Usually, this request will fail because of cross-origins.
In this case, the client and server have different origins.
– Mozilla FirefoxĪ client from the sends a request to s3. to access a resource from S3. These headers indicate which origins can access the API.ĬORS is an HTTP-header-based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources. We do this by the client sending request headers Access-Control-Allow-Origin. In such cases, we want to relax the security for clients calling the APIs. In many cases, we are aware of who the client is and what domain it is going to be on. By default, CORS makes a call from client to server more secure. That’s when CORS comes into the picture.Īs said previously, CORS stands for Cross-Origin Resource Sharing. By default, a request to fetch resources can fail. A website requesting resources can be on a different domain compared to the domain of the resource. When accessing these APIs, clients can request different resources, and this includes images, videos, iframes, or scripts. In a usual REST API-based application, there is a client that calls the API served by a Server. Before showing, how easy it is to enable CORS, we will cover some fundamentals in this post.
#What is pub sub in my mac library how to#
In this post, we will talk about how to use CORS (Cross-Origin Resource Sharing) in a NestJS application.
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