_body_parser_stream_init() {
        // Set the body parser mode to stream mode
        this._body_parser_mode = 2;

        // Overwrite the underlying readable _read handler to resume the request when more chunks are requested
        // This will properly handle backpressure and prevent the request from being paused forever
        this._readable._read = () => this.resume();

        // Flush the buffered chunks to the readable stream if we have any
        this._body_parser_flush_buffered();
    }
This method is called when the underlying Readable stream is initialized and begins expecting incoming data.
@private