In case anyone has similar problem, I’ve found the bug in my solution, it wasn’t easy to find.
The server I used has CASE SENSITIVE file system, and my image’s real file names were e.g. “a.JPG”, instead of “https://stackoverflow.com/questions/10942338/a.jpg” as in code! Of course, this wasn’t a problem on my local, case-insesitive file system, only on server.
I had no idea that server file systems could be case sensitive, now I know… 🙂
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solved Why are my images broken when loaded via JavaScript?