SVG source format doesn't work with WEBP_DETECTION and AVIF_DETECTION

[Frezyy123]

Hi, I am facing with some undocumented behaviour
If I have svg image as a source and enable all features with AVIF/WebP support detection, svg image will not be processed and imgproxy return svg image.

Looks like it skips everytime, when we have svg source image with missing extension

imgproxy/processing_handler.go

Lines 371 to 375 in 5d4a612

	if originData.Type == po.Format || po.Format == imagetype.Unknown {
	// Don't process SVG
	if originData.Type == imagetype.SVG {
	if config.SanitizeSvg {

So, everytime, when I have svg source, I need to add any extension, just to force this feature with detection. For example
https://example.com/image returns svg image
https://example.com/image@jpeg returns in respect of accept header, webp or avif

Could you please explain to me, why it works like this? Is there any problem with conversion svg?

[DarthSim]

Hey @Frezyy123!

SVGs are not rasterized unless the resulting format is explicitly specified. In the vast majority of cases rasterizing SVG doesn't bring any benefit. The only case I know where it makes sense is email.

However, having a rasterize_svg option may be useful 🤔

[Frezyy123]

In some cases svg icon is much more easier to draw, but iOS application have troubles with svg and choose webp format (or pdf but this is really bad way :))

I will try to implement this option and bring pull request to you
Thank you