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CURLOPT_DO...VERIFYHOST(3)  Library Functions Manual  CURLOPT_DO...VERIFYHOST(3)

NAME
     CURLOPT_DOH_SSL_VERIFYHOST - verify the hostname in the DoH SSL certificate

SYNOPSIS
     #include <curl/curl.h>

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

DESCRIPTION
     Pass  a  long  set  to 2L as asking curl to verify the DoH (DNS-over-HTTPS)
     server's certificate name fields against the hostname.

     This option is the DoH equivalent of CURLOPT_SSL_VERIFYHOST(3) and only af-
     fects requests to the DoH server.

     When CURLOPT_DOH_SSL_VERIFYHOST(3) is 2, the SSL  certificate  provided  by
     the DoH server must indicate that the server name is the same as the server
     name to which you meant to connect to, or the connection fails.

     curl  considers  the DoH server the intended one when the Common Name field
     or a Subject Alternate Name field in the certificate matches  the	hostname
     in the DoH URL to which you told curl to connect.

     When  the	verify	value is set to 1L it is treated the same as 2L. However
     for consistency with the other VERIFYHOST options we suggest use 2 and  not
     1.

     When  the	verify value is set to 0L, the connection succeeds regardless of
     the names used in the certificate. Use that ability with caution.

     See also CURLOPT_DOH_SSL_VERIFYPEER(3) to verify the digital  signature  of
     the DoH server certificate.

DEFAULT
     2

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");

	 curl_easy_setopt(curl, CURLOPT_DOH_URL,
			  "https://cloudflare-dns.com/dns-query");

	 /* Disable hostname verification of the DoH server */
	 curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYHOST, 0L);

	 result = curl_easy_perform(curl);
	 curl_easy_cleanup(curl);
       }
     }

AVAILABILITY
     Added in curl 7.76.0

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_DOH_SSL_VERIFYPEER(3),    CURLOPT_PROXY_SSL_VERIFYHOST(3),     CUR-
     LOPT_PROXY_SSL_VERIFYPEER(3),  CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERI-
     FYPEER(3)

libcurl 			   2026-06-11	      CURLOPT_DO...VERIFYHOST(3)

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