write(buffer) {
	    if (this.error) {
	      return null;
	    }
	    if (!this._parser) {
	      this._error(
	        new FormidableError('uninitialized parser', errors.uninitializedParser),
	      );
	      return null;
	    }

	    this.bytesReceived += buffer.length;
	    this.emit('progress', this.bytesReceived, this.bytesExpected);

	    this._parser.write(buffer);

	    return this.bytesReceived;
	  }
Maximum size of buffered response body, in bytes. Counts uncompressed size.
Default 200MB.

@param {Number} n number of bytes
@return {Request} for chaining