title: How can I extract the gif files requested by a GET request with Http response 200 from a log?
body: <p>I have the next log file and I need to extract the gif files which were requested by a GET request and its status was 200.</p>
  
  <pre><code>unicomp6.unicomp.net ‐ ‐ [01/Jul/1995:00:00:06 ‐0400] "GET /shuttle/countdown/ HTTP/1.0" 200 3985
  burger.letters.com ‐ ‐ [01/Jul/1995:00:00:11 ‐0400] "GET /shuttle/countdown/liftoff.html HTTP/1.0" 304 0
  burger.letters.com ‐ ‐ [01/Jul/1995:00:00:12 ‐0400] "GET /images/NASA‐logosmall.gif HTTP/1.0" 304 0
  burger.letters.com ‐ ‐ [01/Jul/1995:00:00:12 ‐0400] "GET/shuttle/countdown/video/livevideo.gif HTTP/1.0" 200 0
  d104.aa.net ‐ ‐ [01/Jul/1995:00:00:13 ‐0400] "GET /shuttle/countdown/HTTP/1.0" 200 3985
  unicomp6.unicomp.net ‐ ‐ [01/Jul/1995:00:00:14 ‐0400] "GET/shuttle/countdown/count.gif HTTP/1.0" 200 40310
  unicomp6.unicomp.net ‐ ‐ [01/Jul/1995:00:00:14 ‐0400] "GET /images/NASA‐logosmall.gif HTTP/1.0" 200 786
  unicomp6.unicomp.net ‐ ‐ [01/Jul/1995:00:00:14 ‐0400] "GET /images/KSC‐logosmall.gif HTTP/1.0" 200 1204
  d104.aa.net ‐ ‐ [01/Jul/1995:00:00:15 ‐0400] "GET/shuttle/countdown/count.gif HTTP/1.0" 200 40310
  d104.aa.net ‐ ‐ [01/Jul/1995:00:00:15 ‐0400] "GET /images/NASA‐logosmall.gif HTTP/1.0" 200 786
  </code></pre>
  
  <p>From the above example the response must be:</p>
  
  <pre><code>livevideo.gif
  count.gif
  NASA-logo.gif
  KSC-logosmall.gif
  </code></pre>
  
  <p>As you can see in the response there are not duplicates, for example in the row 6 we have the count.gif record requested by a Get and with status 200, the same happens in the row 9 and in the response we have only one count.gif record.</p>