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Google XML Sitemaps
Sitemap "LastChange" VS HTTP Header "LastModified" (2 posts)

  1. NanoG5
    Member
    Posted 1 year ago #

    Hello,

    I love this plugin, it's great and I haven't any problem / bugs so far.

    But recently I installed W3TC plugin for caching and CDN. I noticed that W3TC gives me additional HTTP header like these:

    curl -I http://www.domain.tld/post-429/
    HTTP/1.1 200 OK
    Server: nginx
    Date: Thu, 23 Aug 2012 23:46:05 GMT
    Content-Type: text/html; charset=UTF-8
    Connection: keep-alive
    Vary: Accept-Encoding
    X-Pingback: http://www.domain.tld/xmlrpc.php
    Link: <http://www.domain.tld/?p=429>; rel=shortlink
    Last-Modified: Thu, 23 Aug 2012 23:46:05 GMT
    Vary: Cookie
    Expires: Fri, 24 Aug 2012 00:46:05 GMT
    Pragma: public
    Cache-Control: public, must-revalidate, proxy-revalidate

    You can see that there is "Last-Modified" tag, which is almost always new even if the post was written in 2006. I believe it's something good, Google bot will crawl that page or site more often.

    But you also know that Google XML Sitemap gives the truth about when the post is updated (in "LastChange" column) which is 2006.

    What do you think about this? Having "LastChange" in sitemap and "Last-Modified" in HTTP header together, but the date is not same / in sync.

    Many thanks!

    http://wordpress.org/extend/plugins/google-sitemap-generator/

  2. Stingraynut
    Member
    Posted 1 year ago #

    I'd like to know this too, although on rebuilding the sitemap I don't see any changes in the last modified http header. Also i think that there is another header which can store the time and they can be compared "The Last-Modified response header specifies the last time a change was made in the returned content,

    in the form of a time stamp. ETag values are unique identifiers generated by the server and changed

    every time the object is modified. Either can be used to determine if cached content is up to date.
    When an object stored in the cache includes a Last-Modified or ETag header, the Portal Server can use

    this value to ask the remote server if the object has changed since the last time it was seen." from
    Rob

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