CURLOPT_DOH_URL(3) curl_easy_setopt options CURLOPT_DOH_URL(3)
NAME
CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
DESCRIPTION
Pass in a pointer to a URL for the DoH server to use for name resolv-
ing. The parameter should be a char * to a null-terminated string which
must be URL-encoded in the following format: "https://host:port/path".
It MUST specify a HTTPS URL.
libcurl does not validate the syntax or use this variable until the
transfer is issued. Even if you set a crazy value here, curl_easy_se-
topt(3) will still return CURLE_OK.
curl sends POST requests to the given DNS-over-HTTPS URL.
To find the DoH server itself, which might be specified using a name,
libcurl will use the default name lookup function. You can bootstrap
that by providing the address for the DoH server with CURLOPT_RE-
SOLVE(3).
Disable DoH use again by setting this option to NULL.
INHERIT OPTIONS
DoH lookups use SSL and some SSL settings from your transfer are inher-
ited, like CURLOPT_SSL_CTX_FUNCTION(3).
The hostname and peer certificate verification settings are not inher-
ited but can be controlled separately via CURLOPT_DOH_SSL_VERIFYHOST(3)
and CURLOPT_DOH_SSL_VERIFYPEER(3).
A set CURLOPT_OPENSOCKETFUNCTION(3) callback is not inherited.
DEFAULT
NULL - there is no default DoH URL. If this option is not set, libcurl
will use the default name resolver.
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com");
curl_easy_perform(curl);
}
AVAILABILITY
Added in 7.62.0
RETURN VALUE
Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insuf-
ficient heap space.
Note that curl_easy_setopt(3) will not actually parse the given string
so given a bad DoH URL, curl will not detect a problem until it tries
to resolve a name with it.
SEE ALSO
CURLOPT_VERBOSE(3), CURLOPT_RESOLVE(3),
libcurl 7.81.0 November 26, 2021 CURLOPT_DOH_URL(3)
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