Redirect a site to a Mobile version, error with Google Mobile-Friendly Test

Question

I have the following urls :

domain.fr     (desktop site)
domain.fr/m/  (mobile site)

• Both urls "point" to each other using"canonical" or "alternate".
• We can access those urls without problem.

I would like to redirect people on mobile to : domain.fr/m/

in PHP, I tried :

$useragent=$_SERVER['HTTP_USER_AGENT'];

if(preg_match('/(android|bb\d+).+mobile|....',substr($useragent,0,4))){header('Location: http://domain.fr/m/');}

Problem : When I check domain.fr with Google Mobile-Friendly Test, I get this error message :

(it's like Google can't check if this is mobile friendly)

If I remove the PHP above, Google can do the test but says domain.fr is NOT user-friendly.

How to make a redirection to the mobile site, I think it's a problem with the PHP code, any idea ?

Answer 1

okay I found the solution :

The php redirection was correct, but the code was executed for both mobile and desktop sites.

I had to make the redirection only for domain.fr, otherwise the redirection was infinited (executed also when on mobile site), and consequently Google sent this error message "dismiss".. it was not easy to understand..

Answer 2

I think you have a bug in your code, try to analyze logs of your web server.

I have test at Google Mobile-friendly test and in Google Page Speed, all works fine.

Nginx logs:

127.0.0.1 - - [22/Aug/2015:16:29:16 +0300] "GET /test.mobile.php HTTP/1.1" 301 18 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F70 Safari/600.1.4 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
127.0.0.1 - - [22/Aug/2015:16:29:18 +0300] "GET / HTTP/1.1" 200 17211 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F70 Safari/600.1.4 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

PHP:

$useragent = $_SERVER['HTTP_USER_AGENT'];

$devices = ['iphone', 'android'];
if ( arrayInString( $devices, strtolower( $useragent ) ) ) {
    header("HTTP/1.0 301 Moved Permanently");
    header("Location: http://mysite.ua" . strtolower( $_SERVER['REQUEST_URI'] ) );
    die("Redirect");
}


function arrayInString( $inArray , $inString ) {
    if( is_array( $inArray ) ) {
        foreach( $inArray as $e ) {
            if( strpos( $inString , $e ) !== false )
                return true;
        }
        return false;
    } else {
        return ( strpos( $inString , $inArray ) !== false );
    }
}

But I recomend use nginx for such redirection

Answer 3

@Julien First, do not close Link tag!

<link rel="alternate" href="http://luckeo.fr/m/" media="only screen and (max-width: 640px)">

Alternate "link" its just SEO link, it does not redirect any user. And, you must redirect google and other users to mobile version. Read this article: https://developers.google.com/webmasters/mobile-sites/mobile-seo/common-mistakes/faulty-redirects?hl=fr

You got "dismis" from google tests, because you have some bugs in your php-redirects, try my redirect below