CURLOPT_TLSAUTH_USERNAME(3)                           Library Functions Manual

NAME
       CURLOPT_TLSAUTH_USERNAME - username to use for TLS authentication

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_USERNAME, char *user);

DESCRIPTION
       Deprecated option. It serves no purpose anymore.

       Pass a char pointer as parameter, which should point to the
       null-terminated username to use for the TLS authentication method
       specified with the CURLOPT_TLSAUTH_TYPE(3) option. Requires that the
       CURLOPT_TLSAUTH_PASSWORD(3) option also be set.

       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.

       This feature relies on TLS-SRP which does not work with TLS 1.3.

DEFAULT
       NULL

DEPRECATED
       This option was deprecated in 8.22.0.

PROTOCOLS
       This functionality affects  all TLS based protocols: HTTPS, FTPS,
       IMAPS, POP3S, SMTPS etc. only

       This option works only with the following TLS backends: GnuTLS and
       OpenSSL

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode result;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
           curl_easy_setopt(curl, CURLOPT_TLSAUTH_TYPE, "SRP");
           curl_easy_setopt(curl, CURLOPT_TLSAUTH_USERNAME, "user");
           curl_easy_setopt(curl, CURLOPT_TLSAUTH_PASSWORD, "secret");
           result = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY
       Added in curl 7.21.4

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_TLSAUTH_PASSWORD(3), CURLOPT_TLSAUTH_TYPE(3)

libcurl                           2026-09-02       CURLOPT_TLSAUTH_USERNAME(3)