code: def cmd_http_headers(server, verbose):
      
      if verbose:
          logging.basicConfig(level=logging.INFO, format='%(message)s')
  
      if verbose:
          print("[-] Retrieving the HTTP headers of the server...")
  
      headers = get_headers(server)
  
      if headers is not False:
          print(json.dumps(headers, indent=4))
      else:
          print("[X] URL {} is not valid!", file=sys.stderr)
  
      if verbose:
          print("[+] HTTP headers from {} retrieved".format(server))
  
      return True
docs: Retrieve the HTTP headers of a web server.
  
      Example:
  
      \b
      $ habu.http.headers http://duckduckgo.com
      {
          "Server": "nginx",
          "Date": "Sun, 14 Apr 2019 00:00:55 GMT",
          "Content-Type": "text/html",
          "Content-Length": "178",
          "Connection": "keep-alive",
          "Location": "https://duckduckgo.com/",
          "X-Frame-Options": "SAMEORIGIN",
          "Content-Security-Policy": "default-src https: blob: data: 'unsafe-inline' 'unsafe-eval'",
          "X-XSS-Protection": "1;mode=block",
          "X-Content-Type-Options": "nosniff",
          "Referrer-Policy": "origin",
          "Expect-CT": "max-age=0",
          "Expires": "Mon, 13 Apr 2020 00:00:55 GMT",
          "Cache-Control": "max-age=31536000"
      }