CODEWITHSUNDEEP
c#xml-parsinggzipwebclienthttprequest
ozgun
ozgun

Reputation: 263

Can't read XML data

I want to read xml file from remote server but somehow the server doesn't response to my request. Therefore, Gzip throws "The magic number in GZip header is not correct" exception. Any idea? 

 private static string GetFile()
    {
        Uri uri = new Uri(@"http://www.iddaa.com.tr/XML/IDDAAMACPROGRAMI/index.htm?iddaadrawid=12.09.2012&iddaadrawide=13.09.2012&foraccess=KSsec654");

        string xmlFile;

        HttpWebRequest req = (HttpWebRequest) HttpWebRequest.Create(uri);
        req.UserAgent =
            "MOZILLA/5.0 (WINDOWS NT 6.1; WOW64) APPLEWEBKIT/537.1 (KHTML, LIKE GECKO) CHROME/21.0.1180.75 SAFARI/537.1";
        req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
        req.Headers.Add("Accept-Encoding", "gzip,deflate");


        using (GZipStream zip = new GZipStream(req.GetResponse().GetResponseStream(),
                                               CompressionMode.Decompress))
        {
            var reader = new StreamReader(zip);
            xmlFile = reader.ReadToEnd();
        }

        return xmlFile;
    }

Upvotes: 0

Views: 2033

Answers (1)

Darin Dimitrov
Darin Dimitrov

Reputation: 1038780

You don't need to use gzip. The HttpWebRequest will automatically do this for you if the server sends gzip header to the response.

But you could even further simplify your code using a WebClient:

private static string GetFile()
{
    using (var client = new WebClient())
    {
        client.Headers[HttpRequestHeader.UserAgent] = "MOZILLA/5.0 (WINDOWS NT 6.1; WOW64) APPLEWEBKIT/537.1 (KHTML, LIKE GECKO) CHROME/21.0.1180.75 SAFARI/537.1";
        client.Headers[HttpRequestHeader.Accept] = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
        client.Headers[HttpRequestHeader.AcceptEncoding] = "gzip,deflate";
        var xmlFile = client.DownloadString("http://www.iddaa.com.tr/XML/IDDAAMACPROGRAMI/index.htm?iddaadrawid=12.09.2012&iddaadrawide=13.09.2012&foraccess=KSsec654");
        return xmlFile;
    }
}

or the new HttpClient class that was introduced in .NET 4.5:

private async Task<string> GetFile()
{
    using (var client = new HttpClient() { BaseAddress = new Uri("http://www.iddaa.com.tr") })
    {
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("MOZILLA", "5.0"));
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("(WINDOWS NT 6.1; WOW64)"));
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("APPLEWEBKIT", "537.1"));
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("(KHTML, LIKE GECKO)"));
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("CHROME", "21.0.1180.75"));
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("SAFARI", "537.1"));

        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/html"));
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xhtml+xml"));
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml", 0.9));
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*", 0.8));

        client.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("gzip"));
        client.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("deflate"));
        var result = await client.GetAsync("/XML/IDDAAMACPROGRAMI/index.htm?iddaadrawid=12.09.2012&iddaadrawide=13.09.2012&foraccess=KSsec654");
        result.EnsureSuccessStatusCode();
        return await result.Content.ReadAsStringAsync();
    }
}

Upvotes: 5

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