IN THIS APPENDIX
What Is HTTP?
PHP Programming Libraries for HTTP Work
Understanding an HTTP Transaction
HTTP Client Methods
What Comes Back: Server Response Codes
Identifying Clients and Servers
Fetching Content from an HTTP Source
Cookies: Preserving State and a Tasty Treat
Security and Authorization
Client-Side Caching of HTTP Content
In this appendix we'll discuss the HTTP standard from the perspective of a PHP programmer, with a look at the functions and libraries you might use.