MIME type warning in chrome for png images

image png google-chrome mime warnings
Muleskinner picture Muleskinner · Jul 13, 2010 · Viewed 47.6k times · Source

Just ran my site in chrome and suprisingly it comes up with this warning for each of my .png images:

Resource interpreted as image but transferred with MIME type application/octet-stream.

Anyone seen this before?

Regards

Answer

Stefan Mohr picture Stefan Mohr · Feb 2, 2011

I encountered this while running an ASP.NET WebForms app using the ASP.NET Development Server.

I suspect something similar will happen if you use IIS Express as your server as well (VS 2010 SP1).

I 'resolved' my problem locally by editing the project settings (under Web) and changed from the ASP.NET Development Server to IIS on my local machine. I can see that PNG was already defined correctly as an image MIME type and indeed when I hit my local IIS server it's serving up the file with the correct type.

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