handleOnClick = () => {
  fetch(proxyUrl + targetUrl)
 .then(res => res.json())
 .then(shop => {
   console.table(shop); // create table in console
   this.setState({
     shop ,
     isLoading:false,
   });
 })
 .catch(e => {
   console.log(e);
 });
} ;

constructor() {
    super();
function handleOnClick() {
    fetch(proxyUrl + targetUrl)
   .then(res => res.json())
   .then(shop => {
     console.table(shop); // create table in console
     this.setState({
       shop ,
       isLoading:false,
     });
   })
   .catch(e => {
     console.log(e);
   });
  } ;
}

 handleOnClick();

state = {
    isLoading: true,
    shop: null,
    error: null
  };

  setState({shop ,isLoading:true}).then(this.setState({ shop , isLoading:false }); })

handleSubmit(e) {
    e.preventDefault();
    this.forceUpdate();
.
.
.
.
onClick={() => {console.log("test"); this.forceUpdate()} }

constructor(){
    super();
    this.forceUpdateHandler = this.forceUpdateHandler.bind(this);
  };

  forceUpdateHandler(){
    this.forceUpdate();
  };
.
.
.
onClick={() => {console.log("test"); this.forceUpdateHandler()} }>