How do I extract parameters from an HTTP response header string?

Question

I need to authenticate against a proxy server, and after the first HTTP request the I need to parse the proxy-authenticate header string to get the relevant values.

The response headers look something like this,

{ 'content-type': 'text/plain',
  'proxy-authenticate': 'Digest realm="zippy", qop="auth",nonce="c1e1c76b5df5a8cdc921b48d6a7b5493", algorithm="MD5", stale="false"',
   date: 'Thu, 21 Apr 2016 00:19:28 GMT',
   connection: 'close',
  'transfer-encoding': 'chunked' }

I want to extract the proxy-authenticate parameters (ie realm, qop, etc.), from the string.

It seems like there must be some super simple way to do this, but I'm just not finding it.

Answer 1

Simply extract your key from the JSON, and split the value by , . Then again split each value of resulting array using = .

$(document).ready(function() {
  var data = {
    'content-type': 'text/plain',
    'proxy-authenticate': 'Digest realm="zippy", qop="auth",nonce="c1e1c76b5df5a8cdc921b48d6a7b5493", algorithm="MD5", stale="false"',
    date: 'Thu, 21 Apr 2016 00:19:28 GMT',
    connection: 'close',
    'transfer-encoding': 'chunked'
  };

  var header = data['proxy-authenticate'];
  var contents = header.split(',');

  var pairs = {};
  $.each(contents, function(index, value) {

    var pair = value.split('=');
    pairs[pair[0]] = pair[1];
  });

  $('div').html(JSON.stringify(pairs));
});

Here is a demo .