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CURLOPT_PROXY_CAINFO(3) Library Functions Manual CURLOPT_PROXY_CAINFO(3) NAME CURLOPT_PROXY_CAINFO - path to proxy Certificate Authority (CA) bundle SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAINFO, char *path); DESCRIPTION This option is for connecting to an HTTPS proxy, not an HTTPS server. Pass a char pointer to a null-terminated string naming a file holding one or more certificates to verify the HTTPS proxy with. If CURLOPT_PROXY_SSL_VERIFYPEER(3) is zero and you avoid verifying the server's certificate, CURLOPT_PROXY_CAINFO(3) need not even indicate an ac- cessible file. This option is by default set to the system path where libcurl's CA cer- tificate bundle is assumed to be stored, as established at build time. 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 and switches back to internal default. The default value for this can be figured out with CURLINFO_CAINFO(3). DEFAULT Built-in system specific PROTOCOLS This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. All TLS backends support this option. EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); /* using an HTTPS proxy */ curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy.example:443"); curl_easy_setopt(curl, CURLOPT_PROXY_CAINFO, "/etc/certs/cabundle.pem"); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } NOTES For TLS backends that do not support certificate files, the CUR- LOPT_PROXY_CAINFO(3) option is ignored. Refer to https://curl.se/docs/ssl-compared.html 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_CAINFO(3), CURLOPT_CAINFO_BLOB(3), CURLOPT_CAPATH(3), CUR- LOPT_PROXY_CAINFO_BLOB(3), CURLOPT_PROXY_CAPATH(3), CURLOPT_PROXY_SSL_VERI- FYHOST(3), CURLOPT_PROXY_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3), CUR- LOPT_SSL_VERIFYPEER(3) libcurl 2026-06-11 CURLOPT_PROXY_CAINFO(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | NOTES | AVAILABILITY | RETURN VALUE | SEE ALSO
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