.htaccess 移动重定向在第一次移动点击后被所有访问者看到

Question

I very recently migrated to a new web host.

I have a redirect in htaccess, that sends mobile users to a mobile site, based on the detected user_agent. This htaccess and associated website/s worked perfectly with my old host.

With my current host, whenever I enable this rewrite rule, as soon as a mobile user visits the root of desktop site, they as expected, get redirected to the mobile site however, all subsequent requests to the desktop site on any device, get redirected to the mobile site. ie it appears that the redirect to the mobile is cached and that cached redirect then gets served to all visitors regardless of user_agent until I disable the htaccess and they clear their caches.

My hosting company say that they are not developers and they cannot help with my code, that there is something wrong with it that's causing this issue but they can't tell me what. :-|

Please could someone cast their eyes over the below and tell me what if anything, is wrong with it.

ps. This is shared hosting so i don't have access to the logs.

RewriteEngine on
# http://mywebsite.co.uk => https://www.mywebsite.co.uk
RewriteCond %{SERVER_PORT} 80
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule (.*) https://www.%{HTTP_HOST}/$1 [R=301,L]


# https://mywebsite.co.uk => https://www.mywebsite.co.uk
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule (.*) https://www.%{HTTP_HOST}/$1 [R=301,L]


## Redirect to mobile site

RewriteBase /
RewriteCond %{HTTP_USER_AGENT} (android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge\ |maemo|midp|mmp|mobile.+firefox|netfront|opera\ m(ob|in)i|palm(\ os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows\ ce|xda|xiino [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a\ wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r\ |s\ )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1\ u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp(\ i|ip)|hs\-c|ht(c(\-|\ |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac(\ |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt(\ |\/)|klon|kpt\ |kwc\-|kyo(c|k)|le(no|xi)|lg(\ g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-|\ |o|v)|zz)|mt(50|p1|v\ )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v\ )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-|\ )|webc|whit|wi(g\ |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-) [NC]

RewriteCond %{HTTP_HOST} !^mobile\. [NC]
RewriteRule ^(.*)$ https://mobile.mywebsite.co.uk [E=NO_CACHE,R,L]

Header always set Cache-Control "private, no-cache" env=NO_CACHE

Answer 1

If you are making redirect decisions based on the user agent, you need to tell caching proxy servers and CDNs that they need to check to see how each user agent redirects rather than returning the same result as the first user.

To do that in .htaccess you can just add the line:

Header append Vary User-Agent