======
  package require http
  proc getPage { url } {
        # no cleanup, so we lose some memory on every call
        return [ ::http::data [ ::http::geturl $url ] ]
  }

  set file [ getPage $url ]
======
----
The above is a basic example of the [http] package.  
It however doesn't account for proxys, URL redirects, etc.  
See [grabchat] for code which tries to handle some additional issues.

Some further examples can be found at the [http] page.

The example above omits cleanup, so memory consumption rises when you use it to get many pages. 
The example below cares for cleanup.

----

======
 package require http
 proc getPage { url } {
       set token [::http::geturl $url]
       set data [::http::data $token]
       ::http::cleanup $token          
       return $data
 }
======

----

[KPV] If you need to download lots of files, check out [Parallel Geturl] which
lets you overlap many ''getPage'' calls simultaneously.

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