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diff --git a/wp-includes/class-wp-http-response.php b/wp-includes/class-wp-http-response.php
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+++ b/wp-includes/class-wp-http-response.php
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+<?php
+/**
+ * HTTP API: WP_HTTP_Response class
+ *
+ * @package WordPress
+ * @subpackage HTTP
+ * @since 4.4.0
+ */
+
+/**
+ * Core class used to prepare HTTP responses.
+ *
+ * @since 4.4.0
+ */
+#[AllowDynamicProperties]
+class WP_HTTP_Response {
+
+	/**
+	 * Response data.
+	 *
+	 * @since 4.4.0
+	 * @var mixed
+	 */
+	public $data;
+
+	/**
+	 * Response headers.
+	 *
+	 * @since 4.4.0
+	 * @var array
+	 */
+	public $headers;
+
+	/**
+	 * Response status.
+	 *
+	 * @since 4.4.0
+	 * @var int
+	 */
+	public $status;
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param mixed $data    Response data. Default null.
+	 * @param int   $status  Optional. HTTP status code. Default 200.
+	 * @param array $headers Optional. HTTP header map. Default empty array.
+	 */
+	public function __construct( $data = null, $status = 200, $headers = array() ) {
+		$this->set_data( $data );
+		$this->set_status( $status );
+		$this->set_headers( $headers );
+	}
+
+	/**
+	 * Retrieves headers associated with the response.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @return array Map of header name to header value.
+	 */
+	public function get_headers() {
+		return $this->headers;
+	}
+
+	/**
+	 * Sets all header values.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param array $headers Map of header name to header value.
+	 */
+	public function set_headers( $headers ) {
+		$this->headers = $headers;
+	}
+
+	/**
+	 * Sets a single HTTP header.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string $key     Header name.
+	 * @param string $value   Header value.
+	 * @param bool   $replace Optional. Whether to replace an existing header of the same name.
+	 *                        Default true.
+	 */
+	public function header( $key, $value, $replace = true ) {
+		if ( $replace || ! isset( $this->headers[ $key ] ) ) {
+			$this->headers[ $key ] = $value;
+		} else {
+			$this->headers[ $key ] .= ', ' . $value;
+		}
+	}
+
+	/**
+	 * Retrieves the HTTP return code for the response.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @return int The 3-digit HTTP status code.
+	 */
+	public function get_status() {
+		return $this->status;
+	}
+
+	/**
+	 * Sets the 3-digit HTTP status code.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param int $code HTTP status.
+	 */
+	public function set_status( $code ) {
+		$this->status = absint( $code );
+	}
+
+	/**
+	 * Retrieves the response data.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @return mixed Response data.
+	 */
+	public function get_data() {
+		return $this->data;
+	}
+
+	/**
+	 * Sets the response data.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param mixed $data Response data.
+	 */
+	public function set_data( $data ) {
+		$this->data = $data;
+	}
+
+	/**
+	 * Retrieves the response data for JSON serialization.
+	 *
+	 * It is expected that in most implementations, this will return the same as get_data(),
+	 * however this may be different if you want to do custom JSON data handling.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @return mixed Any JSON-serializable value.
+	 */
+	public function jsonSerialize() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
+		return $this->get_data();
+	}
+}