[Mono-bugs] [Bug 523418] New: GZipStream used as Filter for HttpResponse produces invalid gzip

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http://bugzilla.novell.com/show_bug.cgi?id=523418


           Summary: GZipStream used as Filter for HttpResponse produces
                    invalid gzip
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: s.volchkov at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=306057)
 --> (http://bugzilla.novell.com/attachment.cgi?id=306057)
archive with sources and compiled binaries of primitive Web application

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.11)
Gecko/2009060215 Firefox/3.0.11 (.NET CLR 4.0.20506)

In an ASP.NET application, the following code:

Response.AppendHeader("Content-Encoding", "gzip");
Response.Filter = new GZipStream(Response.Filter, CompressionMode.Compress);

should produce a page compressed with gzip. Under Microsoft.NET (2.0 and 3.5)
this works fine, but under Mono and xsp the resulting HTML response body is
smaller and cannot be decompressed using Linux gzip.

This was tested on Mono 2.4.2
(http://anonsvn.mono-project.com/source/tags/mono-2-4-2/mono), running on
Debian Linux (lenny release).

Reproducible: Always

Steps to Reproduce:
1. Unpack attached archive, go to 'published' subfolder (which is a result of
applying Publish command in Visual Studio to source project, located in 'src'
archive subfolder).
2. Start xsp (I used the following command line: MONO_OPTIONS=--debug xsp2
--verbose)
3. Download http://127.0.0.1:8080/Default.aspx, e.g. using: wget -d
http://127.0.0.1:8080/Default.aspx
Actual Results:  
Trying to determine the type of the saved file using 'file Default.aspx'
produces output:
Default.aspx: data

Trying to decompress the file using 'gunzip -c Default.aspx' produces output:
gzip: Default.aspx: not in gzip format

The saved file under Mono has a size of 253 bytes.

Expected Results:  
Trying to determine the type of the saved file using 'file Default.aspx'
produces output:
Default.aspx: gzip compressed data, from FAT filesystem (MS-DOS, OS/2, NT), max
speed

Trying to decompress the file using 'gunzip -c Default.aspx' produces valid
HTML (350 bytes).

The saved file under Microsoft.NET has a size of 348 bytes.

The issue has been previously reported for Mono 2.2:
http://www.mail-archive.com/mono-list@lists.ximian.com/msg29100.html.

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