I know how to redirect to https with PHP, but does anyone know how to redirect only if the site is requested via HTTP and HTTPS is available on the server?
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- doob0526 2016-03-04 16:21关注
I don't know of a way to check a server's available protocols via php. Also, if there is one, you get lost when you want to check and redirect to a remote server. So in order to check wether your destination server is capable of handling https request you need to query it. Here is an example with php-curl:
<?php /** * Check wether a destination is reachable. * * @param string $uri uri to check * * @return bool */ function checkAvailability($uri) { $handle = curl_init($uri); curl_setopt_array($handle, [ CURLOPT_RETURNTRANSFER => 1, CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1' ]); $r = curl_exec($handle); $responseCode = (int)curl_getinfo($handle, CURLINFO_HTTP_CODE); curl_close($handle); return $responseCode > 199 && $responseCode < 400; } //we test by checking the webpages of two of my local newspapers, l-iz.de will succeed, lvz.de will not var_dump(checkAvailability('https://www.l-iz.de')); var_dump(checkAvailability('https://lvz.de'));
The method checkAvailability simple tests if a curling url returns a success HTTP-Code between 200 and 399. This is not as accurate as it could be, but shall be sufficient for this use case. So if you call this method with a https url you get your desired info wether a webserver accepts https traffic
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