HttpClient请求浏览器

Question

当我通过HttpClient类调用网站www.livescore.com时,我总是得到错误"500".可能是来自HttpClients的服务器阻止请求.

1)还有其他方法可以从网页上获取HTML吗？

2)如何设置标题以获取HTML内容？

当我在浏览器中设置标题时,我总是得到stange编码的内容.

    http_client.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "text/html,application/xhtml+xml,application/xml");
    http_client.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate");
    http_client.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0");
    http_client.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Charset", "ISO-8859-1");

3)我如何解决这个问题？有什么建议？

我在C#和HttpClientClass中使用Windows 8 Metro Style App

Answer 1

在这里 - 你注意你必须解压缩你回来的gzip编码结果:按照 mleroy:

private static readonly HttpClient _HttpClient = new HttpClient();

private static async Task<string> GetResponse(string url)
{
    using (var request = new HttpRequestMessage(HttpMethod.Get, new Uri(url)))
    {
        request.Headers.TryAddWithoutValidation("Accept", "text/html,application/xhtml+xml,application/xml");
        request.Headers.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate");
        request.Headers.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0");
        request.Headers.TryAddWithoutValidation("Accept-Charset", "ISO-8859-1");

        using (var response = await _HttpClient.SendAsync(request).ConfigureAwait(false))
        {
            response.EnsureSuccessStatusCode();
            using (var responseStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
            using (var decompressedStream = new GZipStream(responseStream, CompressionMode.Decompress))
            using (var streamReader = new StreamReader(decompressedStream))
            {
                return await streamReader.ReadToEndAsync().ConfigureAwait(false);
            }
        }
    }
}

这样称呼:

var response = await GetResponse("http://www.livescore.com/").ConfigureAwait(false); // or var response = GetResponse("http://www.livescore.com/").Result;

Answer 2

也可以尝试这个来添加压缩支持:

var compressclient = new HttpClient(new HttpClientHandler() 
{ 
AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip 
}); 

这也添加了标题.

根据相同的线程支持现在在Windows Store框架中:http://social.msdn.microsoft.com/Forums/windowsapps/en-US/429bb65c-5f6b-42e0-840b-1f1ea3626a42/httpclient-data-compression-and -caching？教授=所需

Answer 3

有几件事要注意。

1. 该站点要求您提供用户代理，否则会返回 500 HTTP 错误。

2. 对 livecore.com 的 GET 请求以 302 响应到 livecore.us。您需要处理重定向或直接请求 livecore.us

3. 您需要解压缩 gzip 压缩的响应

此代码使用 .NET 4 Client Profile 工作，我会让您确定它是否适合 Windows Store 应用程序。

var request = (HttpWebRequest)HttpWebRequest.Create("http://www.livescore.com");
request.AllowAutoRedirect = true;
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17";

string content;

using (var response = (HttpWebResponse)request.GetResponse())
using (var decompressedStream = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress))
using (var streamReader = new StreamReader(decompressedStream))
{
    content = streamReader.ReadToEnd();
}