API Get requires Content-Type application/json;charset=UTF-8 - Issue with Http Client

Question

I am working with an API service that requires Content-Type to be set to application/json;charset=UTF-8.

If I make a request without the charset=UTF-8 I get a 406 - Not Acceptable.

I can make a call through Postman setting the Content-Type as required, but if I use my .Net Http Client I get the error:

System.FormatException: 'The format of value 'application/json;charset=UTF-8' is invalid.'

Is there anyway I can work around this validation and force the Http Client to accept the value?

UPDATE:

Here is my latest attempt,it still throws the error.

Body.Headers.ContentType = new MediaTypeHeaderValue("application/json;charset=UTF-8");

UPDATE: Content-Type is indeed an invalid header. The API Developers removed it at our request.

Solution 1

Try to set the property:

 new MediaTypeHeaderValue("application/json")
        {
            CharSet = Encoding.UTF8.WebName
        }; 

Solution 2

Try this one

HttpClient httpClient= new HttpClient();
httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json; charset=utf-8");

Comments

[Lee Ames]

I did try this one, it returns false, indicating that it did not add the header. Also when I examine the client object I can see that it was not added to the list of headers. But thanks for the suggestion.

[Roman Marusyk]

The OP says that "a request without the charset=UTF-8 I get a 406 - Not Acceptable."

[Lee Ames]

I got the same validation error as before. But I do appreciate the suggestion!

[Roman Marusyk]

@Neo yes, for me, in old asp.net (not Core). what problem do you have with it?

[Epicycle]

Probably better do a client.DefaultRequestHeaders.Accept.Clear() before but other than that this should be the accepted answer. Edit: Nevermind op is talking about the content-type not the accept header.