HTTP middleware support

[legionth]

There is currently no standard of HTTP middleware in PHP, but I consider to use similar approach as the proposed standard of php-fig.

[andig]

Could I propose to delay this post 0.8, potentially 0.9? php-pm is really anxious about getting our hand on 0.8 and anything that could cause a delay would be nice to postpone.

It's also not mentioned in the roadmap right now.

[WyriHaximus]

Sounds good to me 👍

[clue]

@andig I agree that this ticket should not block the request body parsers at all 👍

It's my understanding that the middleware support could easily be used to build request body parsers on top similar to this:

$app = function (function ServerRequestInterface $request) {
    return Response(200, array(), var_export($request->getParsedBody(), true));
};

$chain = new MiddlewareChain(
    new BufferMiddleware(1024 * 100), // buffer 100 KiB max
    new ParseBodyMiddleware(), // simply parse the buffered body
    $app // execute the actual request handler
);

$server = new Server($chain);

This is just a very rough draft and we will likely want to implement some API sugar on top of this. This is a very common feature request and probably not something we want every user to type out.

The nice thing about this is that this does not involve a BC break and we can also release this as part of v0.7.x in the future and subsequently add more parsers in the future.

I've prepared a number of PRs for this already and will look into this the upcoming weeks. Also, I'm really curious what @WyriHaximus will come up with 👍

[WyriHaximus]

I've prepared a number of PRs for this already and will look into this the upcoming weeks. Also, I'm really curious what @WyriHaximus will come up with 👍

Looking forward to what you have come up with @clue, are you following the middleware PSR discussions in the FIG? Would be most interesting support that when it comes out.

With regards to body parsers I think the parsers them self are in pretty good shape but need some tweaking. Going to get issues with my plans and PR's implementing up starting tomorrow

[clue]

Closed via #215