check-ethereum-scanner/Ethereum-Renounced-Contract-Scanner/node_modules/xhr-request/lib/ensure-header.js

Safety checks for new Ethereum tokens

module.exports = ensureHeader
function ensureHeader (headers, key, value) {
  var lower = key.toLowerCase()
  if (!headers[key] && !headers[lower]) {
    headers[key] = value
  }
}