Go

Cloudfare DNS over HTTPS

See more Cloudfare Examples

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.

Go

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

    http := chilkat.NewHttp()

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

    http.SetAccept("application/dns-json")

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

    jsonResp := http.QuickGetStr(url)
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        return
    }

    fmt.Println("Response Status Code: ", http.LastStatus())

    json := chilkat.NewJsonObject()
    json.Load(*jsonResp)
    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

    if http.LastStatus() != 200 {
        fmt.Println("Failed.")
        http.DisposeHttp()
        json.DisposeJsonObject()
        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

    var Status int
    var TC bool
    var RD bool
    var RA bool
    var AD bool
    var CD bool
    var i int
    var count_i int
    var name *string = new(string)
    var type int
    var TTL int
    var data string
    var ipAddr *string = new(string)

    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")
    for i < count_i {
        json.SetI(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..
    for i < count_i {
        json.SetI(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")

        fmt.Println("IP Address: ", *ipAddr)
        i = i + 1
    }


    http.DisposeHttp()
    json.DisposeJsonObject()