Problem with caching enabled

If I disable "Cache pages for anonymous users" and clear the cache, it looks work for a while. But after several hours, It looks like to use drupal cache again.

I don't like to use different subdomain (m.****, mobile.****). And I think it's the purpose of this module to enable mobile version without using different subdomain.

Hello Clément,

You post this bug on three modules with same content:

• http://drupal.org/node/1591210 (Mobile Switch)
• http://drupal.org/node/1591208 (Mobile Theme, this issue)
• http://drupal.org/node/1591202 (Switchtheme)

Your message

This module works only for registered users (without Drupal cache)

is to simple and not really constructive. A module maintainer can not understand the problem.

And, please no Drupal vs Wordpress discussions (see #2).

A fix to this is just what I was looking for! However, I'm a coding newbie and was wondering, after you install the Dynamic Cache module, where do you put that code you mentioned for the fix?

Thanks!

#4 is not good solution.

I still want cache.
I am using Varnish cache (external)

Here are steps:
1) enable "external page cache" (http://drupal.org/node/797346)
used following snippet:

if (!class_exists('DrupalFakeCache')) {
  $conf['cache_backends'][] = 'includes/cache-install.inc';
}
// Rely on the external cache for page caching.
$conf['cache_class_cache_page'] = 'DrupalFakeCache';

2) modify vcl_hash to separate different presentations for same URL but different user-agent (http://bridgecitystudio.com/tutorials/configuring-varnish-cache-user-age...)

sub vcl_recv {
  ...
  # mobile devices detection
  call detect_device;
  ...
}

sub detect_device {
  # Define the desktop device
  set req.http.X-Device = "desktop";

  if (req.http.User-Agent ~ "iP(hone|od)" ||
      req.http.User-Agent ~ "Android" ||
      req.http.User-Agent ~ "iPad") {
    # Define smartphones and tablets
    set req.http.X-Device = "smart";
  } elseif (req.http.User-Agent ~ "SymbianOS" ||
            req.http.User-Agent ~ "^BlackBerry" ||
            req.http.User-Agent ~ "^SonyEricsson" ||
            req.http.User-Agent ~ "^Nokia" ||
            req.http.User-Agent ~ "^SAMSUNG" ||
            req.http.User-Agent ~ "^LG") {
    # Define every other mobile device
    set req.http.X-Device = "other";
  }
}

sub vcl_hash {
  hash_data(req.url);
  if (req.http.host) {
    hash_data(req.http.host);
  } else {
    hash_data(server.ip);
  }
  # add User-Agent to hash for mobile devices
  hash_data(req.http.X-Device);
  return (hash);
}

3) modify vcl_deliver - remove Etag from HTTP Response (not sure this has an effect, looks like this might help with browser caching issues when switching user-agent)

sub vcl_deliver {
  ...
  unset resp.http.Etag;
  ...
}

Hello,

Can you confirm that the last message posted is the solution ?

Thank you.

I found something that fixed the theme switch for cached pages for anonymous users for me.

The problem was with url alias chains - if a page had a url alias, that points to another alias, then the switching won't happen.

The fix I did was to just make sure that all the links had a direct alias to the node/$nid and that seems to work.

Nevermind, that doesn't work.