gzip HttpWebRequest

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I am submitting HTTP POST requests via HttpWebRequest which contain a large amount of content. I would like to gzip the message content. Is this possible?

Does IIS 7 have to be configured to handle the compressed content? It has already been configured to serve compressed responses.

I've tried adding a Content-Encoding = gzip header and writing to the request stream wrapped in a GZipStream but the server returns a 504 (GatewayTimeout) which seems odd.

The vast majority of web servers do not support compressed request bodies. mod_deflate can be configured to support it on Apache but seldom actually is (as a zip-bomb is an easy potential DoS attack). I'm not aware of an IIS solution.

If you are talking back to your own server there is of course nothing stopping you doing the compression at the application level. If you have to pass a standard form type for the backend to read, you should pick multipart/form-data, as URL-encoding would bloat the binary data of the compressed content parameter.

.NET: Is it possible to get HttpWebRequest to automatically , What about the webrequest AutomaticDecompression Property available since . net 2? Simply add: webRequest.AutomaticDecompression� Compress folder with Gzip Using gzip for compression in .htaccess How do I send a POST request with a body that is a string or a character using httpwebrequest?

I don't believe IIS7 supports GZIP requests, out of the box. Here's why. On my IIS7 machine, gzip.dll does not export decompression methods.

c:\Windows\System32\inetsrv>c:\vc9\bin\dumpbin.exe  -exports gzip.dll
Microsoft (R) COFF/PE Dumper Version 9.00.30729.01
Copyright (C) Microsoft Corporation.  All rights reserved.

Dump of file gzip.dll

File Type: DLL

  Section contains the following exports for gzip.dll

    00000000 characteristics
    47919400 time date stamp Sat Jan 19 01:09:04 2008
        0.00 version
           1 ordinal base
           6 number of functions
           6 number of names

    ordinal hint RVA      name

          1    0 0000242D Compress
          2    1 00002E13 CreateCompression
          3    2 000065AE DeInitCompression
          4    3 000012EE DestroyCompression
          5    4 0000658D InitCompression
          6    5 000065B6 ResetCompression


        1000 .data
        1000 .reloc
        1000 .rsrc
        6000 .text

I think this represents a change in gzip.dll. I believe in prior versions of gzip.dll, there were 12 exported methods, including 6 that did Decompression.

HttpWebRequest & Native GZip Compression, Create the HttpWebRequest object to which we will delegate all work after compressing the request data. public GZipHttpWebRequest(Uri uri). {. this. request = (� This takes care of the server side and if you're using a browser, GZip support is pretty much automatic - it just works as most browsers can decompress Gzip content. But if you're using an HTTP client in the .NET framework - WebClient or HttpWebRequest - you'll find that Gzip is not natively supported.

I got the same error.

Solved by adding executionTimeout to web.config:

<httpRuntime maxRequestLength="1048576" executionTimeout="300" />

ExecutionTimeout- is on seconds...

gzip C#/.NET GZipHttpWebRequest.cs, I tried to make HttpWebRequeset object with gzip-compressed request stream as follow. Hide Expand Copy Code. HttpWebRequest request� Dim wrq As WebRequest Dim wrp As HttpWebResponse = Nothing wrq = WebRequest.Create(url) wrp = DirectCast(wrq.GetResponse(), HttpWebResponse) Dim sr As New StreamReader(wrp.GetResponseStream) Dim Text2Return As String = sr.ReadToEnd() What I need to do is to modify this to accomodate the occasional pages with ContentEncoding="gzip".

How do I make gzip compressed request with HttpWebRequest , See this page for a synopsis of how GZip works with web requests in general. The specific header you're going to need to send is Accept-Encoding: gzip. Normally, you'd need to add this to the request yourself (via the Headers collection), but there's a shortcut. Per this answer, all you need to do is add

I have a large amount of data (~100k) that my C# app is sending to my Apache server with mod_gzip installed. I'm attempting to gzip the data first using System.IO.Compression.GZipStream.

Use the HttpWebRequest.AutomaticDecompression property as follows: HttpWebRequest hwr = (HttpWebRequest) WebRequest.Create(url); hwr.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; It's not necessary to manually add the Accept-Encoding HTTP header; it will automatically be added when that property is used.