.\" Modified Fri Aug 21 23:00:00 1999 by David A. Wheeler (dwheeler@dwheeler.com)
.\" Modified Tue Mar 14 2000 by David A. Wheeler (dwheeler@dwheeler.com)
.\"
-.TH URI 7 2013-05-18 "Linux" "Linux Programmer's Manual"
+.TH URI 7 2017-09-15 "Linux" "Linux Programmer's Manual"
.SH NAME
uri, url, urn \- uniform resource identifier (URI), including a URL or URN
.SH SYNOPSIS
.PP
URIs are the standard way to name hypertext link destinations
for tools such as web browsers.
-The string "http://www.kernelnotes.org" is a URL (and thus it
+The string "http://www.kernel.org" is a URL (and thus it
is also a URI).
Many people use the term URL loosely as a synonym for URI
(though technically URLs are a subset of URIs).
is the name of the host computer, either its name as determined by DNS
or an IP address (numbers separated by periods).
Thus the URI
-<http://fred:fredpassword@xyz.com:8080/>
-logs into a web server on host xyz.com
+<http://fred:fredpassword@example.com:8080/>
+logs into a web server on host example.com
as fred (using fredpassword) using port 8080.
Avoid including a password in a URI if possible because of the many
security risks of having a password written down.
.PP
Unreserved characters may be included in a URI.
Unreserved characters
-include upper and lower case English letters,
+include uppercase and lowercase English letters,
decimal digits, and the following
limited set of punctuation marks and symbols:
.IP
All other characters must be escaped.
An escaped octet is encoded as a character triplet, consisting of the
percent character "%" followed by the two hexadecimal digits
-representing the octet code (you can use upper or lower case letters
+representing the octet code (you can use uppercase or lowercase letters
for the hexadecimal digits).
For example, a blank space must be escaped
as "%20", a tab character as "%09", and the "&" as "%26".
use the %HH encoding for unsafe octets.
.SS Writing a URI
When written, URIs should be placed inside double quotes
-(e.g., "http://www.kernelnotes.org"),
+(e.g., "http://www.kernel.org"),
enclosed in angle brackets (e.g., <http://lwn.net>),
or placed on a line by themselves.
A warning for those who use double-quotes:
.UR http://www.ietf.org\:/rfc\:/rfc2396.txt
(IETF RFC\ 2396)
.UE ,
-.UR http://www.w3.org\:/TR\:/REC-html40
+.UR http://www.w3.org\:/TR\:/REC\-html40
(HTML 4.0)
.UE .
.SH NOTES
.BR man2html (1),
.BR mailaddr (7),
.BR utf-8 (7)
-
+.PP
.UR http://www.ietf.org\:/rfc\:/rfc2255.txt
IETF RFC\ 2255
.UE