To retrieve gzip compressed data from C#(Mono) in HttpWebRequest.GetResponse

I would like to receive data that is gzip compressed on the server side with Unity's C#(Mono) using the GetResponse() method in HttpWebRequest.

of the following sources: 　using(HttpWebResponse wres=(HttpWebResponse)req.GetResponse())

when you run
　DllNotFoundException:MonoPosixHelper
I am unable to receive a response with the error

According to research, Mono has a GZipStream namespace, but there seems to be no implementation part.
*The reason is that although the compilation goes through, it falls off when I try to use GzipStream, so I think there is only InterFace.

The requestor was able to gzip using Ionic.Zip.CF.dll and send the data to the server, but looking at the stack trace below, the GetResponse() method seems to be designed to call System.IO.Compression.GZipStream, so I don't know how to avoid it.

Development Environment: Windows 7 Unity 5.0.2 f1

● Source Code

string serialized=Json.Serialize(JsonDataDic);
HttpWebRequest request=(HttpWebRequest) WebRequest.Create("API URL");

req.ContentType="application/json; charset=UTF-8";
req.Method="POST";
req.Accept = "application/json";
req.AutomaticDecompression=DecompressionMethods.GZip |DecompressionMethods.Deflate;
req.Headers.Add(HttpRequestHeader.ContentEncoding, "gzip");
byte [] text = Encoding.UTF8.GetBytes(serialized);
byte [ ] compress=Compress(text);
req.ContentLength=compress.Length;
// Configuring Data
vars=req.GetRequestStream();
s.Write(compress,0,compress.Length);
s.Close();

HttpWebResponse wresa=(HttpWebResponse) req.GetResponse();

using(HttpWebResponse wres=(HttpWebResponse)req.GetResponse())
{
    using(Streamst=wres.GetResponseStream())
    {
        using(MemoryStream=newMemoryStream())
        {
            byte [ ] buffer = new byte [4096];
            int count = 0;
            do
            {
                count = st.Read (buffer, 0, buffer.Length);
                memoryStream.Write(buffer,0, count);

            } while(count!=0);
            string str = Encoding.UTF8.GetString(memoryStream.ToArray());

            var deserializedDoubleList=Json.Deserialize(str) as Dictionary<string, object>;;
        }
    }
}

● Stack trace

DllNotFoundException—MonoPosixHelper
System.IO.Compression.DeflateStream..ctor (System.IO.Stream compressedStream, CompressionMode mode, Boolean leaveOpen, Boolean gzip)
(wrapper remoteing-invoke-with-check) System.IO.Compression.DeflateStream:.ctor (System.IO.Stream, System.IO.Compression.CompressionMode, boole, boolean)
System.IO.Compression.GZipStream..ctor (System.IO.Stream compressedStream, CompressionMode mode, Boolean leaveOpen)
System.IO.Compression.GZipStream..ctor (System.IO.Stream compressedStream, CompressionMode mode)
(wrapper remoteing-invoke-with-check) System.IO.Compression.GZipStream:.ctor (System.IO.Stream, System.IO.Compression.CompressionMode)
System.Net.HttpWebResponse..ctor (System.Uriuri, System.String method, System.Net.WebConnectionData, System.Net.CookieContainer container)
(wrapper remoteing-invoke-with-check) System.Net.HttpWebResponse:.ctor (System.Uri, string, System.Net.WebConnectionData, System.Net.CookieContainer)
System.Net.HttpWebRequest.SetResponseData (System.Net.WebConnectionData)
Retrow as WebException: MonoPosixHelper
System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult)
System.Net.HttpWebRequest.GetResponse()

c# unity3d

2022-09-30 20:49

1 Answers

By creating a request not to include Accept-Encoding:gzip, and having the server compress and return it, the API was able to send compressed data and receive compressed data.

^{This post is based on @user3732298's Comment and posted as Community WikiYes,}

^{This post was edited based on Comments by @user3732298 and posted as Community Wiki.}

2022-09-30 20:49

If you have any answers or tips

Popular Tags

python x 4647

android x 1593

java x 1494

javascript x 1427

c x 927

c++ x 878

ruby-on-rails x 696

php x 692

python3 x 685

html x 656