diff --git a/main.go b/main.go
index 638637e..d382901 100644
--- a/main.go
+++ b/main.go
@@ -640,22 +640,10 @@ func createLLM() (llms.Model, error) {
 			return nil, fmt.Errorf("OpenAI API key is not set")
 		}
 
-		// Create custom transport that adds headers
-		customTransport := &headerTransport{
-			transport: http.DefaultTransport,
-			headers: map[string]string{
-				"X-Title": "paperless-gpt",
-			},
-		}
-
-		// Create custom client with the transport
-		httpClient := http.DefaultClient
-		httpClient.Transport = customTransport
-
 		return openai.New(
 			openai.WithModel(llmModel),
 			openai.WithToken(openaiAPIKey),
-			openai.WithHTTPClient(httpClient),
+			openai.WithHTTPClient(createCustomHTTPClient()),
 		)
 	case "ollama":
 		host := os.Getenv("OLLAMA_HOST")
@@ -678,22 +666,10 @@ func createVisionLLM() (llms.Model, error) {
 			return nil, fmt.Errorf("OpenAI API key is not set")
 		}
 
-		// Create custom transport that adds headers
-		customTransport := &headerTransport{
-			transport: http.DefaultTransport,
-			headers: map[string]string{
-				"X-Title": "paperless-gpt",
-			},
-		}
-
-		// Create custom client with the transport
-		httpClient := http.DefaultClient
-		httpClient.Transport = customTransport
-
 		return openai.New(
 			openai.WithModel(visionLlmModel),
 			openai.WithToken(openaiAPIKey),
-			openai.WithHTTPClient(httpClient),
+			openai.WithHTTPClient(createCustomHTTPClient()),
 		)
 	case "ollama":
 		host := os.Getenv("OLLAMA_HOST")
@@ -710,6 +686,22 @@ func createVisionLLM() (llms.Model, error) {
 	}
 }
 
+func createCustomHTTPClient() *http.Client {
+	// Create custom transport that adds headers
+	customTransport := &headerTransport{
+		transport: http.DefaultTransport,
+		headers: map[string]string{
+			"X-Title": "paperless-gpt",
+		},
+	}
+
+	// Create custom client with the transport
+	httpClient := http.DefaultClient
+	httpClient.Transport = customTransport
+
+	return httpClient
+}
+
 // headerTransport is a custom http.RoundTripper that adds custom headers to requests
 type headerTransport struct {
 	transport http.RoundTripper
diff --git a/main_test.go b/main_test.go
index b3fd0ad..cf4e3d1 100644
--- a/main_test.go
+++ b/main_test.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"net/http/httptest"
 	"slices"
 	"testing"
 	"text/template"
@@ -175,3 +176,24 @@ func TestProcessAutoTagDocuments(t *testing.T) {
 		})
 	}
 }
+
+func TestCreateCustomHTTPClient(t *testing.T) {
+	// Create a test server
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Verify custom header
+		assert.Equal(t, "paperless-gpt", r.Header.Get("X-Title"), "Expected X-Title header")
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer server.Close()
+
+	// Get custom client
+	client := createCustomHTTPClient()
+	require.NotNil(t, client, "HTTP client should not be nil")
+
+	// Make a request
+	resp, err := client.Get(server.URL)
+	require.NoError(t, err, "Request should not fail")
+	defer resp.Body.Close()
+
+	assert.Equal(t, http.StatusOK, resp.StatusCode, "Expected 200 OK response")
+}