function Caseless (dict) {

this.dict = dict || {}

} Caseless.prototype.set = function (name, value, clobber) {

if (typeof name === 'object') {
  for (var i in name) {
    this.set(i, name[i], value)
  }
} else {
  if (typeof clobber === 'undefined') clobber = true
  var has = this.has(name)

  if (!clobber && has) this.dict[has] = this.dict[has] + ',' + value
  else this.dict[has || name] = value
  return has
}

} Caseless.prototype.has = function (name) {

var keys = Object.keys(this.dict)
  , name = name.toLowerCase()
  ;
for (var i=0;i<keys.length;i++) {
  if (keys[i].toLowerCase() === name) return keys[i]
}
return false

} Caseless.prototype.get = function (name) {

name = name.toLowerCase()
var result, _key
var headers = this.dict
Object.keys(headers).forEach(function (key) {
  _key = key.toLowerCase()
  if (name === _key) result = headers[key]
})
return result

} Caseless.prototype.swap = function (name) {

var has = this.has(name)
if (!has) throw new Error('There is no header than matches "'+name+'"')
this.dict[name] = this.dict[has]
delete this.dict[has]

} Caseless.prototype.del = function (name) {

var has = this.has(name)
return delete this.dict[has || name]

}

module.exports = function (dict) {return new Caseless(dict)} module.exports.httpify = function (resp, headers) {

var c = new Caseless(headers)
resp.setHeader = function (key, value, clobber) {
  if (typeof value === 'undefined') return
  return c.set(key, value, clobber)
}
resp.hasHeader = function (key) {
  return c.has(key)
}
resp.getHeader = function (key) {
  return c.get(key)
}
resp.removeHeader = function (key) {
  return c.del(key)
}
resp.headers = c.dict
return c

}