using System;

using System.IO;

using System.Net;

namespace ServiceStack.Text

{

public static class WebRequestExtensions

{

public static string GetJsonFromUrl(this string url, Action<HttpWebResponse> responseFilter = null)

{

return url.GetStringFromUrl("application/json", responseFilter);

}

public static string GetStringFromUrl(this string url, string acceptContentType = "*/*", Action<HttpWebResponse> responseFilter = null)

{

var webReq = (HttpWebRequest)WebRequest.Create(url);

webReq.Accept = acceptContentType;

webReq.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");

webReq.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

using (var webRes = webReq.GetResponse())

using (var stream = webRes.GetResponseStream())

using (var reader = new StreamReader(stream))

{

if (responseFilter != null)

{

responseFilter((HttpWebResponse)webRes);

}

return reader.ReadToEnd();

}

}

public static bool Is404(this Exception ex)

{

return HasStatus(ex as WebException, HttpStatusCode.NotFound);

}

public static HttpStatusCode? GetResponseStatus(this string url)

{

try

{

var webReq = (HttpWebRequest)WebRequest.Create(url);

using (var webRes = webReq.GetResponse())

{

var httpRes = webRes as HttpWebResponse;

return httpRes != null ? httpRes.StatusCode : (HttpStatusCode?)null;

}

}

catch (Exception ex)

{

return ex.GetStatus();

}

}

public static HttpStatusCode? GetStatus(this Exception ex)

{

return GetStatus(ex as WebException);

}

public static HttpStatusCode? GetStatus(this WebException webEx)

{

if (webEx == null) return null;

var httpRes = webEx.Response as HttpWebResponse;

return httpRes != null ? httpRes.StatusCode : (HttpStatusCode?)null;

}

public static bool HasStatus(this WebException webEx, HttpStatusCode statusCode)

{

return GetStatus(webEx) == statusCode;

}

}

}