When you creating remote links in Rails usually you point them to JS actions and don’t expect that users will try to open that links in a new tab. But they will definitely try and you’ll get lots of ActionController::UnknownFormat errors. To prevent this use the following snippet:

const remoteLinks = Array.from(document.querySelectorAll("a[data-remote='true']"))
remoteLinks.forEach(function(element) {
  element.dataset.url = element.href
  element.href = "javascript:void(0);"
})

Rails.href = function(element) {
  return element.dataset.url || element.href
}

It will move actual url to data attribute and replace it with javascript:void(0); which prevents browsers from opening link in new tab. And Rails.href method will re-define how UJS pulls URL from remote link.

Put this snippet into you application.js and don’t forget to wrap it with document.addEventListener('turbolinks:load', function() {}) if you use Turbolinks.