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diff --git a/wp-includes/class-wp-simplepie-file.php b/wp-includes/class-wp-simplepie-file.php
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+++ b/wp-includes/class-wp-simplepie-file.php
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+<?php
+/**
+ * Feed API: WP_SimplePie_File class
+ *
+ * @package WordPress
+ * @subpackage Feed
+ * @since 4.7.0
+ */
+
+/**
+ * Core class for fetching remote files and reading local files with SimplePie.
+ *
+ * This uses Core's HTTP API to make requests, which gives plugins the ability
+ * to hook into the process.
+ *
+ * @since 2.8.0
+ */
+#[AllowDynamicProperties]
+class WP_SimplePie_File extends SimplePie_File {
+
+	/**
+	 * Timeout.
+	 *
+	 * @var int How long the connection should stay open in seconds.
+	 */
+	public $timeout = 10;
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 2.8.0
+	 * @since 3.2.0 Updated to use a PHP5 constructor.
+	 * @since 5.6.1 Multiple headers are concatenated into a comma-separated string,
+	 *              rather than remaining an array.
+	 *
+	 * @param string       $url             Remote file URL.
+	 * @param int          $timeout         Optional. How long the connection should stay open in seconds.
+	 *                                      Default 10.
+	 * @param int          $redirects       Optional. The number of allowed redirects. Default 5.
+	 * @param string|array $headers         Optional. Array or string of headers to send with the request.
+	 *                                      Default null.
+	 * @param string       $useragent       Optional. User-agent value sent. Default null.
+	 * @param bool         $force_fsockopen Optional. Whether to force opening internet or unix domain socket
+	 *                                      connection or not. Default false.
+	 */
+	public function __construct( $url, $timeout = 10, $redirects = 5, $headers = null, $useragent = null, $force_fsockopen = false ) {
+		$this->url       = $url;
+		$this->timeout   = $timeout;
+		$this->redirects = $redirects;
+		$this->headers   = $headers;
+		$this->useragent = $useragent;
+
+		$this->method = SIMPLEPIE_FILE_SOURCE_REMOTE;
+
+		if ( preg_match( '/^http(s)?:\/\//i', $url ) ) {
+			$args = array(
+				'timeout'     => $this->timeout,
+				'redirection' => $this->redirects,
+			);
+
+			if ( ! empty( $this->headers ) ) {
+				$args['headers'] = $this->headers;
+			}
+
+			if ( SIMPLEPIE_USERAGENT !== $this->useragent ) { // Use default WP user agent unless custom has been specified.
+				$args['user-agent'] = $this->useragent;
+			}
+
+			$res = wp_safe_remote_request( $url, $args );
+
+			if ( is_wp_error( $res ) ) {
+				$this->error   = 'WP HTTP Error: ' . $res->get_error_message();
+				$this->success = false;
+
+			} else {
+				$this->headers = wp_remote_retrieve_headers( $res );
+
+				/*
+				 * SimplePie expects multiple headers to be stored as a comma-separated string,
+				 * but `wp_remote_retrieve_headers()` returns them as an array, so they need
+				 * to be converted.
+				 *
+				 * The only exception to that is the `content-type` header, which should ignore
+				 * any previous values and only use the last one.
+				 *
+				 * @see SimplePie_HTTP_Parser::new_line().
+				 */
+				foreach ( $this->headers as $name => $value ) {
+					if ( ! is_array( $value ) ) {
+						continue;
+					}
+
+					if ( 'content-type' === $name ) {
+						$this->headers[ $name ] = array_pop( $value );
+					} else {
+						$this->headers[ $name ] = implode( ', ', $value );
+					}
+				}
+
+				$this->body        = wp_remote_retrieve_body( $res );
+				$this->status_code = wp_remote_retrieve_response_code( $res );
+			}
+		} else {
+			$this->error   = '';
+			$this->success = false;
+		}
+	}
+}