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Internet media types (previously known as “MIME types”) with “X-” prefixes are now discouraged.

• vineyardmike 3y ago
  For many in this thread, X is now discouraged as well. /s
  • lucb1e 3y ago
    I don't understand, how is this sarcasm?
    • teddyh 3y ago
      They mean that X the social media platform, formerly known as Twitter, is now discouraged, since Nitter is no longer a viable method for accessing it.