index.js
function createHeaderGetter (str) {
  var name = str.toLowerCase()

  return function (req, res) {
    // set appropriate Vary header
    vary(res, str)

    // get header
    var header = req.headers[name]

    if (!header) {
      return undefined
    }

    // multiple headers get joined with comma by node.js core
    var index = header.indexOf(',')

    // return first value
    return index !== -1
      ? header.substr(0, index).trim()
      : header.trim()
  }
}
function createHeaderGetter (str) {
  var name = str.toLowerCase()

  return function (req, res) {
    // set appropriate Vary header
    vary(res, str)

    // get header
    var header = req.headers[name]

    if (!header) {
      return undefined
    }

    // multiple headers get joined with comma by node.js core
    var index = header.indexOf(',')

    // return first value
    return index !== -1
      ? header.substr(0, index).trim()
      : header.trim()
  }
}
function createHeaderGetter ( str ) { var name = str . toLowerCase ( ) return function ( req , res ) { // set appropriate Vary header vary ( res , str ) // get header var header = req . headers [ name ] if ( ! header ) { return undefined } // multiple headers get joined with comma by node.js core var index = header . indexOf ( ',' ) // return first value return index !== - 1 ? header . substr ( 0 , index ) . trim ( ) : header . trim ( ) } }
Create a getter for the given header name.
Create a getter for the given header name .