHeaderFromArray('x-forwarded-proto', $headers, false) === 'https'
	) {
	$scheme = 'https';
	}
	$uri = $uri->withScheme($scheme);

This incorrectly assigns 'https' instead of 'http' due to case-sensitive comparison, causing anything using UriInterface to generate incorrect URLs.

My $_SERVER['HTTPS'] == 'OFF'