' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. We tried adding the domain using the ASP.Net Core flavor: but it didn't work as the wildcards cannot be used within any other value.In the browser, if you send a request to your Azure API management service, sometimes you might get the CORS error, detailed error message like:Īccess to XMLHttpRequest at ' xxxxx. They are pretty well documented and can give you a good starting point if you are unfamiliar with this topic.Īllowing all origins is not a best practice unless you are implementing a public API so we wanted to limit the whitelisted domains.Ĭheck here to see an example of how the headers can be exploited if you use a wildcard. ![]() These values may be overridden by users during helm install or helm upgrade.įor more details on what helm is, charts and how to use them, please take a look over the Helm Docs. a values.yaml file that contains the default values for a chart.a _helpers.tpl: A place to put template helpers that you can re-use throughout the chart.a service.yaml: A basic manifest for creating a service endpoint for your deployment.a deployment.yaml: A basic manifest for creating a Kubernetes deployment.The preflight response can be optionally cached for the requests created in the same URL using Access-Control-Max-Age header.įor the full list of configurations available, refer to the CORS plugin documentation.Īpply the Kong CORS plugin to the IngressĪs I mentioned we use helm to handle our deploys so we have follow the basic structure (aside from Ingress and the specific project structure). We set it to false meaning we are letting Kong handle the preflight requests instead of passing them to the upstream service.įor more details on what the preflight request is, please check the MDN Web Docs. ![]() If the server allows it, then it will respond to the preflight request with another request which contains the Access-Control-Allow-Methods response header, which lists the desired method ( PUT, DELETE, etc). The preflight request is an OPTIONS request, using three HTTP request headers: Access-Control-Request-Method, Access-Control-Request-Headers, and the Origin header. The purpose of a CORS preflight request is to check whether the CORS protocol is understood by the server for specific methods and headers. your API) or if the request is handled by the Ingress itself. This flag decides if the preflight request should be handled by the upstream service (i.e. The latter was our initial setup and we'll come back to this.Ī boolean value that instructs the plugin to proxy the OPTIONS preflight request to the Upstream service. You can whitelist every domain that's allowed to call the API or allow everyone using the wildcard. List of allowed domains for the Access-Control-Allow-Origin header. This entails that the server will allow cookies to be included on cross-origin requests.įor more details on what the Access-Control-Allow-Credentials header does, please check the MDN Web Docs. ![]() If you need the requests to transfer cookies (or other user credentials) then it needs to be enabled. Enter fullscreen mode Exit fullscreen modeĪpart from enabling it, we have a few other configurations set:įlag to determine whether the Access-Control-Allow-Credentials header should be sent with true as the value.īy default, CORS does not include cookies on cross-origin requests.
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