diff --git a/internal/source/gitlab/api/lookup.go b/internal/source/gitlab/api/lookup.go
index 73a3ce433a65e3930ac6061973412aa832feb9e4..28208d5a3b9b6457b942f941bb0cbdb2e9d80ff2 100644
--- a/internal/source/gitlab/api/lookup.go
+++ b/internal/source/gitlab/api/lookup.go
@@ -2,6 +2,7 @@ package api
 
 // Lookup defines an API lookup action with a response that GitLab sends
 type Lookup struct {
+	ETag   string
 	Name   string
 	Error  error
 	Domain *VirtualDomain
diff --git a/internal/source/gitlab/client/client.go b/internal/source/gitlab/client/client.go
index afe9da6f8a06205378bc6d629bc322d13adaa009..97be3e7468607fba9767182187c2130529f2e7c7 100644
--- a/internal/source/gitlab/client/client.go
+++ b/internal/source/gitlab/client/client.go
@@ -2,6 +2,8 @@ package client
 
 import (
 	"context"
+	"crypto/md5"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -88,6 +90,12 @@ func (gc *Client) GetLookup(ctx context.Context, host string) api.Lookup {
 	lookup := api.Lookup{Name: host}
 	lookup.Error = json.NewDecoder(resp.Body).Decode(&lookup.Domain)
 
+	sum := md5.New()
+	io.Copy(sum, resp.Body)
+	io.WriteString(sum, host)
+	hash := sum.Sum(nil)
+	lookup.ETag = hex.EncodeToString(hash[:])
+
 	return lookup
 }
 
diff --git a/internal/source/gitlab/client/client_stub.go b/internal/source/gitlab/client/client_stub.go
index 604f127bdab135714e4ea83f4ed3699a1b43751d..38dc1518c4397ffe1f4dcb99bfc6431f1cab2fcb 100644
--- a/internal/source/gitlab/client/client_stub.go
+++ b/internal/source/gitlab/client/client_stub.go
@@ -31,6 +31,7 @@ func (c StubClient) GetLookup(ctx context.Context, host string) api.Lookup {
 	}
 	defer f.Close()
 
+	lookup.ETag = "simple-etag"
 	lookup.Error = json.NewDecoder(f).Decode(&lookup.Domain)
 
 	return lookup
diff --git a/internal/source/gitlab/gitlab.go b/internal/source/gitlab/gitlab.go
index cce707339592c0797d2076b2d5a88c22fab7b878..f9cf297ebe50c7343c3649cf23eb10739598529b 100644
--- a/internal/source/gitlab/gitlab.go
+++ b/internal/source/gitlab/gitlab.go
@@ -6,6 +6,9 @@ import (
 	"net/http"
 	"path"
 	"strings"
+	"time"
+
+	store "github.com/patrickmn/go-cache"
 
 	"gitlab.com/gitlab-org/gitlab-pages/internal/domain"
 	"gitlab.com/gitlab-org/gitlab-pages/internal/request"
@@ -19,6 +22,7 @@ import (
 // information about domains from GitLab instance.
 type Gitlab struct {
 	client api.Resolver
+	store  *store.Cache
 }
 
 // New returns a new instance of gitlab domain source.
@@ -28,7 +32,16 @@ func New(config client.Config) (*Gitlab, error) {
 		return nil, err
 	}
 
-	return &Gitlab{client: cache.NewCache(client)}, nil
+	return NewFromClient(client), nil
+}
+
+// NewFromClient fabricates a new Gitlab domains source using api.Client passed
+// in an argument
+func NewFromClient(client api.Client) *Gitlab {
+	return &Gitlab{
+		client: cache.NewCache(client),
+		store:  store.New(time.Hour, time.Minute),
+	}
 }
 
 // GetDomain return a representation of a domain that we have fetched from
@@ -45,6 +58,15 @@ func (g *Gitlab) GetDomain(name string) (*domain.Domain, error) {
 		return nil, nil
 	}
 
+	if len(lookup.ETag) == 0 {
+		return nil, errors.New("lookup does not contain etag")
+	}
+
+	entry, ok := g.store.Get(lookup.ETag)
+	if ok {
+		return entry.(*domain.Domain), nil
+	}
+
 	domain := domain.Domain{
 		Name:            name,
 		CertificateCert: lookup.Domain.Certificate,
@@ -52,6 +74,8 @@ func (g *Gitlab) GetDomain(name string) (*domain.Domain, error) {
 		Resolver:        g,
 	}
 
+	g.store.SetDefault(lookup.ETag, &domain)
+
 	return &domain, nil
 }
 
diff --git a/internal/source/gitlab/gitlab_test.go b/internal/source/gitlab/gitlab_test.go
index 0e855f10b2723ecc7962ee4ad80c3d3ce0a6b23b..ab852e50b9546962a3603ca5655e77bc05c3dd3c 100644
--- a/internal/source/gitlab/gitlab_test.go
+++ b/internal/source/gitlab/gitlab_test.go
@@ -10,9 +10,9 @@ import (
 )
 
 func TestGetDomain(t *testing.T) {
-	t.Run("when the response if correct", func(t *testing.T) {
+	t.Run("when the response is correct", func(t *testing.T) {
 		client := client.StubClient{File: "client/testdata/test.gitlab.io.json"}
-		source := Gitlab{client: client}
+		source := NewFromClient(client)
 
 		domain, err := source.GetDomain("test.gitlab.io")
 		require.NoError(t, err)
@@ -22,7 +22,7 @@ func TestGetDomain(t *testing.T) {
 
 	t.Run("when the response is not valid", func(t *testing.T) {
 		client := client.StubClient{File: "/dev/null"}
-		source := Gitlab{client: client}
+		source := NewFromClient(client)
 
 		domain, err := source.GetDomain("test.gitlab.io")
 
@@ -33,7 +33,7 @@ func TestGetDomain(t *testing.T) {
 
 func TestResolve(t *testing.T) {
 	client := client.StubClient{File: "client/testdata/test.gitlab.io.json"}
-	source := Gitlab{client: client}
+	source := NewFromClient(client)
 
 	t.Run("when requesting nested group project with root path", func(t *testing.T) {
 		target := "https://test.gitlab.io:443/my/pages/project/"