diff --git a/handlers_test.go b/handlers_test.go
new file mode 100644
index 0000000..ed2013d
--- /dev/null
+++ b/handlers_test.go
@@ -0,0 +1,112 @@
+package rushlink
+
+import (
+	"bytes"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
+	"github.com/gorilla/mux"
+)
+
+// createTemporaryRouter initializes a rushlink instance, with temporary
+// filestore and database.
+//
+// It will use testing.T.Cleanup to cleanup after itself.
+func createTemporaryRouter(t *testing.T) *mux.Router {
+	tempDir, err := ioutil.TempDir("", "rushlink-tmp-*")
+	if err != nil {
+		t.Fatalf("creating temporary directory: %s\n", err)
+	}
+	t.Cleanup(func() {
+		os.RemoveAll(tempDir)
+	})
+
+	fileStore, err := db.OpenFileStore(filepath.Join(tempDir, "filestore"))
+	if err != nil {
+		t.Fatalf("opening temporary filestore: %s\n", err)
+	}
+	databasePath := filepath.Join(tempDir, "rushlink.db")
+	database, err := db.OpenDB(databasePath, fileStore)
+	if err != nil {
+		t.Fatalf("opening temporary database: %s\n", err)
+	}
+	t.Cleanup(func() {
+		if err := database.Close(); err != nil {
+			t.Errorf("closing database: %d\n", err)
+		}
+	})
+
+	// *.invalid. is guaranteed not to exist (RFC 6761).
+	rootURL, err := url.Parse("https://rushlink.invalid")
+	if err != nil {
+		t.Fatalf("parsing URL: %s\n", err)
+	}
+
+	rl := rushlink{
+		db:      database,
+		fs:      fileStore,
+		rootURL: rootURL,
+	}
+	return CreateMainRouter(&rl)
+}
+
+// checkStatusCode checks whether the status code from a recorded response is equal
+// to some response code.
+func checkStatusCode(t *testing.T, rr *httptest.ResponseRecorder, code int) {
+	if actual := rr.Code; actual != code {
+		t.Logf("request body:\n%v\n", rr.Body.String())
+		t.Fatalf("handler returned wrong status code: got %v want %v\n",
+			actual, code)
+	}
+}
+
+// checkLocationHeader checks whether the status code from a recorded response is equal
+// to some expected URL.
+func checkLocationHeader(t *testing.T, rr *httptest.ResponseRecorder, expected string) {
+	location := rr.Header().Get("Location")
+	if location != expected {
+		t.Fatalf("handler returned bad redirect location: got %v want %v", location, expected)
+	}
+}
+
+func TestIssue43(t *testing.T) {
+	srv := createTemporaryRouter(t)
+
+	// Put a URL with a fragment identifier into the database.
+	var body bytes.Buffer
+	form := multipart.NewWriter(&body)
+	form.WriteField("shorten", "https://example.com#fragment")
+	form.Close()
+	req, err := http.NewRequest("POST", "/", bytes.NewReader(body.Bytes()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Add("Content-Type", form.FormDataContentType())
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusOK)
+	rawURL := strings.SplitN(rr.Body.String(), "\n", 2)[0]
+	pasteURL, err := url.Parse(rawURL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Check if the URL was encoded correctly.
+	req, err = http.NewRequest("GET", pasteURL.Path, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req = mux.SetURLVars(req, map[string]string{"key": pasteURL.Path[1:]})
+	rr = httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusTemporaryRedirect)
+	checkLocationHeader(t, rr, "https://example.com#fragment")
+}
diff --git a/router.go b/router.go
index 64cdfd1..9def677 100644
--- a/router.go
+++ b/router.go
@@ -79,23 +79,8 @@ func (w *statusResponseWriter) WriteHeader(statusCode int) {
 	w.Inner.WriteHeader(statusCode)
 }
 
-// StartMainServer starts the main http server listening on addr.
-func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawRootURL string) {
-	var rootURL *url.URL
-	if rawRootURL != "" {
-		var err error
-		rootURL, err = url.Parse(rawRootURL)
-		if err != nil {
-			log.Fatalln(errors.Wrap(err, "could not parse rootURL flag"))
-		}
-	}
-	rl := rushlink{
-		db:      db,
-		fs:      fs,
-		rootURL: rootURL,
-	}
-
-	// Initialize Gorilla router
+// CreateMainRouter creates the main Gorilla router for the application.
+func CreateMainRouter(rl *rushlink) *mux.Router {
 	router := mux.NewRouter()
 	router.Use(rl.recoveryMiddleware)
 	router.Use(rl.metricsMiddleware)
@@ -114,9 +99,27 @@ func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawRootURL
 	router.HandleFunc("/"+urlKeyWithExtExpr, rl.deletePasteHandler).Methods("DELETE")
 	router.HandleFunc("/"+urlKeyExpr+"/delete", rl.deletePasteHandler).Methods("POST")
 	router.HandleFunc("/"+urlKeyWithExtExpr+"/delete", rl.deletePasteHandler).Methods("POST")
+	return router
+}
+
+// StartMainServer starts the main http server listening on addr.
+func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawRootURL string) {
+	var rootURL *url.URL
+	if rawRootURL != "" {
+		var err error
+		rootURL, err = url.Parse(rawRootURL)
+		if err != nil {
+			log.Fatalln(errors.Wrap(err, "could not parse rootURL flag"))
+		}
+	}
+	rl := rushlink{
+		db:      db,
+		fs:      fs,
+		rootURL: rootURL,
+	}
 
 	srv := &http.Server{
-		Handler:      router,
+		Handler:      CreateMainRouter(&rl),
 		Addr:         addr,
 		WriteTimeout: 15 * time.Second,
 		ReadTimeout:  15 * time.Second,