.includeIPv6(false)
      .build()
  }

  private fun buildCryptoSx(bootstrapClient: OkHttpClient): DnsOverHttps {
    return DnsOverHttps.Builder()
      .client(bootstrapClient)
      .url("https://doh.crypto.sx/dns-query".toHttpUrl())
      .includeIPv6(false)
      .build()
  }

  @JvmStatic
  fun providers(
    client: OkHttpClient,
    http2Only: Boolean,
    workingOnly: Boolean,
    getOnly: Boolean,

su

// sv : http://www.svnet.org.sv/niveldos.pdf
sv
com.sv
edu.sv
gob.sv
org.sv
red.sv

// sx : https://en.wikipedia.org/wiki/.sx
// Submitted by registry <******@****.***>
sx
gov.sx

// sy : https://en.wikipedia.org/wiki/.sy
// see also: http://www.gobin.info/domainname/sy.doc
sy
edu.sy
gov.sy
net.sy
mil.sy
com.sy