During the preflight request, you should see the following two headers: Access-Control-Request-Method and Access-Control-Request-Headers. These request headers are asking the server for permissions to make the actual request. Your preflight response needs to acknowledge these headers in order for the actual request to work. For example, suppose the browser makes a request with the following … Read more
Access to Opaque Responses’ Headers / Body The most straightforward limitation around opaque responses is that you cannot get meaningful information back from most of the properties of the Response class, like headers, or call the various methods that make up the Body interface, like json() or text(). This is in keeping with the black-box … Read more
Simple Server-Side Fix ❗ DO NOT USE “socketio” package… use “socket.io” instead. “socketio” is out of date. Some users seem to be using the wrong package. ❗ SECURITY WARNING: Setting origin * opens up the ability for phishing sites to imitate the look and feel of your site and then have it work just the … Read more
Javascript is limited when making ajax requests outside of the current domain. Ex 1: your domain is example.com and you want to make a request to test.com => you cannot. Ex 2: your domain is example.com and you want to make a request to inner.example.com => you cannot. Ex 3: your domain is example.com:80 and … Read more
Usually, all you need to do is to “Add CORS Configuration” in your bucket properties. The <CORSConfiguration> comes with some default values. That’s all I needed to solve your problem. Just click “Save” and try again to see if it worked. If it doesn’t, you could also try the code below (from alxrb answer) which … Read more
If an opaque response serves your needs It doesn’t. You want to see the response. You can’t see an opaque response (that is what opaque response means). no-cors mode means that if the browser has to do anything that requires permission from CORS, it will fail silently instead of throwing an error. So it is … Read more
Because you have a very simple CORS policy (Allow all requests from XXX domain), you don’t need to make it so complicated. Try doing the following first (A very basic implementation of CORS). If you haven’t already, install the CORS nuget package. Install-Package Microsoft.AspNetCore.Cors In the ConfigureServices method of your startup.cs, add the CORS services. … Read more
An HTTP 5xx error indicates some failure on the server side. Or it can even indicate the server just isn’t responding at all — e.g., a case might be, your backend tries to proxy a request to a server on another port, but the server is not even be up and listening on the expected … Read more
Use addHeader Instead of using setHeader method, response.addHeader(“Access-Control-Allow-Origin”, “*”); * in above line will allow access to all domains. For allowing access to specific domain only: response.addHeader(“Access-Control-Allow-Origin”, “http://www.example.com”); Check this blog post.
When you start playing around with custom request headers you will get a CORS preflight. This is a request that uses the HTTP OPTIONS verb and includes several headers, one of which being Access-Control-Request-Headers listing the headers the client wants to include in the request. You need to reply to that CORS preflight with the … Read more