If I'm working on real Website or react native application why isn't safe ?įor this warning, I think it just reminds us the localhost url should only used to test the application on the local environment for the real website, you need to change the localhost url to the real url. WithOrigins(" should only be used for testing a sample More detail information, see Enable CORS with attributes and Disable CORS.Īnd there is warning about changing the origin. Then, when using attribute: The attribute does not disable CORS that has been enabled by endpoint routing. ![]() The attribute and attribute can be used to enable/disable CORS and applying a named policy to only those endpoints that require/not required CORS provides the finest control.įor the finest control of limiting CORS requests: Should I stay on EnableCors or DisableCors ? Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. If you have extra questions about this answer, please click "Comment". ![]() If the answer is the right solution, please click "Accept Answer" and kindly upvote it. More detail information, see Enable Cross-Origin Requests (CORS) in ASP.NET Core. Policy.WithOrigins(" "") // add the allowed origins Options.AddPolicy(name: MyAllowSpecificOrigins, Var builder = WebApplication.CreateBuilder(args) Try to remove it.įor this issue, you need to configure the API application to allow the origin Code like this: var MyAllowSpecificOrigins = "_myAllowSpecificOrigins" Will be glad to understand what should I do and why these doesn't work. I know this has been asked many times before in the web, but I tried and read many things, some just ruin the project in React - I had to delete files and reinstall, besides that nothing helped. When mode: 'no-cors' I get only this error -īundle.js:47575 Synta圎rror: Unexpected end of input (at bundle.js:898:18) If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. So I tried to enable then to disable CORS and to Enable CORS in my project with the explanations in docs -īut nothing does it, in chrome I get the same error (except when I change mode to 'no-cors')**Īccess to fetch at ' from origin ' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. I'll appreciate any help provided.I understand what's Cross-Origin Requests error I'm getting and why it is important. I checked the Internet for days hoping to find a similar problem with no avail. Note: null should not be used: 'It may seem safe to return Access-Control-Allow-Origin: 'null', but the serialization of the Origin of any resource that uses a non-hierarchical scheme (such as data: or file:) and sandboxed documents is defined to be 'null'. On the API Gateway console I verified that OPTIONS method response was set correctly to provide HTTP status: 200. ![]() I ran a CORS check on the OPTIONS request, verified that the CORS headers enabled on the API Gateway were present in the response, including Access-Control-Allow-Origin was set to '*'. X-Amzn-Errortype: MissingAuthenticationTokenException Investigation ![]() The network tab shows OPTIONS status code as 403 to preflight request. The debugger's console prints an error as follows:Īccess to fetch at ' from origin ' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status. However the preflight OPTIONS request now has error 403 Forbidden error. Under the covers there is a preflight OPTIONS request which should normally return 200 ok, then the POST request follows that. When the user attempts to login, this makes a POST request with login credentials via js fetch API. It is possible that I may have missed a step, but I am not sure what. This could have contributed to the problem I am seeing. I had to wipe off the CloudFront stack (including all resources) and deploy everything from scratch. I started to use ACLs, and made sure all website resources have list and read permissions. Recently I have made a deployment which failed for a reason related to this AWS change: Advanced Notice: Amazon S3 will automatically enable S3 Block Public Access and disable access control lists for all new buckets starting in April 2023Īs a result I had to make permissions changes on the S3 bucket that hosted the website.
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