CURLOPT_SASL_IR (3) - Linux Man Pages
CURLOPT_SASL_IR: enable sending initial response in first packet
NAMECURLOPT_SASL_IR - enable sending initial response in first packet
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SASL_IR, long enable);
DESCRIPTIONPass a long. If the value is 1, curl will send 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 authentication 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.
PROTOCOLSIMAP, POP3 and SMTP
AVAILABILITYAdded in 7.31.0
RETURN VALUEReturns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSOCURLOPT_MAIL_AUTH(3), CURLOPT_MAIL_FROM(3),