has been blocked by CORS policy ERR_HTTP2_PROTOCOL_ERROR blocked by CORS Policy Setting up the CORS policy via IIS provides a more flexible way to configure your application if it needs to support another client or the address of the existing one changes. jQuery Hotfixes - Kentico And I would suggest that you install SQL server in mixed mode (both windows authenicatiaon and also sql server auntheication. The fix for me was setting minBytesPerSecond in IIS to 0. But with every app restarting, those states are missing. Adding the same header in web.config file resulting in duplicate entry since the server also adding it and site gets unavailable. So if page was loaded via https then the rdata.csv should also have been requested via https, instead it is requested as http. Access to XMLHttpRequest at from origin has been blocked by CORS policy. version that satisfies the requirement //For GET & POST Add, withCredentials: true as otions Now, comes the explanation to this solution. We identified it from honorable source. Its submitted by dispensation in the best field. Oct 27, 2021 at 18:57. If we have /secure/* path for example. So if page was loaded via https then the rdata.csv should also have been requested via https, instead it is requested as http. How I will unblock my cross-origin request is blocked due to CORS request not http The http request was forbidden with client authentication scheme 'anonymous' Python user input value on http post request CORS Access-Control-Allow-Origin' header You start it up, choose the folder wishing to work with and go to URL (like 127.0.0.1:port you chose) { // // Open an external file (i.e. Right click the site you want to enable CORS for and go to Properties. Only after before send applayed must be able to access it pages in /secure paths