Same Origin Policy and subdomains

StackOverflow https://stackoverflow.com/questions/23202794

Question

Whether http://acme.help.com and http://acme.com can be considered as same origin? Will it fall under SO restrictions?

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Solution

Yup, it will fail. In order for origins to be considered same-origin, their scheme, host and port must match. Here are some examples: http://en.wikipedia.org/wiki/Same-origin_policy#Origin_determination_rules

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