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curl/docs/libcurl/opts/CURLOPT_URL.3
Dan Fandrich 455bfedc84 opts: fixed a few typos
2014-06-18 00:54:30 +02:00

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.\" **************************************************************************
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.TH CURLOPT_URL 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_URL \- provide the URL to use in the reqest
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_URL, char *URL);
.SH DESCRIPTION
Pass in a pointer to the \fIURL\fP to work with. The parameter should be a
char * to a zero terminated string which must be URL-encoded in the following
format:
scheme://host:port/path
For a greater explanation of the format please see RFC3986.
libcurl doesn't validate the syntax or use this variable until the transfer is
issued. Even if you set a crazy value here, \fIcurl_easy_setopt(3)\fP will
still return \fICURLE_OK\fP.
If the given URL lacks the scheme (such as "http://" or "ftp://" etc) then
libcurl will attempt to resolve the protocol based on one of the following
given host names: HTTP, FTP, DICT, LDAP, IMAP, POP3 or SMTP
Should the protocol, either that specified by the scheme or deduced by libcurl
from the host name, not be supported by libcurl then
\fICURLE_UNSUPPORTED_PROTOCOL\fP will be returned from either the
\fIcurl_easy_perform(3)\fP or \fIcurl_multi_perform(3)\fP functions when you
call them. Use \fIcurl_version_info(3)\fP for detailed information of which
protocols are supported by the build of libcurl you are using.
The host part of the URL contains the address of the server that you want to
connect to. This can be the fully qualified domain name of the server, the
local network name of the machine on your network or the IP address of the
server or machine represented by either an IPv4 or IPv6 address. For example:
http://www.example.com/
http://hostname/
http://192.168.0.1/
http://[2001:1890:1112:1::20]/
It is also possible to specify the user name, password and any supported login
options as part of the host, for the following protocols, when connecting to
servers that require authentication:
http://user:password@www.example.com
ftp://user:password@ftp.example.com
imap://user:password;options@mail.example.com
pop3://user:password;options@mail.example.com
smtp://user:password;options@mail.example.com
At present only IMAP, POP3 and SMTP support login options as part of the host.
For more information about the login options in URL syntax please see RFC2384,
RFC5092 and IETF draft draft-earhart-url-smtp-00.txt (Added in 7.31.0).
The port is optional and when not specified libcurl will use the default port
based on the determined or specified protocol: 80 for HTTP, 21 for FTP and 25
for SMTP, etc. The following examples show how to specify the port:
http://www.example.com:8080/ - This will connect to a web server using port
8080 rather than 80.
smtp://mail.example.com:587/ - This will connect to a SMTP server on the
alternative mail port.
The path part of the URL is protocol specific and whilst some examples are
given below this list is not conclusive:
.IP HTTP
The path part of a HTTP request specifies the file to retrieve and from what
directory. If the directory is not specified then the web server's root
directory is used. If the file is omitted then the default document will be
retrieved for either the directory specified or the root directory. The exact
resource returned for each URL is entirely dependent on the server's
configuration.
http://www.example.com - This gets the main page from the web server.
http://www.example.com/index.html - This returns the main page by explicitly
requesting it.
http://www.example.com/contactus/ - This returns the default document from
the contactus directory.
.IP FTP
The path part of an FTP request specifies the file to retrieve and from what
directory. If the file part is omitted then libcurl downloads the directory
listing for the directory specified. If the directory is omitted then
the directory listing for the root / home directory will be returned.
ftp://ftp.example.com - This retrieves the directory listing for the root
directory.
ftp://ftp.example.com/readme.txt - This downloads the file readme.txt from the
root directory.
ftp://ftp.example.com/libcurl/readme.txt - This downloads readme.txt from the
libcurl directory.
ftp://user:password@ftp.example.com/readme.txt - This retrieves the readme.txt
file from the user's home directory. When a username and password is
specified, everything that is specified in the path part is relative to the
user's home directory. To retrieve files from the root directory or a
directory underneath the root directory then the absolute path must be
specified by prepending an additional forward slash to the beginning of the
path.
ftp://user:password@ftp.example.com//readme.txt - This retrieves the readme.txt
from the root directory when logging in as a specified user.
.IP SMTP
The path part of a SMTP request specifies the host name to present during
communication with the mail server. If the path is omitted then libcurl will
attempt to resolve the local computer's host name. However, this may not
return the fully qualified domain name that is required by some mail servers
and specifying this path allows you to set an alternative name, such as
your machine's fully qualified domain name, which you might have obtained
from an external function such as gethostname or getaddrinfo.
smtp://mail.example.com - This connects to the mail server at example.com and
sends your local computer's host name in the HELO / EHLO command.
smtp://mail.example.com/client.example.com - This will send client.example.com in
the HELO / EHLO command to the mail server at example.com.
.IP POP3
The path part of a POP3 request specifies the message ID to retrieve. If the
ID is not specified then a list of waiting messages is returned instead.
pop3://user:password@mail.example.com - This lists the available messages for
the user
pop3://user:password@mail.example.com/1 - This retrieves the first message for
the user
.IP IMAP
The path part of an IMAP request not only specifies the mailbox to list (Added
in 7.30.0) or select, but can also be used to check the UIDVALIDITY of the
mailbox, to specify the UID, SECTION (Added in 7.30.0) and PARTIAL octets
(Added in 7.37.0) of the message to fetch and to specify what nessages to
search for (Added in 7.37.0).
imap://user:password@mail.example.com - Performs a top level folder list
imap://user:password@mail.example.com/INBOX - Performs a folder list on the
user's inbox
imap://user:password@mail.example.com/INBOX/;UID=1 - Selects the user's inbox
and fetches message 1
imap://user:password@mail.example.com/INBOX;UIDVALIDITY=50/;UID=2 - Selects
the user's inbox, checks the UIDVALIDITY of the mailbox is 50 and fetches
message 2 if it is
imap://user:password@mail.example.com/INBOX/;UID=3/;SECTION=TEXT - Selects the
user's inbox and fetches the text portion of message 3
imap://user:password@mail.example.com/INBOX/;UID=4/;PARTIAL=0.1024 - Selects
the user's inbox and fetches the first 1024 octets of message 4
imap://user:password@mail.example.com/INBOX?NEW - Selects the user's inbox and
checks for NEW messages
imap://user:password@mail.example.com/INBOX?SUBJECT%20shadows - Selects the
user's inbox and searches for messages containing "shadows" in the subject
line
For more information about the individual components of an IMAP URL please
see RFC5092.
.IP SCP
The path part of a SCP request specifies the file to retrieve and from what
directory. The file part may not be omitted. The file is taken as an absolute
path from the root directory on the server. To specify a path relative to the
user's home directory on the server, prepend ~/ to the path portion. If the
user name is not embedded in the URL, it can be set with the
\fICURLOPT_USERPWD(3)\fP or \fICURLOPT_USERNAME(3)\fP option.
scp://user@example.com/etc/issue - This specifies the file /etc/issue
scp://example.com/~/my-file - This specifies the file my-file in the
user's home directory on the server
.IP SFTP
The path part of a SFTP request specifies the file to retrieve and from what
directory. If the file part is omitted then libcurl downloads the directory
listing for the directory specified. If the path ends in a / then a directory
listing is returned instead of a file. If the path is omitted entirely then
the directory listing for the root / home directory will be returned. If the
user name is not embedded in the URL, it can be set with the
\fICURLOPT_USERPWD(3)\fP or \fICURLOPT_USERNAME(3)\fP option.
sftp://user:password@example.com/etc/issue - This specifies the file
/etc/issue
sftp://user@example.com/~/my-file - This specifies the file my-file in the
user's home directory
sftp://ssh.example.com/~/Documents/ - This requests a directory listing
of the Documents directory under the user's home directory
.IP LDAP
The path part of a LDAP request can be used to specify the: Distinguished
Name, Attributes, Scope, Filter and Extension for a LDAP search. Each field
is separated by a question mark and when that field is not required an empty
string with the question mark separator should be included.
ldap://ldap.example.com/o=My%20Organisation - This will perform a LDAP search
with the DN as My Organisation.
ldap://ldap.example.com/o=My%20Organisation?postalAddress - This will perform
the same search but will only return postalAddress attributes.
ldap://ldap.example.com/?rootDomainNamingContext - This specifies an empty DN
and requests information about the rootDomainNamingContext attribute for an
Active Directory server.
For more information about the individual components of a LDAP URL please
see RFC4516.
.IP RTMP
There's no official URL spec for RTMP so libcurl uses the URL syntax supported
by the underlying librtmp library. It has a syntax where it wants a
traditional URL, followed by a space and a series of space-separated
name=value pairs.
While space is not typically a "legal" letter, libcurl accepts them. When a
user wants to pass in a '#' (hash) character it will be treated as a fragment
and get cut off by libcurl if provided literally. You will instead have to
escape it by providing it as backslash and its ASCII value in hexadecimal:
"\\23".
.IP NOTES
\fICURLOPT_URL(3)\fP is the only option that \fBmust\fP be set before a
transfer is started.
\fICURLOPT_PROTOCOLS(3)\fP can be used to limit what protocols libcurl will
use for this transfer, independent of what libcurl has been compiled to
support. That may be useful if you accept the URL from an external source and
want to limit the accessibility.
.SH DEFAULT
There is no default URL. If this option isn't set, no transfer can be
performed.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
.SH AVAILABILITY
POP3 and SMTP added in 7.31.0
.SH RETURN VALUE
Returns CURLE_OK
.SH "SEE ALSO"
.BR CURLOPT_VERBOSE "(3), " CURLOPT_PROTOCOLS "(3), "
.BR curl_easy_perform "(3)"
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