Fix high memory usage in retry middleware

integration/fixtures/retry/simple.toml

@@ -0,0 +1,25 @@
+defaultEntryPoints = ["http"]
+
+logLevel = "DEBUG"
+
+[entryPoints]
+  [entryPoints.http]
+  address = ":8000"
+
+[api]
+
+[retry]
+
+[file]
+[backends]
+  [backends.backend1]
+    [backends.backend1.servers.server1]
+    url = "http://{{.WhoamiEndpoint}}:8080" # not valid
+    [backends.backend1.servers.server2]
+    url = "http://{{.WhoamiEndpoint}}:80"
+
+[frontends]
+  [frontends.frontend1]
+  backend = "backend1"
+    [frontends.frontend1.routes.test_1]
+    rule = "PathPrefix:/"

integration/integration_test.go

@@ -54,6 +54,7 @@ func init() {
 		check.Suite(&MarathonSuite{})
 		check.Suite(&MesosSuite{})
 		check.Suite(&RateLimitSuite{})
+		check.Suite(&RetrySuite{})
 		check.Suite(&SimpleSuite{})
 		check.Suite(&TimeoutSuite{})
 		check.Suite(&TracingSuite{})

integration/resources/compose/retry.yml

@@ -0,0 +1,2 @@
+whoami:
+  image: emilevauge/whoami

integration/retry_test.go

@@ -0,0 +1,40 @@
+package integration
+
+import (
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/containous/traefik/integration/try"
+	"github.com/go-check/check"
+	checker "github.com/vdemeester/shakers"
+)
+
+type RetrySuite struct{ BaseSuite }
+
+func (s *RetrySuite) SetUpSuite(c *check.C) {
+	s.createComposeProject(c, "retry")
+	s.composeProject.Start(c)
+}
+
+func (s *RetrySuite) TestRetry(c *check.C) {
+	whoamiEndpoint := s.composeProject.Container(c, "whoami").NetworkSettings.IPAddress
+	file := s.adaptFile(c, "fixtures/retry/simple.toml", struct {
+		WhoamiEndpoint string
+	}{whoamiEndpoint})
+	defer os.Remove(file)
+
+	cmd, display := s.traefikCmd(withConfigFile(file))
+	defer display(c)
+	err := cmd.Start()
+	c.Assert(err, checker.IsNil)
+	defer cmd.Process.Kill()
+
+	err = try.GetRequest("http://127.0.0.1:8080/api/providers", 60*time.Second, try.BodyContains("PathPrefix:/"))
+	c.Assert(err, checker.IsNil)
+
+	// This simulates a DialTimeout when connecting to the backend server.
+	response, err := http.Get("http://127.0.0.1:8000/")
+	c.Assert(err, checker.IsNil)
+	c.Assert(response.StatusCode, checker.Equals, http.StatusOK)
+}