title: R multiple urls into lapply
body: <p>I have a list of urls in a character vector and I want to pause the process between
  queries because if not the x queries is rejected.</p>
  
  <pre><code>urls=c('url1','url2','url3')
  </code></pre>
  
  <p>here is want I want to do </p>
  
  <pre><code>htmlpages=lapply(urls,function(x) readLines(x) Sys.sleep(0.3))
  </code></pre>