title: Can't upload audio to telegram Bad Request: failed to get HTTP URL content
body: <p>I have working url to mp3, and I am trying to send audio to Telegram by this url. It works from time to time, but most of time it gives error </p>
  
  <pre><code>"A request to the Telegram API was unsuccessful. The server returned HTTP 400 
  Bad Request. Response body:
  [b'{"ok":false,"error_code":400,"description":"Bad Request: failed to get HTTP 
  URL content"}']"
  </code></pre>
  
  <p>And I can't understand why, because I've checked the size and type, everything is clear, I can't find no more limitations in documentation of Telegram API. Who knows what is the reason of error?</p>
  
  <p>link to mp3 - <a href="http://data3.api.xn--41a.ws/vkp/cs9-5v4.userapi.com/p15/51bdb5ec5899ed.mp3" rel="nofollow noreferrer">http://data3.api.xn--41a.ws/vkp/cs9-5v4.userapi.com/p15/51bdb5ec5899ed.mp3</a></p>