cookie issue
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There is an utm cookie issue for cached page.
step 1, view domain.com/?utm_source=111
You set two cookies utm_source for domain.com and .domain.com (JavaScript & PHP)
domain.com utm_source=111
.domain.com utm_source=111step 2, change the utm_source value,for example domain.com/?utm_source=222
You only update the cookie value for domain.com
domain.com utm_source=222
.domain.com utm_source=111The cookie of .domain.com will never change.
So sometimes we cannot get the newest utm cookies.
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