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Viewing File: CURLOPT_USERPWD.3

.\" generated by cd2nroff 0.1 from CURLOPT_USERPWD.md
.TH CURLOPT_USERPWD 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_USERPWD \- username and password to use in authentication
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERPWD, char *userpwd);
.fi
.SH DESCRIPTION
Pass a char pointer as parameter, pointing to a null\-terminated login details
string for the connection. The format of which is: [username]:[password].

When using Kerberos V5 authentication with a Windows based server, you should
specify the username part with the domain name in order for the server to
successfully obtain a Kerberos Ticket. If you do not then the initial part of
the authentication handshake may fail.

When using NTLM, the username can be specified simply as the username without
the domain name should the server be part of a single domain and forest.

To specify the domain name use either Down\-Level Logon Name or UPN (User
Principal Name) formats. For example \fBEXAMPLE\user\fP and \fBuser@example.com\fP
respectively.

Some HTTP servers (on Windows) support inclusion of the domain for Basic
authentication as well.

When using HTTP and \fICURLOPT_FOLLOWLOCATION(3)\fP, libcurl might perform several
requests to possibly different hosts. libcurl only sends this user and
password information to hosts using the initial hostname (unless
\fICURLOPT_UNRESTRICTED_AUTH(3)\fP is set), so if libcurl follows redirects to other
hosts, it does not send the user and password to those. This is enforced to
prevent accidental information leakage.

Use \fICURLOPT_HTTPAUTH(3)\fP to specify the authentication method for HTTP
based connections or \fICURLOPT_LOGIN_OPTIONS(3)\fP to control IMAP, POP3 and
SMTP options.

The user and password strings are not URL decoded, so there is no way to send
in a username containing a colon using this option. Use \fICURLOPT_USERNAME(3)\fP
for that, or include it in the URL.

The application does not have to keep the string around after setting this
option.

Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

    curl_easy_setopt(curl, CURLOPT_USERPWD, "clark:kent");

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.1
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_PASSWORD (3),
.BR CURLOPT_PROXYUSERPWD (3),
.BR CURLOPT_USERNAME (3)
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