In some cases, you might not have access to server-side code.įor example, if you're using a third-party service for authentication, notification, sending emails, etc., you might run into this problem. ![]() It requires you to make modifications on the server side. While the server-side fix to CORS is the most technically coherent solution to this problem, there's a small catch. Let's head back to our server's app.js file.Īpp.get('/cors', (req, res) => ) Later we'll explore a way to work around this on the client side, but the most reliable solution is to always make the response from the server CORS-friendly. Hence, logically, CORS should always be handled from the server side. Therefore, it makes sense to configure the response from the server in such a way that the browser identifies this as a CORS request. It's only something that your browser imposes, and it suggests that your requested resource should be configured differently. If you think about it, your client doesn't have anything to do with CORS. ![]() It states that there's a missing Access-Control-Allow-Origin header on the resource you requested. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. Only headers with these names will be allowed to be sent by Swagger UI.Access to fetch at ' from origin ' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. From our example above: Access-Control-Allow-Headers: Content-Type, api_key, Authorization The name of these headers MUST be supported in your CORS configuration as well. Swagger UI lets you easily send headers as parameters to requests. Other servers/frameworks may provide you information on how to enable it specifically in their use case. provides information on how to enable CORS in some common web servers. The method of enabling CORS depends on the server and/or framework you use to host your application. Keep in mind this will show a successful result even if Access-Control-Allow-Headers is not available, which is still required for Swagger UI to function properly. Use the website to verify CORS support.Swagger UI cannot easily show this error state. Origin 'null' is therefore not allowed access. No 'Access-Control-Allow-Origin' header is present on the requested resource. If CORS is not enabled, you'll see something like this: Try Swagger UI from your file system and look at the debug console.This tells us that the petstore resource listing supports OPTIONS, and the following headers: Content-Type, api_key, Authorization. For instance:Īccess-Control-Allow-Methods: GET, POST, DELETE, PUT, PATCH, OPTIONSĪccess-Control-Allow-Headers: Content-Type, api_key, Authorization Curl your API and inspect the headers.You can verify CORS support with one of three techniques: For the Try it now button to work, CORS needs to be enabled on your API endpoints as well.For Swagger 2.0 it's the swagger.json/ swagger.yaml and any externally $refed docs. Otherwise, CORS support needs to be enabled for: This may already be covered within your organization. The application is located behind a proxy that enables the required CORS headers. ![]()
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