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POHttpWebRequest & Native GZip Compression
 

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    <p>When requesting a page with Gzip compression I am getting a lot of the following errors:</p> <blockquote> <p>System.IO.InvalidDataException: The CRC in GZip footer does not match the CRC calculated from the decompressed data</p> </blockquote> <p>I am using native GZipStream to decompress and am looking at addressing this. With that in mind is there a work around for addressing this or another GZip library (free?) which will handle this issue properly?</p> <p>I am verifying the webResponse ContentEncoding is GZIP</p> <p><strong>Update 5/11</strong> A simplified snippit</p> <pre><code>//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; } </code></pre>
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    1. COIs it for a specific site, or is this happening from responses everywhere? If its only one site, it could be that the problem lies on the other side.
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    2. CONote also that "deflate", according to the HTTP spec, is really "zlib" (which wraps deflate), and not deflate at all (it's a misnomer). Because of [this confusion](http://en.wikipedia.org/wiki/Gzip#Derivatives_and_other_uses), though, some servers will send deflate, and other zlib, and clients need to support both (by heuristic guess) just in case. Yuck.
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