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POIIS Compression For WebService Returning a Large String Value
 

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    <p>I have a web service returning an XML value in a String format.</p> <p>Through IE9, I can see that some of the size for the web service calls go as high as 1MB.</p> <p>I enabled compression in IIS 6 by editing the Metabase.xml file, setting the following:</p> <pre><code>HcScriptFileExtensions = "asmx" </code></pre> <p>under the </p> <pre><code>IIsCompressionScheme Location ="/LM/W3SVC/Filters/Compression/gzip" </code></pre> <p>I have also enabled HTTP Compression on the Service tab for the Web Sites properties in IIS Manager.</p> <p>I have also added the HttCompression in the web service extensions, mapping to the gzip dll on the Windows\System32\inetsrv\ folder.</p> <p>When I make the call to the web service, the value being returned is not compressed (the same size as with the service call before).</p> <p>Any tips to ensure that IIS compresses the string data value being returned by IIS?</p> <p>Update: I also followed the instructions on these links:</p> <p><a href="http://rextang.net/blogs/work/archive/2007/09/12/5654.aspx" rel="nofollow">http://rextang.net/blogs/work/archive/2007/09/12/5654.aspx</a> http://blogs.msdn.com/b/rextang/archive/2007/09/13/4880187.aspx</p> <p>Using IE9, I from the Developer Tools, checking the detailed view of the web service call, I can see that the Accept-Encoding key has a value of gzip/deflate.</p> <p>The web service SOAP XML (in String) value is still not being compressed. Any areas where I should be looking further?</p> <p>By the way, I am using IIS6.</p> <p>Update: I checked this site: <a href="http://blogs.iis.net/webtopics/archive/2009/02/24/troubleshooting-http-compression-in-iis-6-0.aspx" rel="nofollow">http://blogs.iis.net/webtopics/archive/2009/02/24/troubleshooting-http-compression-in-iis-6-0.aspx</a></p> <p>I got items 1,2,3 properly.</p> <p>For item 4, I even tried only setting asmx as extension but to no avail.</p> <p>For item 5, I don't have any compression setting at a child level.</p> <p>For item 6, the antivirus does not make a scan on the directory for compression.</p> <p>For item 7, I am passing no slash as parameter on the executing DLL.</p> <p>For item 8, I am unsure where/how to check for this.</p> <p>For item 9, I have checked with fiddler and the proper headers are being placed on the request headers.</p> <p>For item 10, I don't see any settings in my apps that would require touching this.</p> <p>For item 11, status code I am receiving is 200.</p> <p>For item 12, the app is accessed with no proxy specified.</p> <p>For item 13, the request is a web service.</p>
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    1. COAlthough tangentially related, take a look at [How to enable IIS compression for WCF services](http://stackoverflow.com/questions/1735088/how-to-enable-iis-compression-for-wcf-services).
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    2. COAnd [Gzip compression with WCF on IIS7](http://stackoverflow.com/questions/2713203/gzip-compression-with-wcf-hosted-on-iis7)
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    3. COYet another possible solution [asp.net and wcf compression via iis](http://www.traviswhidden.com/PublicBlog/tabid/358/EntryId/420/asp-net-and-wcf-compression-via-IIS.aspx)
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