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This is one way to add csrf-token to your request from elm to rails. This is general solution, I use it with rails.
var send = XMLHttpRequest.prototype.send,
token = document.querySelector("meta[name=csrf-token]").getAttribute("content");
XMLHttpRequest.prototype.send = function(data){
this.setRequestHeader('X-CSRF-Token', token);
return send.apply(this, arguments);
console.log("csrf-token: " + document.querySelector("meta[name=csrf-token]").getAttribute("content"))
// To test that it works
// var xhr = new XMLHttpRequest();'POST', '/api/v1/events', true);
xhr.onload = function () {
console.log("Request finished. Do processing here.");
xhr.setRequestHeader("Content-type", "application/json; charset=utf-8");
// Thanks to Louis Simoneau & Rahul Trikha
// Taken from there talk on Elm, at RubyConf AU 2017
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