It’s really not clear what you mean by “basic servlet API”, because the main rust web frameworks are pretty much just routing by default, with (largely opt-in)

It’s really not clear what you mean by “basic servlet API”, because the main rust web frameworks are pretty much just routing by default, with (largely opt-in) parsing and serialisation support. It “hasn’t been clear what the templating looks” like because there isn’t any just as AFAIK servlets provide no templating.