![]() ![]() Let’s recall the first snippet, the one that is most often provided in other articles: We will definitely use rack-cors (like we were told to). ![]() Let’s circle back to Rails and real-life examples. In real life, when configuring CORS, we typically configure the ACAO header first. The Access-Control-Allow-Origin response header indicates whether the response can be shared with requesting code from the given origin ( source).What was not said there explicitly is that the most important header when using CORS is Access-Control-Allow-Origin: In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request ( source). CORS also relies on a mechanism by which browsers make a “preflight” request to the server hosting the cross-origin resource, in order to check that the server will permit the actual request. Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any other origins (domain, scheme, or port) than its own from which a browser should permit loading of resources.All we should know now is that the same origin has more privileges and we can loosen the rules for cross-origins by using CORS. Well, as you can see, there is a lot about cross-origin behavior in the definitions of SOP. ![]() Cross-origin reads are typically disallowed, but read access is often leaked by embedding. Cross-origin embedding is typically allowed. Examples are links, redirects, and form submissions. Cross-origin writes are typically allowed. It helps isolate potentially malicious documents, reducing possible attack vectors. The same-origin policy is a critical security mechanism that restricts how a document or script loaded from one origin can interact with a resource from another origin. If not, please go to the MDN Web Docs for more examples. These 2 have different origin because the domains ( ) are different. The 2 above have the same origin because: That seems pretty clear, doesn’t it? Let’s analyze two examples from MDN, just in case. Two objects have the same origin only when the scheme, host, and port all match ( source) Web content's origin is defined by the scheme (protocol), host (domain), and port of the URL used to access it. And the last part speaks about the CORS itself. The second is about SOP, just a short description. The first part will outline what’s an origin – the key term for what we are discussing here. To explain things better, I’ve split the introduction into three parts. I hope you don’t mind me starting with a short introduction to honor theory and then passing on to the Rails examples. So, I’d like to elaborate a little bit on what we’re doing here and how it works in real life. I’m pretty OK with copy-pasting ( I’m sometimes joking that companies could hire a Stack Overflow copy-paster), as far as there’s a “think and adjust” moment between “copy” and “paste”. Resource '*', headers : :any, methods : :any end endĪnd, unfortunately, these texts were hardly explaining to us what to actually do in production. ![]()
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