4311f89e 
 XPost: news.newusers.questions 
 From: catwheezel@operamail.com 
  
 ["Followup-To:" header set to news.newusers.questions.] 
 On 2008-01-13, Esther & Fester Bestertester  wrote: 
 > When headers are downloaded from a news server, is the newsgroups header 
 > included? Or is this part of the body of the message that is downloaded 
 when 
 > requested? 
 > 
 > I am trying to filter news groups based on newsgroups and cross-posting 
 > information. My news reader app doesn't have this information when it 
 > downloads headers. 
 > 
 > Is this just because the application author chooses not to download these 
 > headers? Or is this information only available after the entire message has 
 > been downloaded? 
 > 
 > Thanks 
  
 There is a basic sub-set of the article headers which is known as the 
 'overview', and that is what a news-reader gets when it 'downloads the 
 headers'.  The essential headers in the 'overview' are 
  
  Subject: 
  From: 
  Date: 
  Message-ID: 
  References: 
  Bytes: 
  Lines: 
   
 so you can only be sure of being able to filter messages based on those 
 headers, until you have downloaded the full set of headers which normally 
 comes when you download the complete article.  Filtering on those other 
 headers is known as 'expensive' because it uses a lot more 'bandwidth'. 
 Not all newsreader programs are able to filter using headers that are 
 not part of the overview, and some are even more limited than that. 
  
 Some news-servers include an Xref header in the overview; this contains 
 the name and article number of each of the newsgroups [carried by that 
 server] to which the article has been 'cross-posted'.  If your program can 
 filter on the Xref header, that can be an efficient way of detecting 
 cross-posts without downloading the complete set of headers (including the 
 Newsgroups header) when you fetch the articles. 
  
 Some newsreader programs are able to ask the news-server to send a 
 particular header for a particular article, if it is required for 
 filtering.  But not all news-servers permit that. 
  
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