old_contents: """ Send messages via an HTTP API (nostream) conversation. """
  
  import click
  
  from go_http.send import HttpApiSender
  
  
  @click.option(
      '--conversation', '-c',
      help='HTTP API conversation key')
  @click.option(
      '--token', '-t',
      help='HTTP API conversation token')
  @click.option(
      '--csv', type=click.File('rb'),
      help=('CSV file with columns to_addr, content and, optionally,'
            'session_event.'))
  @click.option(
      '--json', type=click.File('rb'),
      help=('JSON objects, one per line with fields to_addr, content and,'
            ' optionally, session_event'))
  @click.pass_context
  def send(ctx, conversation, token, csv, json):
      """ Send messages via an HTTP API (nostream) conversation.
      """
      http_api = HttpApiSender(ctx.obj.account_key, conversation, token)
      messages = []  # TODO: parse csv or json
      for msg in messages:
          http_api.send_text(**msg)
  
new_contents: """ Send messages via an HTTP API (nostream) conversation. """
  
  import csv
  import json
  
  import click
  
  from go_http.send import HttpApiSender
  
  
  @click.option(
      '--conversation', '-c',
      help='HTTP API conversation key')
  @click.option(
      '--token', '-t',
      help='HTTP API conversation token')
  @click.option(
      '--csv', type=click.File('rb'),
      help=('CSV file with columns to_addr, content and, optionally,'
            'session_event.'))
  @click.option(
      '--json', type=click.File('rb'),
      help=('JSON objects, one per line with fields to_addr, content and,'
            ' optionally, session_event'))
  @click.pass_context
  def send(ctx, conversation, token, csv, json):
      """ Send messages via an HTTP API (nostream) conversation.
      """
      if not any((csv, json)):
          click.echo("Please specify either --csv or --json.")
          ctx.abort()
      http_api = HttpApiSender(ctx.obj.account_key, conversation, token)
      if csv:
          for msg in messages_from_csv(csv):
              http_api.send_text(**msg)
      if json:
          for msg in messages_from_json(json):
              http_api.send_text(**msg)
  
  
  def messages_from_csv(csv_file):
      reader = csv.DictReader(csv_file)
      for data in reader:
          yield {
              "to_addr": data["to_addr"],
              "content": data["content"],
              "session_event": data.get("session_event")
          }
  
  
  def messages_from_json(json_file):
      for line in json_file:
          data = json.loads(line.rstrip("\n"))
          yield {
              "to_addr": data["to_addr"],
              "content": data["content"],
              "session_event": data.get("session_event")
          }
  
subject: Add CSV and JSON parsing.