CURLOPT_SSL_CTX_DATA - custom pointer passed to ssl_ctx callback
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CTX_DATA, void *pointer);
Data pointer to pass to the ssl context callback set by the option CURLOPT_SSL_CTX_FUNCTION, this is the pointer you'll get as third parameter.
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
Added in 7.11.0 for OpenSSL. Added in 7.42.0 for wolfSSL/CyaSSL. Other SSL backends not supported.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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