curl --request GET \
  --url https://drb.coinbase.com/api/v2/public/get_order_book \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 8772,
  "jsonrpc": "2.0",
  "method": "public/get_order_book",
  "params": {
    "depth": 5,
    "instrument_name": "BTC-PERPETUAL"
  }
}
'

import requests

url = "https://drb.coinbase.com/api/v2/public/get_order_book"

payload = {
    "id": 8772,
    "jsonrpc": "2.0",
    "method": "public/get_order_book",
    "params": {
        "depth": 5,
        "instrument_name": "BTC-PERPETUAL"
    }
}
headers = {"Content-Type": "application/json"}

response = requests.get(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'GET',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 8772,
    jsonrpc: '2.0',
    method: 'public/get_order_book',
    params: {depth: 5, instrument_name: 'BTC-PERPETUAL'}
  })
};

fetch('https://drb.coinbase.com/api/v2/public/get_order_book', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://drb.coinbase.com/api/v2/public/get_order_book",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_POSTFIELDS => json_encode([
    'id' => 8772,
    'jsonrpc' => '2.0',
    'method' => 'public/get_order_book',
    'params' => [
        'depth' => 5,
        'instrument_name' => 'BTC-PERPETUAL'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://drb.coinbase.com/api/v2/public/get_order_book"

	payload := strings.NewReader("{\n  \"id\": 8772,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"public/get_order_book\",\n  \"params\": {\n    \"depth\": 5,\n    \"instrument_name\": \"BTC-PERPETUAL\"\n  }\n}")

	req, _ := http.NewRequest("GET", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://drb.coinbase.com/api/v2/public/get_order_book")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 8772,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"public/get_order_book\",\n  \"params\": {\n    \"depth\": 5,\n    \"instrument_name\": \"BTC-PERPETUAL\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://drb.coinbase.com/api/v2/public/get_order_book")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 8772,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"public/get_order_book\",\n  \"params\": {\n    \"depth\": 5,\n    \"instrument_name\": \"BTC-PERPETUAL\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "id": 8772,
  "jsonrpc": "2.0",
  "result": {
    "asks": [],
    "best_ask_amount": 0,
    "best_ask_price": 0,
    "best_bid_amount": 30,
    "best_bid_price": 3955.75,
    "bids": [
      [
        3955.75,
        30
      ],
      [
        3940.75,
        102020
      ],
      [
        3423,
        42840
      ]
    ],
    "change_id": 474988,
    "current_funding": 0.00500063,
    "funding_8h": 0.00455263,
    "index_price": 3910.46,
    "instrument_name": "BTC-PERPETUAL",
    "last_price": 3955.75,
    "mark_price": 3931.97,
    "max_price": 3971.74,
    "min_price": 3932.22,
    "open_interest": 45.27600333464605,
    "settlement_price": 3925.85,
    "state": "open",
    "stats": {
      "high": 3976.25,
      "low": 3940.75,
      "price_change": 0.6913,
      "volume": 93.35589552
    },
    "timestamp": 1550757626706
  }
}