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vendor/psr/http-server-middleware/src/MiddlewareInterface.php

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+<?php
+
+namespace Psr\Http\Server;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+/**
+ * Participant in processing a server request and response.
+ *
+ * An HTTP middleware component participates in processing an HTTP message:
+ * by acting on the request, generating the response, or forwarding the
+ * request to a subsequent middleware and possibly acting on its response.
+ */
+interface MiddlewareInterface
+{
+    /**
+     * Process an incoming server request.
+     *
+     * Processes an incoming server request in order to produce a response.
+     * If unable to produce the response itself, it may delegate to the provided
+     * request handler to do so.
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface;
+}