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After my user shelved Safari for a long time and did not close it (a few days), he was unable to request our webpage. After investigation, it was found that the CDN resource request was not sent out. At the same time, chrome is accessed normally. After restarting Safari browser or dig CDN host, it can be accessed normally. I suspect that it is a cache bug of safari 13. It seems that some cache headers of CDN can trigger this bug, resulting in the failure to request resources normally Reproduce Safari version: 13.0.3, 13.0.5, 13.1.3.