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Editing: class-wp-http-ixr-client.php

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<?php
/**
 * WP_HTTP_IXR_Client
 *
 * @package WordPress
 * @since 3.1.0
 */
#[AllowDynamicProperties]
class WP_HTTP_IXR_Client extends IXR_Client {
	public $scheme;
	/**
	 * @var IXR_Error
	 */
	public $error;

/**
	 * @param string       $server
	 * @param string|false $path
	 * @param int|false    $port
	 * @param int          $timeout
	 */
	public function __construct( $server, $path = false, $port = false, $timeout = 15 ) {
		if ( ! $path ) {
			// Assume we have been given a URL instead.
			$bits         = parse_url( $server );
			$this->scheme = $bits['scheme'] ?? '';
			$this->server = $bits['host'] ?? '';
			$this->port   = $bits['port'] ?? $port;
			$this->path   = $bits['path'] ?? '/';

// Make absolutely sure we have a path.
			if ( ! $this->path ) {
				$this->path = '/';
			}

if ( ! empty( $bits['query'] ) ) {
				$this->path .= '?' . $bits['query'];
			}
		} else {
			$this->scheme = 'http';
			$this->server = $server;
			$this->path   = $path;
			$this->port   = $port;
		}
		$this->useragent = 'The Incutio XML-RPC PHP Library';
		$this->timeout   = $timeout;
	}

/**
	 * @since 3.1.0
	 * @since 5.5.0 Formalized the existing `...$args` parameter by adding it
	 *              to the function signature.
	 *
	 * @return bool True if the request succeeded, false otherwise.
	 */
	public function query( ...$args ) {
		$method  = array_shift( $args );
		$request = new IXR_Request( $method, $args );
		$xml     = $request->getXml();

$port = $this->port ? ":$this->port" : '';
		$url  = $this->scheme . '://' . $this->server . $port . $this->path;
		$args = array(
			'headers'    => array( 'Content-Type' => 'text/xml' ),
			'user-agent' => $this->useragent,
			'body'       => $xml,
		);

// Merge Custom headers ala #8145.
		foreach ( $this->headers as $header => $value ) {
			$args['headers'][ $header ] = $value;
		}

/**
		 * Filters the headers collection to be sent to the XML-RPC server.
		 *
		 * @since 4.4.0
		 *
		 * @param string[] $headers Associative array of headers to be sent.
		 */
		$args['headers'] = apply_filters( 'wp_http_ixr_client_headers', $args['headers'] );

if ( false !== $this->timeout ) {
			$args['timeout'] = $this->timeout;
		}

// Now send the request.
		if ( $this->debug ) {
			echo '<pre class="ixr_request">' . htmlspecialchars( $xml ) . "\n</pre>\n\n";
		}

$response = wp_safe_remote_post( $url, $args );

if ( is_wp_error( $response ) ) {
			$errno       = $response->get_error_code();
			$errorstr    = $response->get_error_message();
			$this->error = new IXR_Error( -32300, "transport error: $errno $errorstr" );
			return false;
		}

if ( 200 !== wp_remote_retrieve_response_code( $response ) ) {
			$this->error = new IXR_Error( -32301, 'transport error - HTTP status code was not 200 (' . wp_remote_retrieve_response_code( $response ) . ')' );
			return false;
		}

if ( $this->debug ) {
			echo '<pre class="ixr_response">' . htmlspecialchars( wp_remote_retrieve_body( $response ) ) . "\n</pre>\n\n";
		}

// Now parse what we've got back.
		$this->message = new IXR_Message( wp_remote_retrieve_body( $response ) );
		if ( ! $this->message->parse() ) {
			// XML error.
			$this->error = new IXR_Error( -32700, 'parse error. not well formed' );
			return false;
		}

// Is the message a fault?
		if ( 'fault' === $this->message->messageType ) {
			$this->error = new IXR_Error( $this->message->faultCode, $this->message->faultString );
			return false;
		}

// Message must be OK.
		return true;
	}
}

Editing: class-wp-http-ixr-client.php

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