Support source format and use suffix as final format

[atinux]

Describe the feature

My suggestion would be to have the possibility to tell IPX that it should use the suffix as final format and use the sf or source_format to find the source

Ex: /sf_svg/nuxt.png will be translated to /f_png/nuxt.svg

This allow SSG to work since the browser uses the extension as final format.

Additional information

• [X] Would you be willing to help implement this feature?