php - springmvc download file problem

Question

Click to download and jump to the controller, which will request twice

This is printed, I don’t know why Mao will request it twice. If the file is small, there will be no problem. If it is large, an error will be reported directly

To solve, the code is as follows
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Answer 1

Solved! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !