--- /dev/null
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @see http://github.com/zendframework/zend-diactoros for the canonical source repository
+ * @copyright Copyright (c) 2015-2016 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Zend\Diactoros;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * HTTP Request encapsulation
+ *
+ * Requests are considered immutable; all methods that might change state are
+ * implemented such that they retain the internal state of the current
+ * message and return a new instance that contains the changed state.
+ */
+class Request implements RequestInterface
+{
+ use RequestTrait;
+
+ /**
+ * @param null|string|UriInterface $uri URI for the request, if any.
+ * @param null|string $method HTTP method for the request, if any.
+ * @param string|resource|StreamInterface $body Message body, if any.
+ * @param array $headers Headers for the message, if any.
+ * @throws \InvalidArgumentException for any invalid value.
+ */
+ public function __construct($uri = null, $method = null, $body = 'php://temp', array $headers = [])
+ {
+ $this->initialize($uri, $method, $body, $headers);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getHeaders()
+ {
+ $headers = $this->headers;
+ if (! $this->hasHeader('host')
+ && $this->uri->getHost()
+ ) {
+ $headers['Host'] = [$this->getHostFromUri()];
+ }
+
+ return $headers;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getHeader($header)
+ {
+ if (! $this->hasHeader($header)) {
+ if (strtolower($header) === 'host'
+ && $this->uri->getHost()
+ ) {
+ return [$this->getHostFromUri()];
+ }
+
+ return [];
+ }
+
+ $header = $this->headerNames[strtolower($header)];
+
+ return $this->headers[$header];
+ }
+}