Page uses an invalid or unsupported form of compression when debugging ASP.NET MVC app with Visual Studio 2013 Preview
While trying to debug an ASP.NET MVC project using the recently released VS 2013 Preview I get this message:
Content Encoding Error
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
Please contact the website owners to inform them of this problem.
In Firebug I see this error message:
SecurityError: The operation is insecure
Tried with Google Chrome and IE 11 and the same problem happens.
What is causing this?
Note: I'm on Windows 8.1 and debugging the site using IIS Express at http://localhost:7777
I can debug it just fine using VS 2012.
Well... after trying some options, I disabled Browser Link in VS 2013 toolbar and my app login page just appeared.
Looks like they need to do a bit more work on this because it didn't work out of the box in my case.
After debugging the issue with Microsoft devs, Mads Kristensen (PM on ASP.NET) got to the bottom of the problem that was in my Web.config file.
Inside <system.webServer> element I have:
<urlCompression doDynamicCompression="true"
doStaticCompression="true"
dynamicCompressionBeforeCache="true" />
That dynamicCompressionBeforeCache="true" interferes with HttpModules (which is what is used by Browser Link). Setting it to false enables Browser Link in Visual Studio 2013 Preview.
References
Browser Link is used for connecting Visual Studio directly to browsers.
Browser Link – SignalR channel between browser and Visual Studio
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