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    "Last-modified" http header


    HI all... I have been looking around for a direct answer to my question on the forum but have had no luck, so here goes.

    My site is. (psbspeakers.com) most of the content is dynamically created on most pages. it will be a ton of work to write a script that checks when the last Database change was done then display that in the "Last-modified" http header.

    currently it looks like no "Last-modified" data is being returned by the site. So is this a huge deal? if it worth the work to implement? or should I leave it as is?
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    when the bots visit your webpages, if it find some new content on your website it will index the new one. If you are changing the content on a regular visit i.e. bots find new cntent on every visit, they will visit you page on a smaller interval, no matter you are declaring the lastmod tag or not. but if you want to declare the last modified tag for all the pages you can declare it on your sitemap file. Just create a sitemap file after each modification and upload this on root and resubmit it in google webmaster tools. you do not need a lastmod header declaration on your page, as if the bot is visiting your page it will index it no matter there is something new or not. if it is not visiting they will not see the lastmod header as well. So declaring lastmod header is of no use in both the cases.

    regards
    zabalex
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    Ya i could put it in the sitemaps. but since my site is not returning the last date all the auto sitmap creators return todays date, not the date of creation. SO i would have to go through my site one page at a time putting in the proper publish date for search page into my sitemap. Not a fun job!.
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    I may be missing the point entirely here,
    but couldn't you just use the int getlastmod PHP function? If your pages are all being displayed dynamically, it shouldn't be too difficult to implement?
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    Originally Posted by Ryaen
    I may be missing the point entirely here,
    but couldn't you just use the int getlastmod PHP function? If your pages are all being displayed dynamically, it shouldn't be too difficult to implement?
    Thanks! ya I guess I could do that (and will). But I was really wonder if google will penalize me for not doing it? not sure how much priority they put on http header tags i guess

    Also, don't know why I did not see it before but my "Expires:" tage is set to:

    Expires: Thu, 19 Nov 1981 08:52:00 GMT


    Crazy!
    How much do you guys think this type of thing hurts a site?

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