(C#) Cloudfare DNS over HTTPS

Cloudflare offers a DNS over HTTPS resolver at: https://cloudflare-dns.com/dns-query

This example demonstrates how to do a DNS lookup for a domain using Cloudfare's HTTPS resolver.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();

// Send the following CURL request:   curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A'

http.Accept = "application/dns-json";

string url = "https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A";

string jsonResp = http.QuickGetStr(url);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("Response Status Code: " + Convert.ToString(http.LastStatus));

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(jsonResp);
json.EmitCompact = false;
Debug.WriteLine(json.Emit());

if (http.LastStatus != 200) {
    Debug.WriteLine("Failed.");
    return;
}

// Sample output...
// (See the parsing code below..)
// 

// {
//   "Status": 0,
//   "TC": false,
//   "RD": true,
//   "RA": true,
//   "AD": false,
//   "CD": false,
//   "Question": [
//     {
//       "name": "chilkat.io.",
//       "type": 1
//     }
//   ],
//   "Answer": [
//     {
//       "name": "chilkat.io.",
//       "type": 1,
//       "TTL": 900,
//       "data": "52.25.83.238"
//     }
//   ]
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

int Status;
bool TC;
bool RD;
bool RA;
bool AD;
bool CD;
int i;
int count_i;
string name;
int type;
int TTL;
string data;
string ipAddr;

Status = json.IntOf("Status");
TC = json.BoolOf("TC");
RD = json.BoolOf("RD");
RA = json.BoolOf("RA");
AD = json.BoolOf("AD");
CD = json.BoolOf("CD");
i = 0;
count_i = json.SizeOfArray("Question");
while (i < count_i) {
    json.I = i;
    name = json.StringOf("Question[i].name");
    type = json.IntOf("Question[i].type");
    i = i + 1;
}

i = 0;
count_i = json.SizeOfArray("Answer");
// The domain name resolves to 1 or more IP addresses..
while (i < count_i) {
    json.I = i;
    name = json.StringOf("Answer[i].name");
    type = json.IntOf("Answer[i].type");
    TTL = json.IntOf("Answer[i].TTL");
    ipAddr = json.StringOf("Answer[i].data");

    Debug.WriteLine("IP Address: " + ipAddr);
    i = i + 1;
}