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CURLOPT_SASL_IR(3)	    Library Functions Manual	      CURLOPT_SASL_IR(3)

NAME
     CURLOPT_SASL_IR - send initial response in first packet

SYNOPSIS
     #include <curl/curl.h>

     CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SASL_IR, long enable);

DESCRIPTION
     Pass  a  long.  If  the  value is 1, curl sends the initial response to the
     server in the first authentication packet in order to reduce the number  of
     ping  pong  requests.  Only applicable to the following supporting SASL au-
     thentication mechanisms:

     * Login * Plain * GSSAPI * NTLM * OAuth 2.0

     Note: Whilst IMAP supports this option there is no need to  explicitly  set
     it,  as  libcurl  can determine the feature itself when the server supports
     the SASL-IR CAPABILITY.

DEFAULT
     0

PROTOCOLS
     This functionality affects imap and smtp

EXAMPLE
     int main(void)
     {
       CURL *curl = curl_easy_init();
       if(curl) {
	 CURLcode result;
	 curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
	 curl_easy_setopt(curl, CURLOPT_SASL_IR, 1L);
	 result = curl_easy_perform(curl);
	 curl_easy_cleanup(curl);
       }
     }

AVAILABILITY
     Added in curl 7.31.0

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_MAIL_AUTH(3), CURLOPT_MAIL_FROM(3), CURLOPT_SASL_AUTHZID(3)

libcurl 			   2026-06-11		      CURLOPT_SASL_IR(3)

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