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3 liveuser 1 
<?php
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namespace Ratchet\Http;
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use Ratchet\ConnectionInterface;
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use GuzzleHttp\Psr7 as gPsr;
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use GuzzleHttp\Psr7\Response;
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trait CloseResponseTrait {
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    /**
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     * Close a connection with an HTTP response
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     * @param \Ratchet\ConnectionInterface $conn
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     * @param int                          $code HTTP status code
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     * @return null
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     */
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    private function close(ConnectionInterface $conn, $code = 400, array $additional_headers = []) {
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        $response = new Response($code, array_merge([
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            'X-Powered-By' => \Ratchet\VERSION
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        ], $additional_headers));
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        $conn->send(gPsr\str($response));
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        $conn->close();
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    }
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}