fix the concurrent race of reuse of fasthttp resp body

Signed-off-by: allen.wq <allen.wq@alipay.com>

pkg/httputils/http_util.go

@@ -165,7 +165,9 @@ func do(url string, headers map[string]string, timeout time.Duration, rsf reques
 	}
 
 	statusCode = resp.StatusCode()
-	body = resp.Body()
+	data := resp.Body()
+	body = make([]byte, len(data))
+	copy(body, data)
 	return
 }
 

pkg/httputils/http_util_test.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"math/rand"
 	"net"
+	"sync"
 	"testing"
 	"time"
 
@@ -215,6 +216,22 @@ func (s *HTTPUtilTestSuite) TestGetRangeSE(c *check.C) {
 	}
 }
 
+func (s *HTTPUtilTestSuite) TestConcurrencyPostJson(c *check.C) {
+	wg := &sync.WaitGroup{}
+	wg.Add(100)
+
+	for i := 0; i < 100; i++ {
+		go func(x, y int) {
+			defer wg.Done()
+			code, body, e := PostJSON("http://"+s.host, req(x, y), 1*time.Second)
+			time.Sleep(20 * time.Millisecond)
+			checkOk(c, code, body, e, x+y)
+		}(i, i)
+	}
+
+	wg.Wait()
+}
+
 // ----------------------------------------------------------------------------
 // helper functions and structures