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CURLOPT_HTTPAUTH(3) curl_easy_setopt options CURLOPT_HTTPAUTH(3)
CURLOPT_HTTPAUTH - HTTP server authentication methods to try
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTPAUTH, long bitmask);
Pass a long as parameter, which is set to a bitmask, to tell libcurl
which authentication method(s) you want it to use speaking to the
The available bits are listed below. If more than one bit is set,
libcurl will first query the site to see which authentication methods
it supports and then pick the best one you allow it to use. For some
methods, this will induce an extra network round-trip. Set the actual
name and password with the CURLOPT_USERPWD(3) option or with the
CURLOPT_USERNAME(3) and the CURLOPT_PASSWORD(3) options.
For authentication with a proxy, see CURLOPT_PROXYAUTH(3).
HTTP Basic authentication. This is the default choice, and the
only method that is in wide-spread use and supported virtually
everywhere. This sends the user name and password over the
network in plain text, easily captured by others.
HTTP Digest authentication. Digest authentication is defined in
RFC2617 and is a more secure way to do authentication over
public networks than the regular old-fashioned Basic method.
HTTP Digest authentication with an IE flavor. Digest
authentication is defined in RFC2617 and is a more secure way to
do authentication over public networks than the regular old-
fashioned Basic method. The IE flavor is simply that libcurl
will use a special "quirk" that IE is known to have used before
version 7 and that some servers require the client to use.
HTTP Bearer token authentication, used primarily in OAuth 2.0
You can set the Bearer token to use with
HTTP Negotiate (SPNEGO) authentication. Negotiate authentication
is defined in RFC 4559 and is the most secure way to perform
authentication over HTTP.
You need to build libcurl with a suitable GSS-API library or
SSPI on Windows for this to work.
HTTP NTLM authentication. A proprietary protocol invented and
used by Microsoft. It uses a challenge-response and hash concept
similar to Digest, to prevent the password from being
You need to build libcurl with either OpenSSL, GnuTLS or NSS
support for this option to work, or build libcurl on Windows
with SSPI support.
NTLM delegating to winbind helper. Authentication is performed
by a separate binary application that is executed when needed.
The name of the application is specified at compile time but is
Note that libcurl will fork when necessary to run the winbind
application and kill it when complete, calling waitpid() to
await its exit when done. On POSIX operating systems, killing
the process will cause a SIGCHLD signal to be raised (regardless
of whether CURLOPT_NOSIGNAL(3) is set), which must be handled
intelligently by the application. In particular, the application
must not unconditionally call wait() in its SIGCHLD signal
handler to avoid being subject to a race condition. This
behavior is subject to change in future versions of libcurl.
This is a convenience macro that sets all bits and thus makes
libcurl pick any it finds suitable. libcurl will automatically
select the one it finds most secure.
This is a convenience macro that sets all bits except Basic and
thus makes libcurl pick any it finds suitable. libcurl will
automatically select the one it finds most secure.
This is a meta symbol. OR this value together with a single
specific auth value to force libcurl to probe for un-restricted
auth and if not, only that single auth algorithm is acceptable.
provides AWS V4 signature authentication on HTTPS header see
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
/* allow whatever auth the server speaks */
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_easy_setopt(curl, CURLOPT_USERPWD, "james:bond");
ret = curl_easy_perform(curl);
Option Added in 7.10.6.
CURLAUTH_DIGEST_IE was added in 7.19.3
CURLAUTH_ONLY was added in 7.21.3
CURLAUTH_NTLM_WB was added in 7.22.0
CURLAUTH_BEARER was added in 7.61.0
CURLAUTH_AWS_SIGV4 was added in 7.74.0
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
not, or CURLE_NOT_BUILT_IN if the bitmask specified no supported
libcurl 7.83.1 September 8, 2021 CURLOPT_HTTPAUTH(3)