Applied patch by Natrak: - page_header() now adds Last-Modified and ETag http headers. - When running PHP as an Apache module page_header() will check the HTTP headers for conditional gets, and will only push the content when it fails. (Works for html and xml pages as they are all cached). Note: this is a PHP limitation, so until PHP makes it work for other web servers this won't work for them. - Added created field to cache database to hold the timestamp when the cache was created. - Changed cache_get() to return an object with ->data and ->created. - Update forum and locale modules.
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