http.ErrUseLastResponse setting is invalid

[kamly]

HI, I set http.ErrUseLastResponse in SetRedirectPolicy. Expected to disable redirects, but this setting is invalid

client.SetRedirectPolicy(resty.RedirectPolicyFunc(func(req *http.Request, via []*http.Request) error {
		return http.ErrUseLastResponse
	}))

Demo:

package main

import (
	"fmt"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/go-resty/resty/v2"
)

// ProxyRequest
type ProxyRequest struct {
	URL     string            `json:"url" binding:"required"`
	Body    string            `json:"body"`
	Headers map[string]string `json:"headers"`
}

func proxyHandler(c *gin.Context) {
	var proxyReq ProxyRequest
	proxyReq.URL = "https://httpbin.org/anything"
	proxyReq.Body = `{"name":"test"}`
	proxyReq.Headers = map[string]string{
		"Content-Type": "application/json",
	}

	// Create a new Resty client
	client := resty.New()
	// Disable Redirect
	client.SetRedirectPolicy(resty.RedirectPolicyFunc(func(req *http.Request, via []*http.Request) error {
		fmt.Println("================")
		fmt.Println(http.ErrUseLastResponse)
		fmt.Println("================")
		return http.ErrUseLastResponse
	}))

	// Send the request
	resp, err := client.R().
		SetBody(proxyReq.Body).
		Execute(c.Request.Method, proxyReq.URL)

	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
}

func main() {
	r := gin.Default()
	r.POST("/proxy", proxyHandler)
	r.Run(":8080")
}

Test:

func TestProxyHandler_Redirect(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Location", "https://example.com")
		w.WriteHeader(http.StatusTemporaryRedirect)
	}))
	defer ts.Close()

	proxyReq := ProxyRequest{
		URL: ts.URL,
	}
	reqBody, _ := json.Marshal(proxyReq)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/proxy", bytes.NewReader(reqBody))
	req.Header.Set("Content-Type", "application/json")

	router := setupRouter()
	router.ServeHTTP(w, req)

	fmt.Println(w.Code)
	fmt.Println(w.Body.String())
}