curl / libcurl / API / curl_easy_setopt / CURLOPT_DOH_URL



CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL


#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);


Pass in a pointer to a URL for the DoH server to use for name resolving. 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_setopt 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_RESOLVE.

Disable DoH use again by setting this option to NULL.

Inherit options

DoH lookups use SSL and some SSL settings from your transfer are inherited, like CURLOPT_SSL_CTX_FUNCTION.

The hostname and peer certificate verification settings are not inherited but can be controlled separately via CURLOPT_DOH_SSL_VERIFYHOST and CURLOPT_DOH_SSL_VERIFYPEER.

A set CURLOPT_OPENSOCKETFUNCTION callback is not inherited.


NULL - there is no default DoH URL. If this option is not set, libcurl will use the default name resolver.




CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "");
  curl_easy_setopt(curl, CURLOPT_DOH_URL, "");


Added in 7.62.0

Return value

Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

Note that curl_easy_setopt 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


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