HTTP 1.1 Request Headers
Accept: MIME types the browser can handle
Accept-Charset: Character sets the browser can handle
Accept-Encoding: Encoding (e.g gzip)
Accept-Language: English (en), etc.
Authorization: User ID/password
Cache-Control: For proxy servers.
Connection: Can the browser keep connections alive?
Content-Length: of POSTed data
Content-Type: MIME encoding
Cookie: Cookies previously received from this site.
Expect: Browser wishes to attach a document
From: email address of requester.
Host: host/port information on original URL