Unsupported media type error with application/json specified

Question

I am trying to access a public API with a POST Method and with the following JSON body:

 {

              "params": {
                  "companyId":"620e91a211b42421733aa2b4"
            },
        "id": "620e91a211b42421733aa2b4",
        "jsonrpc": "2.0",    "method": "getLicenseInfo"
    
       }

Which correctly returns the expected values in Postman. Unfortunately I have a problem while sending the request via a C# asp.net application since after using the following code:

               HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, GlobalFunctions.GetBitDefenderBaseURL() + "/licensing");

                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                request.Headers.Add("cache-control", "no-cache");
                request.Headers.Add("Connection", "keep-alive");
                request.Headers.Add("user-agent", "ReservedArea/1.0");
                string base64Token = System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(GlobalFunctions.GetBitDefenderAPIKey() + ":"));
                request.Headers.Add("Authorization","Basic " + base64Token );


                string json = "{\"params\": {" +
                        "\"companyId\":\"" + bitDefenderCompanyId + "\"}," +
                        "\"id\": \"" + bitDefenderCompanyId + "\"," +
                        "\"jsonrpc\": \"2.0\"," +
                        "\"method\": \"getLicenseInfo\"}";

                        var httpContent = new System.Net.Http.StringContent(json, Encoding.UTF8, "application/json");

                        request.Content = httpContent;
    
                        HttpResponseMessage response = await client.SendAsync(request).ConfigureAwait(false);

I get an "Usupported media type error".

As far as I understood I am correctly specifying the request content-type correctly while creating the StringContent object, but I am having no luck in getting a correct response from the API I am trying to contact.

Many thanks to anyone who is eager to help me.

There are other overloads on http client like PostJsonAsync. Could you give that a try. It is much simpler and requires less code, which is always better. — L01NL
– L01NL, Commented Nov 14, 2022 at 7:47
Do you mind to record the request with a tool like Fidller so we can see what the raw request looks like? — L01NL
– L01NL, Commented Nov 15, 2022 at 7:58

Ramp2010 · Accepted Answer · 2022-11-14 17:10:42Z

0

Try removing the slashes and double quotes.

            string json = "{'params': {" +
                       "'companyId':'" + bitDefenderCompanyId + "'}," +
                       "'id': '" + bitDefenderCompanyId + "'," +
                       "'jsonrpc': '2.0'," +
                       "'method': 'getLicenseInfo'}";

answered Nov 14, 2022 at 17:10

Ramp2010

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3 Comments

ilsologheo00 Over a year ago

Done, but still I've got the same error

Ramp2010 Over a year ago

Try using Newtonsoft to convert to httpcontent and send. See if that works.

var jsonConverted = JsonConvert.SerializeObject(json,  Formatting.Indented);       var httpContent2 = new StringContent(jsonConverted);

ilsologheo00 Over a year ago

Already used Newtosoft, but sill I got the unsupported media

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