Golang RequestCtx.UserAgent方法代码示例

func idHandlerFunc(ctx *fasthttp.RequestCtx, idWorker *goflake.IdWorker, retry int) {
	ua := string(ctx.UserAgent())

	var (
		id  uint64
		err error
	)

	for i := 0; i < retry; i++ {
		id, err = idWorker.GetId(ua)
		if err == nil {
			break
		}
	}

	r := map[string]string{
		"id": strconv.FormatUint(id, 10),
	}

	if strings.HasSuffix(string(ctx.Path()), ".msgpack") {
		ctx.SetContentType("application/x-msgpack; charset=UTF-8")
		if err := codec.NewEncoder(ctx, mh).Encode(r); err != nil {
			ctx.Error(err.Error(), fasthttp.StatusInternalServerError)
		}
	} else {
		ctx.SetContentType("application/json; charset=UTF-8")
		if err := json.NewEncoder(ctx).Encode(r); err != nil {
			ctx.Error(fmt.Sprintf(`{"error":"%v"}`, err.Error()), fasthttp.StatusInternalServerError)
		}
	}
}

func requestHandler(ctx *fasthttp.RequestCtx) {
	fmt.Fprintf(ctx, "Hello, world!\n\n")

	fmt.Fprintf(ctx, "Request method is %q\n", ctx.Method())
	fmt.Fprintf(ctx, "RequestURI is %q\n", ctx.RequestURI())
	fmt.Fprintf(ctx, "Requested path is %q\n", ctx.Path())
	fmt.Fprintf(ctx, "Host is %q\n", ctx.Host())
	fmt.Fprintf(ctx, "Query string is %q\n", ctx.QueryArgs())
	fmt.Fprintf(ctx, "User-Agent is %q\n", ctx.UserAgent())
	fmt.Fprintf(ctx, "Connection has been established at %s\n", ctx.ConnTime())
	fmt.Fprintf(ctx, "Request has been started at %s\n", ctx.Time())
	fmt.Fprintf(ctx, "Serial request number for the current connection is %d\n", ctx.ConnRequestNum())
	fmt.Fprintf(ctx, "Your ip is %q\n\n", ctx.RemoteIP())

	fmt.Fprintf(ctx, "Raw request is:\n---CUT---\n%s\n---CUT---", &ctx.Request)

	ctx.SetContentType("text/plain; charset=utf8")

	// Set arbitrary headers
	ctx.Response.Header.Set("X-My-Header", "my-header-value")

	// Set cookies
	var c fasthttp.Cookie
	c.SetKey("cookie-name")
	c.SetValue("cookie-value")
	ctx.Response.Header.SetCookie(&c)
}

func (rp *FastReverseProxy) handler(ctx *fasthttp.RequestCtx) {
	req := &ctx.Request
	resp := &ctx.Response
	host := string(req.Header.Host())
	uri := req.URI()
	if host == "__ping__" && len(uri.Path()) == 1 && uri.Path()[0] == byte('/') {
		resp.SetBody(okResponse)
		return
	}
	reqData, err := rp.Router.ChooseBackend(host)
	if err != nil {
		log.LogError(reqData.String(), string(uri.Path()), err)
	}
	dstScheme := ""
	dstHost := ""
	u, err := url.Parse(reqData.Backend)
	if err == nil {
		dstScheme = u.Scheme
		dstHost = u.Host
	} else {
		log.LogError(reqData.String(), string(uri.Path()), err)
	}
	if dstHost == "" {
		dstHost = reqData.Backend
	}
	upgrade := req.Header.Peek("Upgrade")
	if len(upgrade) > 0 && bytes.Compare(bytes.ToLower(upgrade), websocketUpgrade) == 0 {
		resp.SkipResponse = true
		rp.serveWebsocket(dstHost, reqData, ctx)
		return
	}
	var backendDuration time.Duration
	logEntry := func() *log.LogEntry {
		proto := "HTTP/1.0"
		if req.Header.IsHTTP11() {
			proto = "HTTP/1.1"
		}
		return &log.LogEntry{
			Now:             time.Now(),
			BackendDuration: backendDuration,
			TotalDuration:   time.Since(reqData.StartTime),
			BackendKey:      reqData.BackendKey,
			RemoteAddr:      ctx.RemoteAddr().String(),
			Method:          string(ctx.Method()),
			Path:            string(uri.Path()),
			Proto:           proto,
			Referer:         string(ctx.Referer()),
			UserAgent:       string(ctx.UserAgent()),
			RequestIDHeader: rp.RequestIDHeader,
			RequestID:       string(req.Header.Peek(rp.RequestIDHeader)),
			StatusCode:      resp.StatusCode(),
			ContentLength:   int64(resp.Header.ContentLength()),
		}
	}
	isDebug := len(req.Header.Peek("X-Debug-Router")) > 0
	req.Header.Del("X-Debug-Router")
	if dstHost == "" {
		resp.SetStatusCode(http.StatusBadRequest)
		resp.SetBody(noRouteResponseContent)
		rp.debugHeaders(resp, reqData, isDebug)
		endErr := rp.Router.EndRequest(reqData, false, logEntry)
		if endErr != nil {
			log.LogError(reqData.String(), string(uri.Path()), endErr)
		}
		return
	}
	if rp.RequestIDHeader != "" && len(req.Header.Peek(rp.RequestIDHeader)) == 0 {
		unparsedID, err := uuid.NewV4()
		if err == nil {
			req.Header.Set(rp.RequestIDHeader, unparsedID.String())
		} else {
			log.LogError(reqData.String(), string(uri.Path()), fmt.Errorf("unable to generate request id: %s", err))
		}
	}
	hostOnly, _, _ := net.SplitHostPort(dstHost)
	if hostOnly == "" {
		hostOnly = dstHost
	}
	isIP := net.ParseIP(hostOnly) != nil
	if !isIP {
		req.Header.SetBytesV("X-Host", uri.Host())
		req.Header.SetBytesV("X-Forwarded-Host", uri.Host())
		uri.SetHost(hostOnly)
	}
	client := rp.getClient(dstHost, dstScheme == "https")
	t0 := time.Now().UTC()
	err = client.Do(req, resp)
	backendDuration = time.Since(t0)
	markAsDead := false
	if err != nil {
		var isTimeout bool
		if netErr, ok := err.(net.Error); ok {
			markAsDead = !netErr.Temporary()
			isTimeout = netErr.Timeout()
		}
		if isTimeout {
			markAsDead = false
			err = fmt.Errorf("request timed out after %v: %s", time.Since(reqData.StartTime), err)
		} else {
			err = fmt.Errorf("error in backend request: %s", err)
//.........这里部分代码省略.........