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curl/docs/libcurl/opts/CURLOPT_DOH_URL.3
Daniel Stenberg 83cc966708
man pages: switch to https://example.com URLs
Since HTTPS is "the new normal", this update changes a lot of man page
examples to use https://example.com instead of the previous "http://..."

Closes #5969
2020-09-17 16:28:18 +02:00

72 lines
2.8 KiB
Groff

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.TH CURLOPT_DOH_URL 3 "18 Jun 2018" "libcurl 7.62.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_DOH_URL \- provide the DNS-over-HTTPS URL
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
.SH DESCRIPTION
Pass in a pointer to a \fIURL\fP 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 doesn't validate the syntax or use this variable until the transfer is
issued. Even if you set a crazy value here, \fIcurl_easy_setopt(3)\fP will
still return \fICURLE_OK\fP.
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 \fICURLOPT_RESOLVE(3)\fP.
Disable DOH use again by setting this option to NULL.
.SH DEFAULT
NULL - there is no default DOH URL. If this option isn't set, libcurl will use
the default name resolver.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
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);
}
.fi
.SH AVAILABILITY
Added in 7.62.0
.SH RETURN VALUE
Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient
heap space.
Note that \fIcurl_easy_setopt(3)\fP won't 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.
.SH "SEE ALSO"
.BR CURLOPT_VERBOSE "(3), " CURLOPT_RESOLVE "(3), "