The 'Accept' header must be modified using the appropriate property or method. Parameter name: name

Question

Getting error message - The 'Accept' header must be modified using the appropriate property or method. i'm getting the response in the post man but not getting in the MVC controller i have one basic authentication api with below headers.while using adding accept headers in the request getting the error

Content-Type:  application/vnd.onem2m-res+json;ty=4;
Accept: application/vnd.onem2m-res+json;
Cache-Control: no-cache
X-M2M-RI: 9900001
Authorization: Basic QzdBQUNFO
X-M2M-Origin: C7AACE9-25

code

WebRequest req = WebRequest.Create(@"url");
                req.Method = "GET";
                req.Headers["Authorization"] = "Basic " + "QzdBQUNFO";
                req.ContentType = "application/vnd.onem2m-res+json";
                req.Headers.Add("Accept", "application/vnd.onem2m-res+json;");
                req.Headers["Cache-Control"] = "no-cache";
                req.Headers["X-M2M-RI"] = "9900001";
                req.Headers["X-M2M-Origin"] = "C7AACE9-25";
                HttpWebResponse resp = req.GetResponse() as HttpWebResponse;
                var encoding = resp.CharacterSet == "" ? Encoding.UTF8 : Encoding.GetEncoding(resp.CharacterSet);

Answer 1

WebRequest req = WebRequest.Create(@"url");
            req.Method = "GET";
            req.Headers["Authorization"] = "Basic " + "QzdBQUNFO";
            req.ContentType = "application/vnd.onem2m-res+json";
            req.Accept = "application/vnd.onem2m-res+json";
            req.Headers["Cache-Control"] = "no-cache";
            req.Headers["X-M2M-RI"] = "9900001";
            req.Headers["X-M2M-Origin"] = "C7AACE9-25";
            HttpWebResponse resp = req.GetResponse() as HttpWebResponse;
            var encoding = resp.CharacterSet == "" ? Encoding.UTF8 : Encoding.GetEncoding(resp.CharacterSet);

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