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CURLOPT_PROXY_SSLKEY(3) Library Functions Manual CURLOPT_PROXY_SSLKEY(3) NAME CURLOPT_PROXY_SSLKEY - private key file for HTTPS proxy client cert SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEY, char *keyfile); DESCRIPTION Pass a pointer to a null-terminated string as parameter. The string should be the filename of your private key used for connecting to the HTTPS proxy. The default format is "PEM" and can be changed with CUR- LOPT_PROXY_SSLKEYTYPE(3). (Windows, iOS and macOS) This option is ignored by Secure Transport and Schannel SSL backends because they expect the private key to be already present in the key chain or PKCS#12 file containing the certificate. 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. DEFAULT NULL PROTOCOLS This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. This option works only with the following TLS backends: OpenSSL, Schan- nel, mbedTLS and wolfSSL EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy"); curl_easy_setopt(curl, CURLOPT_PROXY_SSLCERT, "client.pem"); curl_easy_setopt(curl, CURLOPT_PROXY_SSLKEY, "key.pem"); curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "s3cret"); res = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.52.0 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_PROXY_SSLCERT(3), CURLOPT_PROXY_SSLKEYTYPE(3), CUR- LOPT_SSLCERT(3), CURLOPT_SSLKEY(3), CURLOPT_SSLKEYTYPE(3) libcurl 2025-06-03 CURLOPT_PROXY_SSLKEY(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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