RequestMain.csx

using System.Net.Http;
using System.Net.Http.Headers;
using Newtonsoft.Json;
using System.Collections.Generic;

public string Get(string url, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null)
{
    var httpClient = new HttpClient();
    SetOptionalHeaders(httpClient, authenticationHeaderValue, customHeaders);
    return httpClient.GetStringAsync(url).Result;
}

public HttpResponseMessage GetJson(string url, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null)
{
    var httpClient = new HttpClient();
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    SetOptionalHeaders(httpClient, authenticationHeaderValue, customHeaders);
    return httpClient.GetAsync(url).Result;
}

public T GetJson<T>(string url, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null) where T : class
{
    var result = GetJson(url, authenticationHeaderValue, customHeaders);
    return JsonConvert.DeserializeObject<T>(result.Content.ReadAsStringAsync().Result);
}

public HttpResponseMessage PostJson<T>(string url, T objectToPost, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null) where T : class
{
    var httpClient = new HttpClient();
    var bodyContent = new StringContent(JsonConvert.SerializeObject(objectToPost), Encoding.UTF8, "application/json");
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    SetOptionalHeaders(httpClient, authenticationHeaderValue, customHeaders);
    return httpClient.PostAsync(url, bodyContent).Result;
}

public HttpResponseMessage PutJson<T>(string url, T objectToPut, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null) where T : class
{
    var httpClient = new HttpClient();
    var bodyContent = new StringContent(JsonConvert.SerializeObject(objectToPut), Encoding.UTF8, "application/json");
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    SetOptionalHeaders(httpClient, authenticationHeaderValue, customHeaders);
    return httpClient.PutAsync(url, bodyContent).Result;
}

public HttpResponseMessage Delete(string url, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null)
{
    var httpClient = new HttpClient();
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    SetOptionalHeaders(httpClient, authenticationHeaderValue, customHeaders);
    return httpClient.DeleteAsync(url).Result;
}

private void SetOptionalHeaders(HttpClient httpClient, AuthenticationHeaderValue authenticationHeaderValue = null, Dictionary<string, string> customHeaders = null)
{
    if (authenticationHeaderValue != null)
    {
        httpClient.DefaultRequestHeaders.Authorization = authenticationHeaderValue;
    }

    if (customHeaders != null)
    {
        foreach (var customHeader in customHeaders)
        {
            httpClient.DefaultRequestHeaders.Add(customHeader.Key, customHeader.Value);
        }
    }
}