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I make a mistake of leaving the title of a RSS feed empty when I publish it. So the feed title appear as "title unknown" in RSS readers when people subscribe to it.Now that the title has been added in, is there a way to forces the feed title in the end user's RSS feed reader (ie. Google Reader)?

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RSS is a text file. How are you generating it ? Some clients will reload title information from time to time, others will never change it after the user has subscribed to your feed.koan

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As koan already said, some RSS-Readers might never check for this again and other might do it every time they fetch your RSS-Feed for new updates.

Although, RSS offers you the <ttl>-sub-element for the <channel>-element, which is:

a number of minutes that indicates how long a channel can be cached before refreshing from the source.

(see the RSS-specs).

The docs however do not give any idea about how this "refreshing" has to look, so some RSS-Readers might only reload the items and some might even ignore it.

It's a good idea to use the <pubDate> and <lastBuildDate> elements which might also have an impact on how and if the contents are reloaded. If you use a script to create your RSS-Feed, this might be implemented already.

Also, users which previously subscribed to your RSS-Feed might already have changed the title on the Reader manually, so adding a <title>-element only has an impact on new subscribers.