function convertRawHeadersToHeaders(rawHeaders) {
    var headers = {};
    if(!rawHeaders) {
      return undefined;
    }

    for(var i = 0; i < rawHeaders.length; i++) {
      var headerName;
      if (rawHeaders[i].indexOf(HeaderConstants.PREFIX_FOR_STORAGE_METADATA) === 0) {
        headerName = rawHeaders[i];
      } else {
        headerName = rawHeaders[i].toLowerCase();
      }
      headers[headerName] = rawHeaders[++i];
    }

    return headers;
  }
Process the response.
@ignore

@param {WebResource} webResource                The web resource that made the request.
@param {Response}    response                   The response object.
@param {Options}     options                    The response parsing options.
@param {String}      options.payloadFormat      The payload format.
@return The normalized responseObject.