 as a string, c) return the object as the response body of the mruby handler.
</p>
<p>
The header and the body object passed to <code>http_request</code> should conform to the requirements laid out by the Rack specification for request header and request body.
The response header and the response body object returned by the <code>#join</code> method of the promise returned by <code>http_request</code> conforms to the requirements of the Rack specification.
</p>
<p>
Since the API provides an asynchronous HTT