Returns the response body as an InputStream.

  Returns the response body as an InputStream.
Returns: an InputStream from which the response body can be accessed
Throws:
- IOException - if an I/O error occurs while getting the response body

  Returns the response headers as a Map.

  Returns the response headers as a Map.
Returns: An immutable Map from response header field names to lists of field values. The status line has null as its field name.
Throws:
- IOException - if an I/O error occurs while getting the response headers