How to assign the values for an HttpRequestMessage class?

Question

I struggle with assigning values to an 'HttpRequestMessage' class. My code is:

let requestMsg = new HttpRequestMessage()
requestMsg.RequestUri = new System.Uri("https://yh-finance.p.rapidapi.com/stock/v2/get-summary?symbol=BMW.DE&region=DE");;

When I assign the URL, I get the response:

val it : bool = false

I tried to assign a different Method but also got the same response.

> requestMsg.Method = HttpMethod.Post;;
val it : bool = false

requestMsg has this content:

> requestMsg;;
val it : HttpRequestMessage =
  Method: GET, RequestUri: '<null>', Version: 1.1, Content: <null>, Headers:
{
}
    {Content = null;
     Headers = seq [];
     Method = GET;
     Options = seq [];
     Properties = seq [];
     RequestUri = null;
     Version = 1.1;
     VersionPolicy = RequestVersionOrLower;}

How can I modify the HttpRequestMessage object?

Answer 1

Assignment in F# is done with <-: https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/values/#mutable-variables

requestMsg.Method <- HttpMethod.Post