http - Why does the website url is appending when I call an proxy server api -

i working on react application . configured proxy using module http-proxy-middleware.

at flags page , website url looks //localhost:9000/flags/all .

when user clicks on button in flags page , need call sparkle(rest service) api , should load result. when call sparkle api , internally website url appending , api call forming http://sgd01d:10700/all/sparkle/flags instead of //sgd01d:10700/sparkle/flags . why "all" appending api call? how solve issue

//server app.use('/sparkle', proxy(proxies.sparkle_config()));   //proxy config class proxies {   static sparkle_config() { return {   target: 'http://sgd01d:10700', // target host   changeorigin: true // needed virtual hosted sites   };  } } export default proxies;      //react action     //redux-thunk     export function loadflags() {       return function(dispatch) {         dispatch(beginajaxcall());          const promise = axios({url: 'sparkle/v1/api/flag', timeout: 20000, method: 'get', responsetype: 'json'});         promise.then(function(flags) {                         dispatch(loadflagssuccess(flags));         }).catch(function(error) {           throw(error);         });        };     } 

it looks problem because relative paths in api call. call api axios absolute path:

const promise = axios({url: '/sparkle/v1/api/flag', timeout: 20000, method: 'get', responsetype: 'json'});