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1. Embed this notice
   jomo (jomo@mstdn.io)'s status on Thursday, 21-Dec-2023 13:09:09 JST jomo

   TIL #Discord effectively does traffic amplification when users post an image. They crawl the image URL using a Discordbot User-Agent, but in the same second request the same URL with a spoofed Mac OS browser User-Agent that can't be identified as a Discord request.

   Both request are required for the image to render in Discord chat. Absolutely great!

   https://github.com/discord/discord-api-docs/issues/1600#issuecomment-628529359

   • Embed this notice
     feld (feld@bikeshed.party)'s status on Thursday, 21-Dec-2023 13:09:08 JST feld

     in reply to
     @jomo how are they supposed to know if it's an image they should embed vs a link preview without crawling it first?
   • Embed this notice
     feld (feld@bikeshed.party)'s status on Thursday, 21-Dec-2023 13:17:20 JST feld

     in reply to
     @jomo nope, it's not that simple. Some sites won't give you the Opengraph/Twittercard tags unless you have Bot in your user agent and some sites likely reject requests to media if you have Bot in your user agent
     
     I had to put Bot in Pleroma's to fix link previews to a bunch of news sites. We don't embed image links but if we wanted to I expect I'd need to do the same thing to make it work everywhere with confidence
   • Embed this notice
     jomo (jomo@mstdn.io)'s status on Thursday, 21-Dec-2023 13:17:21 JST jomo

     in reply to

     • feld

     @feld well they don't have to request it twice for that, they already have the content after their first crawl.

   • Embed this notice
     jomo (jomo@mstdn.io)'s status on Thursday, 21-Dec-2023 13:24:32 JST jomo

     in reply to

     • feld

     @feld this is happening for images that are embedded as  in Discord, you don't need to fetch any opengraph tags for that.

     feld likes this.