The answer is that specific APIs and operations inherited the policies from their parent APIs, by using the element. How does these policies work in different scopes? If you have been using APIM policy before, you will notice that CORS policy can be added into the global level(All APIs) or the specific API level(An operation), which means that there are policies in APIs and there are also policies in specific operations. Understanding how CORS policy work in different scopes Here is a document for the CORS policy in APIM service You will need to navigate to the inbound policy and check if you have this element added. To troubleshoot t he CORS issue with the APIM service, usually we need to prepare ourselves with the following aspects.Ĭheck ing if you have the CORS policy added to the inbound policy In my case, I am sending a request from my developer portal, so ‘ ' need s to be added to the Access-Control-Allow-Origin field. You might need to make sure the request origin URL has been added here. P lease p ay attention to the response header: Access-Control-Allow-Origin. I n the request header, the ‘ Access-Control-Request-Headers ’ and ‘Access-Control-Request-Method’ has been added. Step 1: There will be an Options request first. Cross-site requests are preflighted like this since they may have implications to user data. Preflight: "preflighted" requests the browser first sends an HTTP request using the OPTIONS method to the resource on the other origin, in order to determine if the actual request is safe to send. In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request. ’, two different domains.ĬORS 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. M y developer portal ‘ ’ uses XMLHttpRequest to make a request for my APIM service ‘ coolhailey. This blog is in tended to wrap-up the background knowledge and provide a troublesho oting guide for the CORS error in Azure API Management service.Ĭross-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.Īn example in my case, when I try to test one of my API in my APIM developer portal. ' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. optionsSuccessStatus: Provides a status code to use for successful OPTIONS requests, since some legacy browsers (IE11, various SmartTVs) choke on 204.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.preflightContinue: Pass the CORS preflight response to the next handler.Set to an integer to pass the header, otherwise it is omitted. maxAge: Configures the Access-Control-Max-Age CORS header.Set to true to pass the header, otherwise it is omitted. credentials: Configures the Access-Control-Allow-Credentials CORS header.If not specified, no custom headers are exposed. Expects a comma-delimited string (ex: 'Content-Range,X-Content-Range') or an array (ex: ). exposedHeaders: Configures the Access-Control-Expose-Headers CORS header.If not specified, defaults to reflecting the headers specified in the request's Access-Control-Request-Headers header. Expects a comma-delimited string (ex: 'Content-Type,Authorization') or an array (ex: ). allowedHeaders: Configures the Access-Control-Allow-Headers CORS header.Expects a comma-delimited string (ex: 'GET,PUT,POST') or an array (ex: ). methods: Configures the Access-Control-Allow-Methods CORS header.The function takes the request origin as the first parameter and a callback (which expects the signature err, allow ) as the second. Function - set origin to a function implementing some custom logic.For example will accept any request from "" or from a subdomain of "". Array - set origin to an array of valid origins.For example the pattern /example\.com$/ will reflect any request that is coming from an origin ending with "". If it's a match, the request origin will be reflected. RegExp - set origin to a regular expression pattern which will be used to test the request origin.For example if you set it to "" only requests from "" will be allowed. String - set origin to a specific origin.Boolean - set origin to true to reflect the request origin, as defined by req.header('Origin'), or set it to false to disable CORS.origin: Configures the Access-Control-Allow-Origin CORS header.
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