I've always have my handlers individually set as a struct each with a method to handle the route/request.

type CreateUser struct {

   store  storage.Store

   cache  caching.Cache

   logger logging.Logger

   pub    events.Publisher

   // etc

}

func (op CreateUser) ServeHTTP(ctx, req, rw) {}

// or if you have custom handlers

func (op CreateUser) ServeHTTP(ctx, input) (output, error) {}

And in my main.go, or where I set up my dependencies, I create each operation, passing it its specific dependencies. I love that because I can keep all the helper methods for that specific operation/handler on that specific struct as private methods.

It does get tedious when you have one operation needing another, as you might start passing these around or you extract that into its own package/service.