diff --git a/appview/pulls/pull2.go b/appview/pulls/pull2.go
index bfc0a69e..589aa0be 100644
--- a/appview/pulls/pull2.go
+++ b/appview/pulls/pull2.go
@@ -14,6 +14,7 @@ import (
 	"tangled.org/core/api/tangled"
 	"tangled.org/core/appview/models"
 	"tangled.org/core/appview/pages"
+	gitmirrorv1 "tangled.org/core/gitmirror/proto/gen"
 	"tangled.org/core/types"
 )
 
@@ -21,7 +22,6 @@ import (
 // you will have to check if object exist in context "just in case"
 // so it's better to make helper function that can read the url pattern instead.
 
-
 // A -- B -- C
 // (master) (pr/123/0)
 //
@@ -200,16 +200,48 @@ func (s *Pulls) PullDiff(w http.ResponseWriter, r *http.Request) {
 
 // htmx fragment. render diff between commits
 func (s *Pulls) PullDiffFragment(w http.ResponseWriter, r *http.Request) {
-	// var (
-	// 	base    = r.URL.Query().Get("base") // base commit ID
-	// 	head    = r.URL.Query().Get("head") // head commit ID
-	// 	unified = r.URL.Query().Get("view") == "unified"
-	// )
+	var (
+		repoRaw = r.URL.Query().Get("repo")
+		base    = r.URL.Query().Get("base") // base commit ID
+		head    = r.URL.Query().Get("head") // head commit ID
+		unified = r.URL.Query().Get("view") == "unified"
+	)
+	repo, err := syntax.ParseDID(repoRaw)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("invalid repo DID: %q", repoRaw), http.StatusBadRequest)
+		return
+	}
 
-	// 1. get commit object
-	// 2. get diff between parent..commit (knotmirror), parse that diff
-	// 3. fetch each file entries (& run syntax highlight) <- skip this part for stage 1. we will do this at stage 2.
-	// 4. render diff
+	ctx := r.Context()
+
+	stream, err := s.gitmirror.Diff(ctx, &gitmirrorv1.DiffRequest{
+		Repo: repo.String(),
+		Base: base,
+		Head: head,
+	})
+	if err != nil {
+		panic("unimplemented")
+	}
+
+	diff, err := stream.Recv()
+	if err != nil {
+		panic("unimplemented")
+	}
+
+	_ = diff
+
+	// // 1. fetch each blob in parallel
+	// baseBlob, err := s.gitmirror.GetBlob(ctx, ...)
+	// headBlob, err := s.gitmirror.GetBlob(ctx, ...)
+
+	// 2. render diff by merging diff & blob content
+	if unified {
+		// render unified diff
+		// var lines []string
+	} else {
+		// render split diff
+		// var leftLines, rightLines []string
+	}
 }
 
 // htmx fragment. render interdiff between changes
diff --git a/appview/pulls/pulls.go b/appview/pulls/pulls.go
index 99764cdb..e9dac606 100644
--- a/appview/pulls/pulls.go
+++ b/appview/pulls/pulls.go
@@ -18,6 +18,7 @@ import (
 	"tangled.org/core/appview/oauth"
 	"tangled.org/core/appview/pages"
 	"tangled.org/core/appview/reporesolver"
+	knotmirror "tangled.org/core/gitmirror/proto/gen"
 	"tangled.org/core/idresolver"
 	"tangled.org/core/ogre"
 	"tangled.org/core/patchutil"
@@ -40,6 +41,7 @@ type Pulls struct {
 	logger           *slog.Logger
 	indexer          *pulls_indexer.Indexer
 	ogreClient       *ogre.Client
+	gitmirror       knotmirror.GitMirrorServiceClient
 }
 
 func New(