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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_CAINFO 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_CAINFO \- path to Certificate Authority (CA) bundle
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO, char *path);
+.SH DESCRIPTION
+Pass a char * to a zero terminated string naming a file holding one or more
+certificates to verify the peer with.
+
+If \fICURLOPT_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the
+server's certificate, \fICURLOPT_CAINFO(3)\fP need not even indicate an
+accessible file.
+
+This option is by default set to the system path where libcurl's cacert bundle
+is assumed to be stored, as established at build time.
+
+If curl is built against the NSS SSL library, the NSS PEM PKCS#11 module
+(libnsspem.so) needs to be available for this option to work properly.
+Starting with curl-7.55.0, if both \fICURLOPT_CAINFO(3)\fP and
+\fICURLOPT_CAPATH(3)\fP are unset, NSS-linked libcurl tries to load
+libnssckbi.so, which contains a more comprehensive set of trust information
+than supported by nss-pem, because libnssckbi.so also includes information
+about distrusted certificates.
+
+(iOS and macOS) When curl uses Secure Transport this option is supported. If
+the option is not set, then curl will use the certificates in the system and
+user Keychain to verify the peer.
+
+(Schannel) This option is supported for Schannel in Windows 7 or later but we
+recommend not using it until Windows 8 since it works better starting then.
+If the option is not set, then curl will use the certificates in the Windows'
+store of root certificates (the default for Schannel).
+
+The application does not have to keep the string around after setting this
+option.
+.SH DEFAULT
+Built-in system specific. When curl is built with Secure Transport or
+Schannel, this option is not set by default.
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+  curl_easy_setopt(curl, CURLOPT_CAINFO, "/etc/certs/cabundle.pem");
+  ret = curl_easy_perform(curl);
+  curl_easy_cleanup(curl);
+}
+.fi
+.SH AVAILABILITY
+For the SSL engines that don't support certificate files the CURLOPT_CAINFO
+option is ignored. Schannel support added in libcurl 7.60.
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_CAPATH "(3), "
+.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "