![]() 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.Swagger UI is hosted on the same server as the application itself (same host and port).There are two cases where no action is needed for CORS support: ![]() ![]() Most browsers + JavaScript toolkits not only support CORS but enforce it, which has implications for your API server which supports Swagger. CORS is a technique to prevent websites from doing bad things with your personal data. ![]()
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