polygerrit-ui/app/behaviors/gr-url-encoding-behavior.html

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<script>
(function(window) {
  'use strict';

  window.Gerrit = window.Gerrit || {};

  /** @polymerBehavior Gerrit.URLEncodingBehavior */
  Gerrit.URLEncodingBehavior = {
    /**
     * Pretty-encodes a URL. Double-encodes the string, and then replaces
     *   benevolent characters for legibility.
     */
    encodeURL(url, replaceSlashes) {
      // @see Issue 4255 regarding double-encoding.
      let output = encodeURIComponent(encodeURIComponent(url));
      // @see Issue 4577 regarding more readable URLs.
      output = output.replace(/%253A/g, ':');
      output = output.replace(/%2520/g, '+');
      if (replaceSlashes) {
        output = output.replace(/%252F/g, '/');
      }
      return output;
    },
  };
})(window);
</script>