One of the more important topics in web application security is the same
origin policy. It is a browser-based defense mechanism that makes it so that
certain conditions must be met before content (usually JavaScript) will be
run when served from a given website.
The rules are fairly simple: content wishing to run from a given location
must match all three of the following things:
Domain
Port
Protocol
One way of remembering this is with the acronym DPP. So, the Same Origin
Policy (SOP) pertains to domain, port, and protocol (DPP). Or,
SOP = DPP.
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