Figure 1

(a) Basic HTTP; (b) this message is sent to the URL specified in resource; (c) information returned by the server.

(a) 	HEAD /resource HTTP/1.0
 /* a blank line */

(b)	HEAD /~ad/index.html HTTP/1.0
 /* a blank line */

(c)	HTTP/1.0 200 Document follows
 MIME-Version: 1.0
 Server: CERN/3.0
 Date: Monday, 27-May-96 00:05:27 GMT
 Content-Type: text/html
 Content-Length: 2102
 Last-Modified: Friday, 24-May-96 02:38:24 GMT