diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-includes/IXR/class-IXR-client.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/IXR/class-IXR-client.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,166 @@
+<?php
+
+/**
+ * IXR_Client
+ *
+ * @package IXR
+ * @since 1.5.0
+ *
+ */
+class IXR_Client
+{
+    var $server;
+    var $port;
+    var $path;
+    var $useragent;
+    var $response;
+    var $message = false;
+    var $debug = false;
+    var $timeout;
+    var $headers = array();
+
+    // Storage place for an error message
+    var $error = false;
+
+	/**
+	 * PHP5 constructor.
+	 */
+    function __construct( $server, $path = false, $port = 80, $timeout = 15 )
+    {
+        if (!$path) {
+            // Assume we have been given a URL instead
+            $bits = parse_url($server);
+            $this->server = $bits['host'];
+            $this->port = isset($bits['port']) ? $bits['port'] : 80;
+            $this->path = isset($bits['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->server = $server;
+            $this->path = $path;
+            $this->port = $port;
+        }
+        $this->useragent = 'The Incutio XML-RPC PHP Library';
+        $this->timeout = $timeout;
+    }
+
+	/**
+	 * PHP4 constructor.
+	 */
+	public function IXR_Client( $server, $path = false, $port = 80, $timeout = 15 ) {
+		self::__construct( $server, $path, $port, $timeout );
+	}
+
+    function query()
+    {
+        $args = func_get_args();
+        $method = array_shift($args);
+        $request = new IXR_Request($method, $args);
+        $length = $request->getLength();
+        $xml = $request->getXml();
+        $r = "\r\n";
+        $request  = "POST {$this->path} HTTP/1.0$r";
+
+        // Merged from WP #8145 - allow custom headers
+        $this->headers['Host']          = $this->server;
+        $this->headers['Content-Type']  = 'text/xml';
+        $this->headers['User-Agent']    = $this->useragent;
+        $this->headers['Content-Length']= $length;
+
+        foreach( $this->headers as $header => $value ) {
+            $request .= "{$header}: {$value}{$r}";
+        }
+        $request .= $r;
+
+        $request .= $xml;
+
+        // Now send the request
+        if ($this->debug) {
+            echo '<pre class="ixr_request">'.htmlspecialchars($request)."\n</pre>\n\n";
+        }
+
+        if ($this->timeout) {
+            $fp = @fsockopen($this->server, $this->port, $errno, $errstr, $this->timeout);
+        } else {
+            $fp = @fsockopen($this->server, $this->port, $errno, $errstr);
+        }
+        if (!$fp) {
+            $this->error = new IXR_Error(-32300, 'transport error - could not open socket');
+            return false;
+        }
+        fputs($fp, $request);
+        $contents = '';
+        $debugContents = '';
+        $gotFirstLine = false;
+        $gettingHeaders = true;
+        while (!feof($fp)) {
+            $line = fgets($fp, 4096);
+            if (!$gotFirstLine) {
+                // Check line for '200'
+                if (strstr($line, '200') === false) {
+                    $this->error = new IXR_Error(-32300, 'transport error - HTTP status code was not 200');
+                    return false;
+                }
+                $gotFirstLine = true;
+            }
+            if (trim($line) == '') {
+                $gettingHeaders = false;
+            }
+            if (!$gettingHeaders) {
+            	// merged from WP #12559 - remove trim
+                $contents .= $line;
+            }
+            if ($this->debug) {
+            	$debugContents .= $line;
+            }
+        }
+        if ($this->debug) {
+            echo '<pre class="ixr_response">'.htmlspecialchars($debugContents)."\n</pre>\n\n";
+        }
+
+        // Now parse what we've got back
+        $this->message = new IXR_Message($contents);
+        if (!$this->message->parse()) {
+            // XML error
+            $this->error = new IXR_Error(-32700, 'parse error. not well formed');
+            return false;
+        }
+
+        // Is the message a fault?
+        if ($this->message->messageType == 'fault') {
+            $this->error = new IXR_Error($this->message->faultCode, $this->message->faultString);
+            return false;
+        }
+
+        // Message must be OK
+        return true;
+    }
+
+    function getResponse()
+    {
+        // methodResponses can only have one param - return that
+        return $this->message->params[0];
+    }
+
+    function isError()
+    {
+        return (is_object($this->error));
+    }
+
+    function getErrorCode()
+    {
+        return $this->error->code;
+    }
+
+    function getErrorMessage()
+    {
+        return $this->error->message;
+    }
+}