security - Why do links in gmail redirect? -

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i've noticed email services (like gmail or school's webmail) redirect links (or used to) in email body. when put "www.google.com" in body of email, , check email in gmail or something, link says "gmail.com/redirect?www.google.com".

this confusing me , people emailed (like parents, not familiar computers). clicked on link anyway, why service used? (i'm worried maybe information being sent somewhere... have worry about? being stored before redirect?)

sorry if unwarranted paranoia. curious why things work way do.

this redirection dereferrer avoid disclosure of url in http referer field third party sites url can contain sensitive data session id.


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