Configure client against DOS

modules/activitypub/client.go

@@ -85,8 +85,10 @@ func NewClient(ctx context.Context, user *user_model.User, pubID string) (c *Cli
 	c = &Client{
 		client: &http.Client{
 			Transport: &http.Transport{
-				Proxy: proxy.Proxy(),
+				Proxy:           proxy.Proxy(),
+				MaxConnsPerHost: 20,
 			},
+			Timeout: time.Duration(5 * time.Second),
 		},
 		algs:        setting.HttpsigAlgs,
 		digestAlg:   httpsig.DigestAlgorithm(setting.Federation.DigestAlgorithm),

routers/api/v1/activitypub/repository.go

@@ -10,7 +10,6 @@ import (
 	"fmt"
 	"net/http"
 	"strings"
-	"time"
 
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/forgefed"
@@ -160,9 +159,6 @@ func RepositoryInbox(ctx *context.APIContext) {
 		}
 	}
 
-	// wait 5 sec.
-	time.Sleep(5 * time.Second)
-
 	ctx.Status(http.StatusNoContent)
 }