node.js - POST request 404 (Not Found) - express-http-proxy -

i'm trying send post request api gives me following error:

i'm using express-http-proxy package node send request. here code:

app.use('/api', proxy(targeturl, {   forwardpath: (req, res) => {     return require('url').parse(req.url).path;   } })); 

in reactjs application, i'm using superagent pass request , here request creation code:

methods.foreach((method) =>       this[method] = (path, data = {}, params = {}) => new promise((resolve, reject) => {         const request = superagent[method](formaturl(path));         request.set('token', 'cb460084804cd40');          if (params) {           request.query(params);         }          if (__server__ && req.get('cookie')) {           request.set('cookie', req.get('cookie'));         }          if (data) {           request.send(data);         }         console.log('sending: ', request);         // request.end((err, { text } = {}) => {console.log('ended: ', text, err);});         // reject();         request.end((err, { text } = {}) => err ? reject(text || err) : resolve(text));       })); 

formaturl function

function formaturl(path) {   const adjustedpath = path[0] !== '/' ? '/' + path : path;   if (__server__) {     return 'https://' + config.apihost + adjustedpath;   }   return '/api' + adjustedpath; } 

in addition this, when send request, gives me following error:

also, when try send post request on live apiserver gives 404 not found error if try send post request on localhost apiserver gives 504 gateway_timeout error.

i not confident behaviour. therefore, need find problem. time in advance.