title: 503 error when downloading data from imdb api
body: <p>I am trying to download a plot for almost 25 000 movies with the usage of imdbpy module for python. To speed up, I'm using Pool function from Multiprocessing module. However after almost 100 requests the 503 error occurs with a following message: Service Temporarily Unavailable. After 10-15 minutes I can process again but after approximately 20 requests the same error occurs again.</p>
  
  <p>I am aware that it might be a simple block from the api to prevent too many calls however I can't find any info about maximum number of requests per time unit on the web. </p>
  
  <p>Do you have any idea how to process so many calls without being shutdown? Moreover, do you know where I can find the documentation of imdb api?</p>
  
  <p>Best</p>