webp ie11 imageprocessor iis rewrite - Using Umbraco and getting started

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Dan Evans 631 posts 1018 karma points

Apr 08, 2021 @ 17:53

0

WebP / IE11 / ImageProcessor / IIS Rewrite

I'd like to use ImageProcessor to serve WebP images - i've installed the necessary plugin and works great. Problem is that WebP doesn't work in IE11 and we still need to support the browser

I think the best way around this would be to use an IIS Rewrite to parse querystrings for format=webp and replace it with format=jpg when the user agent is MSIE but I have no idea how to create that rewrite.

Thanks!

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Marc Goodson 2155 posts 14408 karma points MVP 9x c-trib

Apr 08, 2021 @ 18:27
1
Hi Dan

Could you use the Picture element to serve your image?
```
<picture>
  <source srcset="img/awesomeWebPImage.webp" type="image/webp">
  <source srcset="img/creakyOldJPEG.jpg" type="image/jpeg"> 
  <img src="img/creakyOldJPEG.jpg" alt="Alt Text!">
</picture>
```
Example stolen from @Soren in this thread:

https://our.umbraco.com/forum/using-umbraco-and-getting-started/94579-how-to-use-webp-format-with-the-image-processor#comment-300798

regards

Marc
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Søren Kottal 712 posts 4570 karma points MVP 6x c-trib

Apr 08, 2021 @ 18:34

1

Thanks for mentioning, @Marc.

@Dan, you can also handle it serverside - shown here by Kieron https://kieron.codes/blog/using-webp-images-in-umbraco/

I prefer the picture tag though :)

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Dan Evans 631 posts 1018 karma points

Apr 09, 2021 @ 07:25

0

Thanks for these suggestions - both are really useful. I went for the server side solution as it's an existing site and it minimised code changes.

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WebP / IE11 / ImageProcessor / IIS Rewrite