Why can't I just ask for pictures on this site?

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url: http://www.mm131.com/xinggan/...
the picture of this website. You can view it when you open the page normally. But the copy pic link, which is opened in new tab, is 301 (remove the local cache).
it"s no use adding referer with postman.
how does it do that?

< hr >

recently found that Baidu map recognition can also grab, why can"t I grab it?

Hotlink-protection authentication

Jun.29,2022

collect?

should be to determine the source

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