Hi everyone,
I had a look at the spec and at the metadocument, but couldn't find an
answer to my questions about PSR-15 (HTTP middlewares for those mixing up
the numbers like me):
- why are middleware stacks not middlewares too?
- as corollary, why StackInterface exists at all?
interface StackInterface{ /** snip< withMiddleware() and withoutMiddleware()
> */
public function process(RequestInterface $request);}
This looks a lot like the signature of a middleware, except it can't call
"next". I've seen scenarios where it might be useful to have a middleware
stack inside another middleware (i.e. nested in another middleware stack or
router) - here is an
illustration: https://github.com/stratifyphp/router#everything-is-a-middleware
If we consider middleware stacks just like any other middleware, the
standard is much simpler and we don't need the StackInterface. It also
sounds to me like standardizing a middleware stack is out of scope for a
middleware standard.
I did not forget the 2 other methods of the StackInterface:
withMiddleware() and withoutMiddleware(). These 2 methods are used for
configuration, which is often done by users. I don't see why we would want
interoperability at that level. It's like the LoggerInterface doesn't
contain methods for configuring the logger.
Cheers
Matthieu
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