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