Hola!
We have released recent versions of mod_wasm allowing Wasm modules to return any output type via stdout, including binaries with non UTF-8 bytes sequences or \0 NULL terminators in the middle, among other fixes (see CHANGELOG<https://github.com/vmware-labs/mod_wasm/blob/main/CHANGELOG.md> for details). These new versions allowed us to run new fully functional and unmodified applications (such as Drupal) in a safe WebAssembly environment. We will release a demo soon and a post with all the details. We believe mod_wasm is getting ready for a v1.0.0 release. So, we really would like to get feedback from the HTTPD committers here. Still our plan is contributing this module upstream and helping to maintain it. Cheers! Jesús