Laravel idempotency middleware

Idempotency.php

<?php
 
namespace App\Http\Middleware;
 
use Closure;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Cache;
 
class Idempotency
{
    /**
     * The header name.
     *
     * @var string
     */
    const IDEMPOTENCY_HEADER = 'Idempotency-Key';
 
    /**
     * The idempotency cache time frame.
     *
     * @var int
     */
    const EXPIRATION_IN_MINUTES = 1440; // 24 hours
 
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int $retryAfter
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next, $retryAfter = self::EXPIRATION_IN_MINUTES)
    {
        $key = $request->header(static::IDEMPOTENCY_HEADER);
 
        if ($request->isMethodIdempotent() || ! $key) {
            return $next($request);
        }
 
        $cacheKey = 'Idempotency::'.$key;
        $uri = str_replace($request->root(), '', $request->fullUrl()) ?: '/';
 
        if (Cache::has($cacheKey)) {
            extract(Cache::get($cacheKey));
 
            if ($path == $uri) {
                $headers[static::IDEMPOTENCY_HEADER] = $key;
 
                return response($content, $status, $headers);
            }
        }
 
        $response = $next($request);
 
        if ($response->isClientError()) {
            // Don't idempotent client error request.
            return $response;
        }
 
        $response->header(static::IDEMPOTENCY_HEADER, $key);
 
        Cache::put($cacheKey, [
            'path' => $uri,
            'content' => $response->content(),
            'status' => $response->status(),
            'headers' => $this->headers($response->headers->all()),
        ], now()->addMinutes($retryAfter));
 
        return $response;
    }
 
    /**
     * Format the headers before saving to cache storage.
     *
     * @param  array $headers
     * @return array
     */
    protected function headers(array $headers)
    {
        return Arr::only($headers, [
            'content-type',
        ]);
    }
}