Set 'Content-Type' header using RestSharp

Question

I'm building a client for an RSS reading service. I'm using the RestSharp library to interact with their API.

The API states:

When creating or updating a record you must set application/json; charset=utf-8 as the Content-Type header.

This is what my code looks like:

RestRequest request = new RestRequest("/v2/starred_entries.json", Method.POST);
request.AddHeader("Content-Type", "application/json; charset=utf-8");
request.RequestFormat = DataFormat.Json;
request.AddParameter("starred_entries", id);

//Pass the request to the RestSharp client
Messagebox.Show(rest.ExecuteAsPost(request, "POST").Content);

However; the service is returning "Error 415: Please use the 'Content-Type: application/json; charset=utf-8' header." Why isn't RestSharp passing the header?

Answer 1

The solution provided on my blog is not tested beyond version 1.02 of RestSharp. If you submit a comment on my answer with your specific issue with my solution, I can update it.

var client = new RestClient("http://www.example.com/where/else?key=value");
var request = new RestRequest();

request.Method = Method.POST;
request.AddHeader("Accept", "application/json");
request.Parameters.Clear();
request.AddParameter("application/json", strJSONContent, ParameterType.RequestBody);

var response = client.Execute(request);

Answer 2

In version 105.2.3.0 I can solve the problem this way:

var client = new RestClient("https://www.example.com");
var request = new RestRequest("api/v1/records", Method.POST);
request.AddJsonBody(new { id = 1, name = "record 1" });
var response = client.Execute(request);

Old question but still top of my search - adding for completeness.

Answer 3

Although this is a bit old: I ran into the same problem.. seems some attributes such as "content-type" or "date" cannot be added as parameter but are added internally. To alter the value of "content-type" I had to change the serialzer setting (altough I didn`t use it because I added a json in the body that was serialized before!)

RestClient client = new RestClient(requURI);
RestRequest request = new RestRequest(reqPath, method);
request.JsonSerializer.ContentType = "application/json; charset=utf-8";

as soon as I did this the header showed up as intended:

 System.Net Information: 0 : [5620] ConnectStream#61150033 -   Header 
 {
  Accept: application/json, application/xml, text/json, text/x-json, text/javascript, text/xml
  User-Agent: RestSharp 104.1.0.0
  Content-Type: application/json; charset=utf-8
  ...
 }

Answer 4

You most probably run into this problem: https://github.com/restsharp/restsharp/issues/221 There is a working solution to your problem @ http://itanex.blogspot.co.at/2012/02/restsharp-and-advanced-post-requests.html

Answer 5

request.XmlSerializer = new DotNetXmlSerializer();
            request.Parameters.Clear();
            request.AddParameter(new Parameter()
            {
                ContentType = "application/xml",
                Name = "application/xml",
                Type = ParameterType.RequestBody,
                Value = request.XmlSerializer.Serialize(deleteUserQuery.UserDelRqHeader)
            });
            request.AddHeader("Accept", "application/xml");

Answer 6

Here is the solution

http://restsharp.blogspot.ca/

Create a json object with same name properties and set the values (Make sure they are similar to those of name value pair for post request.)

After that use default httpclient.