Update libcurl

Engine/lib/curl/docs/cmdline-opts/range.d

@@ -0,0 +1,53 @@
+c: Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: range
+Short: r
+Help: Retrieve only the bytes within RANGE
+Arg: <range>
+Protocols: HTTP FTP SFTP FILE
+Category: http ftp sftp file
+Example: --range 22-44 $URL
+Added: 4.0
+See-also: continue-at append
+---
+Retrieve a byte range (i.e. a partial document) from an HTTP/1.1, FTP or SFTP
+server or a local FILE. Ranges can be specified in a number of ways.
+.RS
+.TP 10
+.B 0-499
+specifies the first 500 bytes
+.TP
+.B 500-999
+specifies the second 500 bytes
+.TP
+.B -500
+specifies the last 500 bytes
+.TP
+.B 9500-
+specifies the bytes from offset 9500 and forward
+.TP
+.B 0-0,-1
+specifies the first and last byte only(*)(HTTP)
+.TP
+.B 100-199,500-599
+specifies two separate 100-byte ranges(*) (HTTP)
+.RE
+.IP
+(*) = NOTE that this will cause the server to reply with a multipart
+response, which will be returned as-is by curl! Parsing or otherwise
+transforming this response is the responsibility of the caller.
+
+Only digit characters (0-9) are valid in the 'start' and 'stop' fields of the
+'start-stop' range syntax. If a non-digit character is given in the range,
+the server's response will be unspecified, depending on the server's
+configuration.
+
+You should also be aware that many HTTP/1.1 servers do not have this feature
+enabled, so that when you attempt to get a range, you will instead get the
+whole document.
+
+FTP and SFTP range downloads only support the simple 'start-stop' syntax
+(optionally with one of the numbers omitted). FTP use depends on the extended
+FTP command SIZE.
+
+If this option is used several times, the last one will be used.