Function normalizeStripHeaders

lib/handler/redirect-handler.js:176–194

(headers, optionName)

// https://tools.ietf.org/html/rfc7231#section-6.4
function normalizeStripHeaders (headers, optionName) {
  if (headers == null) {
    return null
  }

  if (!Array.isArray(headers)) {
    throw new InvalidArgumentError(`${optionName} must be an array`)
  }

  const normalized = new Set()
  for (const header of headers) {
    if (typeof header !== 'string') {
      throw new InvalidArgumentError(`${optionName} must contain header names`)
    }

    normalized.add(util.headerNameToString(header))
  }
  return normalized
}

function cleanRequestHeaders (headers, removeContent, unknownOrigin, stripHeaders, stripHeadersOnCrossOrigin) {
  const ret = []