First iteration of code outline
Moving file into listing directory.
First iteration of code outline
Fixing how headers are set on the response
renaming res to req.
Separating into listing 6.1 and 6.2
Adding new listing 6.3
Adding framework for listing 6.5
Updating cors.js to match the book.
Moving listings up by one number.
Removing an extra semicolon
Updating start method in listing 6.4
Updating listing-6.5. Setting the ACAO header to *
Adding base listing for 6.6
Adding the createWhitelistValidator function
Adding whitelist option
Adding listing-6.8, validating origin
Resetting the headers variable on each request
Adding listing 6.9
Adding listing 6.10