Hi Forum :slight_smile: Before Umbraco 17 we didn’t use HMACSecretKey, so we didn’t have a problem using a WebP Middleware which automatically checked if WebP was supported and appended the “format=webp” if it was. But this is not the case anymore :slight_smile: So we have begun using HMACSecretK…

hi Anders, I have a webp middleware and HMAC on 17 and I haven’t seen the issue, Umbraco passes the secret to ImageSharp.Web so everything is calculated at the correct time, at least in my experience. Matt

Sounds good :slight_smile: Mine just won’t render the images and i keep getting errors in the console. Can i ask how you done it or to post your middleware?

Sure thing :slight_smile: Composer services.Configure<ImageSharpMiddlewareOptions>(options => { // Capture existing task to not overwrite it var onParseCommandsAsync = options.OnParseCommandsAsync; options.OnParseCommandsAsync = async context => { ImageProcessing.ConvertImageToWebP(conte…

I’m still having issues with images not showing on the frontend and Umbraco :see_no_evil_monkey: Yeah i have deleted the whole temp folder aswell .. :slight_smile:

Webp support is widespread, so honestly, we only serve webp images these days. However, if you want to support non-webp browsers, why don’t you simply create an image source set in the html with multiple formats? I agree that the html will get a little bigger, but you let the browser decide what it…

FWIW @AndersBrohus , I was working on this exact task just yesterday and was experiencing the same results. We started out a new project on 17.1 We’re now on 17.2.2 and always convert all of our images to .webp I followed the imaging settings documentation and all the images resulted in a 404. I…

Started seeing a similar issue myself now but its fine if the image is using GetCropUrl(…) so all the media based images are happy, however just a url with no crops or querystring I hit the issue as the HMAC querystring is missing

I know nothing. But given the approach above, I ran into the same issue. Once you apply formatting commands, I suspect a HMAC is required. i.e., a request with no image-crop commands has no HMAC, but once you apply a command, an HMAC (and a valid one) is required. Thanks to this discussion, I reali…

[image] Stop Large Image been Uploaded or Resize on Upload speech_balloonQuestions The getCropUrl method generates an HMAC and appends it to the URL automatically. If you want to do something bespoke, you have to generate the record of imagesharp options, then …

This ended up been for images that were not be called by GetCropUrl() added a to my vite config and static images and the middleware works as before

WebP Middleware and HMACSecretKey

Questions

mistyn8 (Mike Chambers) April 10, 2026, 4:09pm 11