cookies) linked to each domain, and one website shouldn't be able to make requests which might use your credentials & sessions for an unrelated domain. The browser now needs to make a request from the user's machine to that other host.īrowsers are very cautious about doing that last step, for two main reasons.įirst, browsers often have credentials (e.g.Your content includes JavaScript, which makes a request to another origin (let's say ).You serve some content to your user via your origin (let's say ). How do CORS proxies work, and what real-world security problems can they create? Why is CORS a problem? That feels convenient, but turning off security feels dangerous. If you're struggling with it, you might discover the concept of a 'CORS proxy' that promises to solve this, like cors-anywhere or one of the many 'free CORS proxy' hosted services.ĬORS proxies let you bypass the security restrictions that CORS applies, with just a tiny change of URL.
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