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CURLOPT_PROXY_SSL_VERIFYPEER(3)

CURLOPT_PR...VERIFYPEER(3) curl_easy_setopt options CURLOPT_PR...VERIFYPEER(3)

NAME
       CURLOPT_PROXY_SSL_VERIFYPEER - verify the proxy's SSL certificate

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER,
                                 long verify);

DESCRIPTION
       Pass a long as parameter set to 1L to enable or 0L to disable.

       This  option  tells  curl  to  verifies  the  authenticity of the HTTPS
       proxy's certificate. A value of 1 means curl verifies; 0  (zero)  means
       it does not.

       This is the proxy version of CURLOPT_SSL_VERIFYPEER(3) that is used for
       ordinary HTTPS servers.

       When  negotiating  a TLS or SSL connection, the server sends a certifi‐
       cate indicating its identity. Curl verifies whether the certificate  is
       authentic,  i.e. that you can trust that the server is who the certifi‐
       cate says it is.  This trust is based on a chain of digital signatures,
       rooted in certification authority (CA) certificates you  supply.   curl
       uses  a  default bundle of CA certificates (the path for that is deter‐
       mined at build time) and you can specify  alternate  certificates  with
       the  CURLOPT_PROXY_CAINFO(3)  option or the CURLOPT_PROXY_CAPATH(3) op‐
       tion.

       When CURLOPT_PROXY_SSL_VERIFYPEER(3) is enabled, and  the  verification
       fails to prove that the certificate is authentic, the connection fails.
       When the option is zero, the peer certificate verification succeeds re‐
       gardless.

       Authenticating  the  certificate  is  not  enough  to be sure about the
       server. You typically also want to ensure that the server is the server
       you mean to be talking  to.   Use  CURLOPT_PROXY_SSL_VERIFYHOST(3)  for
       that.  The check that the host name in the certificate is valid for the
       host name you are connecting to  is  done  independently  of  the  CUR‐
       LOPT_PROXY_SSL_VERIFYPEER(3) option.

       WARNING:  disabling  verification of the certificate allows bad guys to
       man-in-the-middle the communication without you knowing  it.  Disabling
       verification  makes  the communication insecure. Just having encryption
       on a transfer is not enough as you cannot be sure that you are communi‐
       cating with the correct end-point.

DEFAULT
       1

PROTOCOLS
       All

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

         /* Set the default value: strict certificate check please */
         curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYPEER, 1L);

         curl_easy_perform(curl);
       }

AVAILABILITY
       Added in 7.52.0

       If built TLS enabled.

RETURN VALUE
       Returns CURLE_OK if the option is supported,  and  CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_PROXY_SSL_VERIFYHOST(3),     CURLOPT_SSL_VERIFYPEER(3),    CUR‐
       LOPT_SSL_VERIFYHOST(3),

libcurl 7.86.0                   May 17, 2022       CURLOPT_PR...VERIFYPEER(3)
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