![]() Ionic apps may be run from different origins, but only one origin can be specified in the Access-Control-Allow-Origin header. The correct and easiest solution is to enable CORS by returning the right response headers from the web server or backend and responding to preflight requests, as it allows to keep using XMLHttpRequest, fetch, or abstractions like HttpClient in Angular. Used to let the server know what non-simple headers will be used when the actual request is made. Used to let the server know what method will be used when the actual request is made. Please note that the headers below are for reference only, and should not be set in your app code (the browser will ignore them). The browser automatically sends the appropriate headers for CORS in every request to the server, including the preflight requests. Indicates how long the results of a preflight request can be cached. Specifies the headers that the browser is allowed to access. Whether or not the request can be made with credentials. Used in response to a preflight request to indicate which headers can be used when making the actual request, aside from the simple headers, which are always allowed. ![]() Which methods are allowed when accessing the resource: GET, HEAD, POST, PUT, DELETE, CONNECT, OPTIONS, TRACE, PATCH. Specifies the origin to be allowed, like or * to allow all origins. CORS Headers Server Headers (Response) ![]() In our example API, GET requests don't need to be preflighted because no JSON data is being sent, and so the app doesn't need to use the Content-Type: application/json header.
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