Generating base64-encoded Authorization headers in a variety of languages

example.cs

httpClient.DefaultRequestHeaders.Authorization = 
    new AuthenticationHeaderValue(
        "Basic", 
        Convert.ToBase64String(
            System.Text.ASCIIEncoding.ASCII.GetBytes(
                string.Format("{0}:{1}", username, password))));

example.php

$header = "Authorization: Basic " . base64_encode($username . ':' . $password);

example.py

base64string = base64.encodestring('%s:%s' % (username, password)).replace('\n', '')
header = ("Authorization: Basic %s" % base64string)   

example.rb

$header = 'Authorization: Basic ' + Base64.encode64( username + ':' + password ).chomp

jquery.js

$.ajax
({
  type: "GET",
  url: "https://www.example.com",
  dataType: 'json',
  headers: {
    "Authorization", btoa(username + ":" + password)
  },
  data: '{}',
  success: function (){
   ...
  }
});

node.js

var username = 'Test';
var password = '123';
var auth = 'Basic ' + new Buffer(username + ':' + password).toString('base64');

var header = {'Host': 'www.example.com', 'Authorization': auth};
var request = client.request('GET', '/', header);

In Bash:

username='Test'
password='123'
credentials="$(echo -n "$username:$password" | base64)"
header="Authorization: Basic $credentials"