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JSFiddle - React, Tailwind, and code Playground

JavaScript

//$.getJSON('/echo/json', function(){console.log('ok');})
//$.getJSON('/', function(){console.log('ok');}) //no response or exceptions
//$.getJSON('//', function(){console.log('ok');}) //cors exception, expected
//$.getJSON('/echo/json', function(){console.log('ok');}) //cors exception, expected
 //$.getJSON("/", function(){console.log('ok');}) //no response or exceptions

//$.ajax({ url: '/echo/json', cache: false, success: function(){ console.log('works'); } });
$.ajax({ url: '/', cache: false, success: function(){ console.log('works'); } }); //works
$.ajax({ url: '//', cache: false, success: function(){ console.log('works'); } }); //cors exception

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JSFiddle - React, Tailwind, and code Playground

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