tests/http/payload.php


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<?php

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;

function handleRequest(ServerRequestInterface $req, ResponseInterface $resp): ResponseInterface
{
    // we expect json body
    $p = json_decode($req->getBody(), true);
    $resp->getBody()->write(json_encode(array_flip($p)));

    return $resp;
}