Modern Full-Stack Development

 Getting the Body of a Message
Remember that the server, when sending a list of messages, does not send the message 
bodies. We only get the body of a selected message when needed, and that’s where 
getMessageBody() factors in:
public async getMessageBody(inID: string, inMailbox: String):
  Promise {
  const response: AxiosResponse = await axios.get(
    `${config.serverAddress}/messages/${inMailbox}/${inID}`
  );
  return response.data;
}
We need the ID of the message and the path to the mailbox it’s in, but other than 
that, it’s not substantially different from getting a list of mailboxes.