CURLOPT_DOH_URL(3)

1CURLOPT_DOH_URL(3)         curl_easy_setopt options         CURLOPT_DOH_URL(3)
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NAME

6       CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL
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SYNOPSIS

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

14       Pass  in  a pointer to a URL for the DOH server to use for name resolv‐
15       ing. The parameter should be a char * to a zero terminated string which
16       must  be URL-encoded in the following format: "https://host:port/path".
17       It MUST specify a HTTPS URL.
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19       libcurl doesn't validate the syntax or  use  this  variable  until  the
20       transfer   is   issued.   Even   if   you   set  a  crazy  value  here,
21       curl_easy_setopt(3) will still return CURLE_OK.
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23       curl sends POST requests to the given DNS-over-HTTPS URL.
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25       To find the DOH server itself, which might be specified using  a  name,
26       libcurl  will  use  the default name lookup function. You can bootstrap
27       that  by  providing  the  address  for  the  DOH   server   with   CUR‐
28       LOPT_RESOLVE(3).
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30       Disable DOH use again by setting this option to NULL.
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DEFAULT

33       NULL  -  there is no default DOH URL. If this option isn't set, libcurl
34       will use the default name resolver.
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PROTOCOLS

37       All
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EXAMPLE

40       CURL *curl = curl_easy_init();
41       if(curl) {
42         curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
43         curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com");
44         curl_easy_perform(curl);
45       }
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AVAILABILITY

48       Added in 7.62.0
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RETURN VALUE

51       Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was  insuf‐
52       ficient heap space.
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54       Note  that curl_easy_setopt(3) won't actually parse the given string so
55       given a bad DOH URL, curl will not detect a problem until it  tries  to
56       resolve a name with it.
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