How do Third-Party “tracking cookies” work?

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我寻月下人不归 2020-12-07 07:29

I have read this question here: How Do Internet Advertisers Use Third-Party Cookies? on how third-party tracking cookies work, but am still very confused. I don\'t understa

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天涯浪人 (楼主)

2020-12-07 08:11

First, cookies are set and retrieved through HTTP headers. If your browser sends a request to http://example.com, then the response might come back with a header that says Set-Cookie: foo=bar. Your browser stores this cookie, and on any subsequent requests to http://example.com, your browser will send foo=bar in the Cookie header. (Or at least until the cookie expires or is deleted.) The browser sends the foo=bar cookie with any request to http://example.com, regardless of who initiated the request or what the context is. If http://example2.com contains the tag , then the browser will send the cookie foo=bar when it fetches http://example.com/img.jpg, even though http://example2.com is responsible for the request being sent.

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