func (resp *Response) ResetBody() {
	resp.closeBodyStream()
	if resp.body != nil {
		if resp.keepBodyBuffer {
			resp.body.Reset()
		} else {
			responseBodyPool.Put(resp.body)
			resp.body = nil
		}
	}
}
ResetBody resets response body.
package fasthttp
import (
	"bufio"
	"bytes"
	"errors"
	"fmt"
	"io"
	"mime/multipart"
	"os"
	"sync"
	"github.com/valyala/bytebufferpool"
)
type Request struct {
	noCopy noCopy
	Header RequestHeader
	uri      URI
	postArgs Args
	bodyStream io.Reader
	w          requestBodyWriter
	body       *bytebufferpool.ByteBuffer
	multipartForm         *multipart.Form
	multipartFormBoundary string
	parsedURI      bool
	parsedPostArgs bool
	keepBodyBuffer bool
	isTLS bool
}
type Response struct {
	noCopy noCopy
	Header ResponseHeader
	bodyStream io.Reader
	w          responseBodyWriter
	body       *bytebufferpool.ByteBuffer
	SkipBody bool
	keepBodyBuffer bool
}
func (req *Request) SetHost(host string) {
	req.URI().SetHost(host)
}
func (req *Request) SetHostBytes(host []byte) {
	req.URI().SetHostBytes(host)
}
func (req *Request) Host() []byte {
	return req.URI().Host()
}
func (req *Request) SetRequestURI(requestURI string) {
	req.Header.SetRequestURI(requestURI)
	req.parsedURI = false
}
func (req *Request) SetRequestURIBytes(requestURI []byte) {
	req.Header.SetRequestURIBytes(requestURI)
	req.parsedURI = false
}
func (req *Request) RequestURI() []byte {
	if req.parsedURI {
		requestURI := req.uri.RequestURI()
		req.SetRequestURIBytes(requestURI)
	}
	return req.Header.RequestURI()
}
func (resp *Response) StatusCode() int {
	return resp.Header.StatusCode()
}
func (resp *Response) SetStatusCode(statusCode int) {
	resp.Header.SetStatusCode(statusCode)
}
func (resp *Response) ConnectionClose() bool {
	return resp.Header.ConnectionClose()
}
func (resp *Response) SetConnectionClose() {
	resp.Header.SetConnectionClose()
}
func (req *Request) ConnectionClose() bool {
	return req.Header.ConnectionClose()
}
func (req *Request) SetConnectionClose() {
	req.Header.SetConnectionClose()
}
func (resp *Response) SendFile(path string) error {
	f, err := os.Open(path)
	if err != nil {
		return err
	}
	fileInfo, err := f.Stat()
	if err != nil {
		f.Close()
		return err
	}
	size64 := fileInfo.Size()
	size := int(size64)
	if int64(size) != size64 {
		size = -1
	}
	resp.Header.SetLastModified(fileInfo.ModTime())
	resp.SetBodyStream(f, size)
	return nil
}
func (req *Request) SetBodyStream(bodyStream io.Reader, bodySize int) {
	req.ResetBody()
	req.bodyStream = bodyStream
	req.Header.SetContentLength(bodySize)
}
func (resp *Response) SetBodyStream(bodyStream io.Reader, bodySize int) {
	resp.ResetBody()
	resp.bodyStream = bodyStream
	resp.Header.SetContentLength(bodySize)
}
func (req *Request) IsBodyStream() bool {
	return req.bodyStream != nil
}
func (resp *Response) IsBodyStream() bool {
	return resp.bodyStream != nil
}
func (req *Request) SetBodyStreamWriter(sw StreamWriter) {
	sr := NewStreamReader(sw)
	req.SetBodyStream(sr, -1)
}
func (resp *Response) SetBodyStreamWriter(sw StreamWriter) {
	sr := NewStreamReader(sw)
	resp.SetBodyStream(sr, -1)
}
func (resp *Response) BodyWriter() io.Writer {
	resp.w.r = resp
	return &resp.w
}
func (req *Request) BodyWriter() io.Writer {
	req.w.r = req
	return &req.w
}
type responseBodyWriter struct {
	r *Response
}
func (w *responseBodyWriter) Write(p []byte) (int, error) {
	w.r.AppendBody(p)
	return len(p), nil
}
type requestBodyWriter struct {
	r *Request
}
func (w *requestBodyWriter) Write(p []byte) (int, error) {
	w.r.AppendBody(p)
	return len(p), nil
}
func (resp *Response) Body() []byte {
	if resp.bodyStream != nil {
		bodyBuf := resp.bodyBuffer()
		bodyBuf.Reset()
		_, err := copyZeroAlloc(bodyBuf, resp.bodyStream)
		resp.closeBodyStream()
		if err != nil {
			bodyBuf.SetString(err.Error())
		}
	}
	return resp.bodyBytes()
}
func (resp *Response) bodyBytes() []byte {
	if resp.body == nil {
		return nil
	}
	return resp.body.B
}
func (req *Request) bodyBytes() []byte {
	if req.body == nil {
		return nil
	}
	return req.body.B
}
func (resp *Response) bodyBuffer() *bytebufferpool.ByteBuffer {
	if resp.body == nil {
		resp.body = responseBodyPool.Get()
	}
	return resp.body
}
func (req *Request) bodyBuffer() *bytebufferpool.ByteBuffer {
	if req.body == nil {
		req.body = requestBodyPool.Get()
	}
	return req.body
}
var (
	responseBodyPool bytebufferpool.Pool
	requestBodyPool  bytebufferpool.Pool
)
func (req *Request) BodyGunzip() ([]byte, error) {
	return gunzipData(req.Body())
}
func (resp *Response) BodyGunzip() ([]byte, error) {
	return gunzipData(resp.Body())
}
func gunzipData(p []byte) ([]byte, error) {
	var bb ByteBuffer
	_, err := WriteGunzip(&bb, p)
	if err != nil {
		return nil, err
	}
	return bb.B, nil
}
func (req *Request) BodyInflate() ([]byte, error) {
	return inflateData(req.Body())
}
func (resp *Response) BodyInflate() ([]byte, error) {
	return inflateData(resp.Body())
}
func inflateData(p []byte) ([]byte, error) {
	var bb ByteBuffer
	_, err := WriteInflate(&bb, p)
	if err != nil {
		return nil, err
	}
	return bb.B, nil
}
func (req *Request) BodyWriteTo(w io.Writer) error {
	if req.bodyStream != nil {
		_, err := copyZeroAlloc(w, req.bodyStream)
		req.closeBodyStream()
		return err
	}
	if req.onlyMultipartForm() {
		return WriteMultipartForm(w, req.multipartForm, req.multipartFormBoundary)
	}
	_, err := w.Write(req.bodyBytes())
	return err
}
func (resp *Response) BodyWriteTo(w io.Writer) error {
	if resp.bodyStream != nil {
		_, err := copyZeroAlloc(w, resp.bodyStream)
		resp.closeBodyStream()
		return err
	}
	_, err := w.Write(resp.bodyBytes())
	return err
}
func (resp *Response) AppendBody(p []byte) {
	resp.AppendBodyString(b2s(p))
}
func (resp *Response) AppendBodyString(s string) {
	resp.closeBodyStream()
	resp.bodyBuffer().WriteString(s)
}
func (resp *Response) SetBody(body []byte) {
	resp.SetBodyString(b2s(body))
}
func (resp *Response) SetBodyString(body string) {
	resp.closeBodyStream()
	bodyBuf := resp.bodyBuffer()
	bodyBuf.Reset()
	bodyBuf.WriteString(body)
}