November 1999
Intermediate to advanced
832 pages
19h 28m
English
Content preview from Practical Programming in Tcl & Tk, Third Edition
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Fetching a URL with HTTP
The HyperText Transport Protocol (HTTP) is the protocol used on the World Wide Web. This section presents a procedure to fetch pages or images from a server on the Web. Items in the Web are identified with a Universal Resource Location (URL) that specifies a host, port, and location on the host. The basic outline of HTTP is that a client sends a URL to a server, and the server responds with some header information and some content data. The header information describes the content, which can be hypertext, images, postscript, and more.
Example 17-5 Opening a connection to an HTTP server.
proc Http_Open {url} { global http if {![regexp -nocase {^(http://)?([^:/]+)(:([0-9])+)?(/.*)}\ $url x protocol server y port path]} ... |
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