GET List available Slack channels

curl --proto "=https" --tlsv1.2 --silent --show-error --max-time 10 --output /dev/null --write-out "%{http_code}\n" \
  --request GET \
  --header @"$HOME/.config/metribeacon/headers.txt" \
  "https://metribeacon.com/api/v1/notifications/slack/installations/{installation}/channels"

import json
from pathlib import Path
from urllib.request import Request, HTTPRedirectHandler, build_opener
from urllib.error import HTTPError

config = Path.home() / ".config/metribeacon"
headers = json.loads((config / "headers.json").read_text())
body = None
request = Request("https://metribeacon.com/api/v1/notifications/slack/installations/{installation}/channels", data=body, headers=headers, method="GET")
class NoRedirect(HTTPRedirectHandler):
    def redirect_request(self, request, fp, code, message, headers, target):
        return None

try:
    with build_opener(NoRedirect()).open(request, timeout=10) as response:
        print(response.status)
except HTTPError as error:
    print(error.code)
    error.close()

import { readFile } from "node:fs/promises";
import { homedir } from "node:os";
import { join } from "node:path";

const config = join(homedir(), ".config/metribeacon");
const headers = JSON.parse(await readFile(join(config, "headers.json"), "utf8"));
const response = await fetch("https://metribeacon.com/api/v1/notifications/slack/installations/{installation}/channels", {
  method: "GET", headers, redirect: "manual",
  signal: AbortSignal.timeout(10000),
});
console.log(response.status);
await response.body?.cancel();

package main

import (
 "encoding/json"
 "fmt"
 "net/http"
 "os"
 "path/filepath"
 "time"
)

func main() {
 home, err := os.UserHomeDir(); if err != nil { panic("local configuration unavailable") }
 config := filepath.Join(home, ".config/metribeacon")
 raw, err := os.ReadFile(filepath.Join(config,"headers.json")); if err != nil { panic("local headers unavailable") }
 var headers map[string]string
 if json.Unmarshal(raw,&headers) != nil { panic("invalid local headers") }
 request, err := http.NewRequest("GET","https://metribeacon.com/api/v1/notifications/slack/installations/{installation}/channels",nil)
 if err != nil { panic("request unavailable") }
 for key,value := range headers { request.Header.Set(key,value) }
 client := &http.Client{Timeout:10*time.Second,CheckRedirect:func(*http.Request,[]*http.Request)error{return http.ErrUseLastResponse}}
 response, err := client.Do(request); if err != nil { panic("request failed; credentials and response omitted") }
 defer response.Body.Close()
 fmt.Println(response.StatusCode)
}