Initial

system/HTTP/MessageInterface.php

@@ -0,0 +1,101 @@
+<?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;
+
+use CodeIgniter\HTTP\Exceptions\HTTPException;
+
+/**
+ * Expected behavior of an HTTP request
+ */
+interface MessageInterface
+{
+    /**
+     * Sets the body of the current message.
+     *
+     * @param mixed $data
+     *
+     * @return $this
+     */
+    public function setBody($data);
+
+    /**
+     * Appends data to the body of the current message.
+     *
+     * @param mixed $data
+     *
+     * @return $this
+     */
+    public function appendBody($data);
+
+    /**
+     * Populates the $headers array with any headers the getServer knows about.
+     */
+    public function populateHeaders(): void;
+
+    /**
+     * Returns an array containing all Headers.
+     *
+     * @return array<string, Header> An array of the Header objects
+     */
+    public function headers(): array;
+
+    /**
+     * Returns a single Header object. If multiple headers with the same
+     * name exist, then will return an array of header objects.
+     *
+     * @param string $name
+     *
+     * @return array|Header|null
+     */
+    public function header($name);
+
+    /**
+     * Sets a header and it's value.
+     *
+     * @param array|string|null $value
+     *
+     * @return $this
+     */
+    public function setHeader(string $name, $value);
+
+    /**
+     * Removes a header from the list of headers we track.
+     *
+     * @return $this
+     */
+    public function removeHeader(string $name);
+
+    /**
+     * Adds an additional header value to any headers that accept
+     * multiple values (i.e. are an array or implement ArrayAccess)
+     *
+     * @return $this
+     */
+    public function appendHeader(string $name, ?string $value);
+
+    /**
+     * Adds an additional header value to any headers that accept
+     * multiple values (i.e. are an array or implement ArrayAccess)
+     *
+     * @return $this
+     */
+    public function prependHeader(string $name, string $value);
+
+    /**
+     * Sets the HTTP protocol version.
+     *
+     * @throws HTTPException For invalid protocols
+     *
+     * @return $this
+     */
+    public function setProtocolVersion(string $version);
+}