I fetched images with LWP::UserAgent,

Are you GET-ing the images just to get their size? HEAD not work for you?

...but what's going on? Any ideas?

You're talking HTTP :) Now for some ideas

• Maybe you're not seeing all there is
• Maybe the server you're talking to is not sending all it should
• Maybe your browser is choosing to interpret that particular 202 as 404
• What url?
• Show the headers from a request/response cycle from your browser (you can use LiveHTTPHeaders if you got Mozilla)
• Show the same from LWP (for example lwp-request -m get -USe url)

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