Return the image to the front end, but sometimes, the front end cache will let us not replace the image, so we have to cheat the front end, how to cheat?
Just add one, right? To trick the front end, this question mark can trick the front end, indicating that this image is not the image in the cache.
For example, the back end returns the following image:
Each time with variable random number returns the picture.
a.jpg?63
and
b.jpg?193
This way, the front-end image cache doesn’t care, because every time it thinks it’s the latest data returned
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