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c# - RestSharp ignoring system proxy (for example Fiddler) on .NET Core

I want check the http traffic with Fiddler, but no any http traffic captured, my testing codes:

private static void ByRestSharp()
{
    var restClient = new RestClient("https://jsonplaceholder.typicode.com");
    var request = new RestRequest("posts", Method.GET);
    var response = restClient.Get<List<Post>>(request);
    Console.WriteLine("{0} posts return by RestSharp.", response.Data.Count);
}

But after I changed to use HttpClient, Fiddler can capture the http traffic, sample codes:

private static void ByHttpClient()
{
    var httpClient = new HttpClient();
    using (var req = new HttpRequestMessage(HttpMethod.Get, "https://jsonplaceholder.typicode.com/posts"))
    using (var resp = httpClient.SendAsync(req).Result)
    {
        var json = resp.Content.ReadAsStringAsync().Result;
        var users = SimpleJson.SimpleJson.DeserializeObject<List<Post>>(json);
        Console.WriteLine("{0} posts return by HttpClient.", users.Count);
    }
}

Is this a issue of RestSharp or Fiddler?

See Question&Answers more detail:os

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RestSharp supported system proxy until we moved to .NET Standard. Then, we got issues with proxy on .NET Core and then using the system proxy was removed entirely. We have an issue opened on Github and you can check the progress there.

However, explicitly setting the proxy should work for full .NET Framework, check this issue.

Code from the issue, which is confirmed to be working:

var client = new RestClient("http://www.google.com");
client.Proxy = new WebProxy("127.0.0.1", 8888);
var req = new RestRequest("/", Method.GET);
var resp = client.Execute(req);

Update 2018-05-31: RestSharp 106.3 is using the default proxy on .NET Core also, automatically. Tested with Fiddler.


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