HttpWebRequest和本机GZip压缩
HttpWebRequest和本机GZip压缩
提问于 2009-05-08 13:55:18
当请求一个带有Gzip压缩的页面时，我得到了很多下面的错误：
System.IO.InvalidDataException: GZip页脚中的CRC与从解压缩数据计算出的CRC不匹配
我正在使用原生GZipStream解压，并正在考虑解决这个问题。考虑到这一点，有没有办法解决这个或另一个GZip库(免费？)哪个会正确地处理这个问题？
我正在验证webResponse ContentEncoding是否为GZIP
更新5/11 A简化代码片段
//Caller
public void SOSampleGet(string url)
{
// Initialize the WebRequest.
webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.Method = WebRequestMethods.Http.Get;
webRequest.KeepAlive = true;
webRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
webRequest.Headers.Add("Accept-Encoding", "gzip,deflate");
webRequest.Referer = WebUtil.GetDomain(url);
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
using (Stream stream = GetStreamForResponse(webResponse, READTIMEOUT_CONST))
{
//use stream
}
}
//Method
private static Stream GetStreamForResponse(HttpWebResponse webResponse, int readTimeOut)
{
Stream stream;
switch (webResponse.ContentEncoding.ToUpperInvariant())
{
case "GZIP":
stream = new GZipStream(webResponse.GetResponseStream(), CompressionMode.Decompress);
break;
case "DEFLATE":
stream = new DeflateStream(webResponse.GetResponseStream(), CompressionMode.Decompress);
break;
default:
stream = webResponse.GetResponseStream();
stream.ReadTimeout = readTimeOut;
break;
}
return stream;
}回答 6
Stack Overflow用户
发布于 2011-10-15 09:38:32
从.net 2开始提供的webrequest AutomaticDecompression属性怎么样？只需添加：
webRequest.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;它还将gzip、deflate添加到accept编码头。
请参阅http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.automaticdecompression.aspx
Stack Overflow用户
发布于 2017-06-13 05:08:32
对于.NET来说，核心的事情要稍微复杂一些。由于AutomaticCompression没有属性(在编写时)，因此需要一个GZipStream。在这里看我的答案：https://stackoverflow.com/a/44508724/2421277
答案中的代码：
var req = WebRequest.CreateHttp(uri);
/*
* Headers
*/
req.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate";
/*
* Execute
*/
try
{
using (var resp = await req.GetResponseAsync())
{
using (var str = resp.GetResponseStream())
using (var gsr = new GZipStream(str, CompressionMode.Decompress))
using (var sr = new StreamReader(gsr))
{
string s = await sr.ReadToEndAsync();
}
}
}
catch (WebException ex)
{
using (HttpWebResponse response = (HttpWebResponse)ex.Response)
{
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
string respStr = sr.ReadToEnd();
int statusCode = (int)response.StatusCode;
string errorMsh = $"Request ({url}) failed ({statusCode}) on, with error: {respStr}";
}
}
}Stack Overflow用户
发布于 2009-05-08 14:58:44
您是否正在冲刷并关闭流？尝试使用Using语句包装您的GZipStream。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/839888
复制相关文章
相似问题