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system/HTTP/RequestInterface.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\HTTP;
+
+/**
+ * Expected behavior of an HTTP request
+ *
+ * @mixin IncomingRequest
+ * @mixin CLIRequest
+ * @mixin CURLRequest
+ */
+interface RequestInterface
+{
+    /**
+     * Gets the user's IP address.
+     * Supplied by RequestTrait.
+     *
+     * @return string IP address
+     */
+    public function getIPAddress(): string;
+
+    /**
+     * Validate an IP address
+     *
+     * @param string $ip    IP Address
+     * @param string $which IP protocol: 'ipv4' or 'ipv6'
+     *
+     * @deprecated Use Validation instead
+     */
+    public function isValidIP(string $ip, ?string $which = null): bool;
+
+    /**
+     * Get the request method.
+     * An extension of PSR-7's getMethod to allow casing.
+     *
+     * @param bool $upper Whether to return in upper or lower case.
+     *
+     * @deprecated The $upper functionality will be removed and this will revert to its PSR-7 equivalent
+     */
+    public function getMethod(bool $upper = false): string;
+
+    /**
+     * Fetch an item from the $_SERVER array.
+     * Supplied by RequestTrait.
+     *
+     * @param string $index  Index for item to be fetched from $_SERVER
+     * @param null   $filter A filter name to be applied
+     *
+     * @return mixed
+     */
+    public function getServer($index = null, $filter = null);
+}