diff --git a/internal/server/web_test.go b/internal/server/web_test.go
index 476367e262de..c285d9f00044 100644
--- a/internal/server/web_test.go
+++ b/internal/server/web_test.go
@@ -4,82 +4,162 @@ import (
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"strings"
 	"testing"
 
+	"github.com/go-chi/chi/v5"
 	"github.com/go-goquery/goquery"
 )
 
+// TestWebEndpoint tests the routes defined in webRouter mounted under /ui.
 func TestWebEndpoint(t *testing.T) {
-	router, err := webRouter()
+	mainRouter := chi.NewRouter()
+	webR, err := webRouter()
 	if err != nil {
 		t.Fatalf("Failed to create webRouter: %v", err)
 	}
+	mainRouter.Mount("/ui", webR)
 
-	ts := httptest.NewServer(router)
+	ts := httptest.NewServer(mainRouter)
 	defer ts.Close()
 
 	testCases := []struct {
 		name            string
-		method          string
 		path            string
 		wantStatus      int
 		wantContentType string
 		wantPageTitle   string
 	}{
 		{
-			name:            "web index page GET",
-			method:          http.MethodGet,
-			path:            "/",
+			name:            "web index page",
+			path:            "/ui",
 			wantStatus:      http.StatusOK,
-			wantContentType: "text/html; charset=utf-8",
+			wantContentType: "text/html",
 			wantPageTitle:   "Toolbox UI",
 		},
 		{
-			name:            "web tools page GET",
-			method:          http.MethodGet,
-			path:            "/tools",
+			name:            "web index page with trailing slash",
+			path:            "/ui/",
 			wantStatus:      http.StatusOK,
-			wantContentType: "text/html; charset=utf-8",
+			wantContentType: "text/html",
+			wantPageTitle:   "Toolbox UI",
+		},
+		{
+			name:            "web tools page",
+			path:            "/ui/tools",
+			wantStatus:      http.StatusOK,
+			wantContentType: "text/html",
+			wantPageTitle:   "Tools View",
+		},
+		{
+			name:            "web tools page with trailing slash",
+			path:            "/ui/tools/",
+			wantStatus:      http.StatusOK,
+			wantContentType: "text/html",
 			wantPageTitle:   "Tools View",
 		},
 	}
+
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			url := ts.URL + tc.path
-			req, err := http.NewRequest(tc.method, url, nil)
+			reqURL := ts.URL + tc.path
+			req, err := http.NewRequest(http.MethodGet, reqURL, nil)
 			if err != nil {
 				t.Fatalf("Failed to create request: %v", err)
 			}
 
-			resp, err := http.DefaultClient.Do(req)
+			client := ts.Client()
+			resp, err := client.Do(req)
 			if err != nil {
 				t.Fatalf("Failed to send request: %v", err)
 			}
 			defer resp.Body.Close()
 
-			body, err := io.ReadAll(resp.Body)
-			if err != nil {
-				t.Fatalf("Failed to read response body: %v", err)
+			if resp.StatusCode != tc.wantStatus {
+				body, _ := io.ReadAll(resp.Body)
+				t.Fatalf("Unexpected status code for %s: got %d, want %d, body: %s", tc.path, resp.StatusCode, tc.wantStatus, string(body))
 			}
 
-			if resp.StatusCode != tc.wantStatus {
-				t.Errorf("Unexpected status code: got %d, want %d, body: %s", resp.StatusCode, tc.wantStatus, string(body))
+			contentType := resp.Header.Get("Content-Type")
+			if !strings.HasPrefix(contentType, tc.wantContentType) {
+				t.Errorf("Unexpected Content-Type header for %s: got %s, want prefix %s", tc.path, contentType, tc.wantContentType)
 			}
 
-			if contentType := resp.Header.Get("Content-Type"); contentType != tc.wantContentType {
-				t.Errorf("Unexpected Content-Type header: got %s, want %s", contentType, tc.wantContentType)
+			body, err := io.ReadAll(resp.Body)
+			if err != nil {
+				t.Fatalf("Failed to read response body: %v", err)
 			}
 
 			doc, err := goquery.NewDocumentFromReader(strings.NewReader(string(body)))
 			if err != nil {
 				t.Fatalf("Failed to parse HTML: %v", err)
 			}
-			gotPageTitle := doc.Find("title").Text()
 
+			gotPageTitle := doc.Find("title").Text()
 			if gotPageTitle != tc.wantPageTitle {
-				t.Errorf("Unexpected page title: got %q, want %q", gotPageTitle, tc.wantPageTitle)
+				t.Errorf("Unexpected page title for %s: got %q, want %q", tc.path, gotPageTitle, tc.wantPageTitle)
 			}
+
+			pageURL := resp.Request.URL
+			verifyLinkedResources(t, ts, pageURL, doc)
 		})
 	}
 }
+
+// verifyLinkedResources checks that resources linked in the HTML are served correctly.
+func verifyLinkedResources(t *testing.T, ts *httptest.Server, pageURL *url.URL, doc *goquery.Document) {
+	t.Helper()
+
+	selectors := map[string]string{
+		"stylesheet": "link[rel=stylesheet]",
+		"script":     "script[src]",
+	}
+
+	attrMap := map[string]string{
+		"stylesheet": "href",
+		"script":     "src",
+	}
+
+	foundResource := false
+	for resourceType, selector := range selectors {
+		doc.Find(selector).Each(func(i int, s *goquery.Selection) {
+			foundResource = true
+			attrName := attrMap[resourceType]
+			resourcePath, exists := s.Attr(attrName)
+			if !exists || resourcePath == "" {
+				t.Errorf("Resource element %s is missing attribute %s on page %s", selector, attrName, pageURL.String())
+				return
+			}
+
+			// Resolve the URL relative to the page URL
+			resURL, err := url.Parse(resourcePath)
+			if err != nil {
+				t.Errorf("Failed to parse resource path %q on page %s: %v", resourcePath, pageURL.String(), err)
+				return
+			}
+			absoluteResourceURL := pageURL.ResolveReference(resURL)
+
+			// Skip external hosts
+			if absoluteResourceURL.Host != pageURL.Host {
+				t.Logf("Skipping resource on different host: %s", absoluteResourceURL.String())
+				return
+			}
+
+			resp, err := ts.Client().Get(absoluteResourceURL.String())
+			if err != nil {
+				t.Errorf("Failed to GET %s resource %s: %v", resourceType, absoluteResourceURL.String(), err)
+				return
+			}
+			defer resp.Body.Close()
+
+			if resp.StatusCode != http.StatusOK {
+				t.Errorf("Resource %s %s: expected status OK (200), but got %d", resourceType, absoluteResourceURL.String(), resp.StatusCode)
+			}
+		})
+	}
+
+	if !foundResource {
+		t.Logf("No stylesheet or script resources found to check on page %s", pageURL.String())
+	}
+}