node.js - Posting xml to a url in nodejs -

i developing client program hit post url , response below code

var http = require('http'); var fs = require('fs');  var postdata = "<?xml version = '1.0' encoding = 'utf-8'?><rest><contact>aa</contact></rest>";  fs.readfile('sampledata.xml', 'utf8', function (err, filedata) { if (err) {     return console.log(err); } else {     console.log("\n data : \n\n" +filedata);      var options = {         host: 'kkk',         port: 1,         path: '/root',         method: 'post',         headers: {             "content-type" : 'application/xml'         }     };      var reqclient = http.request(options, function(res)     {         res.setencoding('utf8');         res.on('data', function (chunk)         {             //console.log('body: ' + chunk);         });     });      //posts data server     reqclient.write(postdata);     reqclient.end();      reqclient.on('response', function (response)     {         response.on('data', function (chunk)         {             //console.log(response.statuscode + "\n");             //console.log(response.headers);             console.log("\n" + 'response: ' + chunk);         });     });     }  }); 

i tried reading xml data file plus passed data directly in req.write.both times throwing me error because xml passing string.i need solution convert string xml before passing.i stuck here.any helpful.

i tried new approach please find below code

var http = require('http'); var body='<?xml version="1.0" encoding="utf-8"?>'+ '<rest><listofln_interface>'+ '<contact>123304</contact>'+ '</listofln_interface></rest>';    var postrequest = { host: "hhhh", path: "/contact", port: 01, method: "post", headers: {      'content-type': 'application/xml',     'content-length': buffer.bytelength(body) } };   var buffer = "";  var req = http.request( postrequest , function( res )    {  console.log( res.statuscode ); console.log( res.headers); var buffer = ""; var chunks = []; res.on('data', function (data) {     chunks.push(data); }); res.on('end', function(){     var body1 = buffer.concat(chunks).tostring();      //var xmldoc = libxmljs.parsexml(body);    // var status = xmldoc.get('//status').text();     //var ticket = xmldoc.get('//incident_id').text();     console.log(body1); });  //res.on( "data", function( data ) { buffer = buffer + data; } ); // res.on( "end", function( data ) { console.log( buffer ); } );  });  req.write( body ); req.end(); 

this threw me 500 internal server error.dont know goin wrong.