Hi,ExceedingLife

ExceedingLife

I tried with HttpPut and HttpPost but nether called my API method.

• Make sure the port is correct and it can find the action correctly.

HttpRequestMessage httpRequest = new HttpRequestMessage(HttpMethod.Post, $"https://localhost:44306/account/UpdateUser/");

• I tested these code without the 'gateway' and they works well, so the problem may lies on it, you should check whether your gateway can work well

ExceedingLife

I get a 400 bad request and 404 not found.

Could you please tell us about their scenes?

• 400 bad request  often caused by the bad request, means the request can not access the action.
• 404 error often means can not find the url.

You can set break point to check whether you have these mistakes.

Best Regards,

Jerry Cai