diff --git a/app.py b/app.py
index b1fe493..c229336 100644
--- a/app.py
+++ b/app.py
@@ -4,24 +4,25 @@ from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 import json
 
 
-class Handler(BaseHTTPRequestHandler):
-    def do_GET(self):
-        # Initial implementation assumes deployment at the domain root.
-        if self.path == "/api/health":
-            payload = json.dumps({"status": "ok"}).encode("utf-8")
-            self.send_response(200)
-            self.send_header("Content-Type", "application/json")
-        else:
-            payload = json.dumps({"error": "not found"}).encode("utf-8")
-            self.send_response(404)
-            self.send_header("Content-Type", "application/json")
-        self.send_header("Content-Length", str(len(payload)))
-        self.end_headers()
-        self.wfile.write(payload)
+def make_handler(base_path=""):
+    class Handler(BaseHTTPRequestHandler):
+        def do_GET(self):
+            if self.path == base_path + "/api/health":
+                payload = json.dumps({"status": "ok"}).encode("utf-8")
+                self.send_response(200)
+                self.send_header("Content-Type", "application/json")
+            else:
+                payload = json.dumps({"error": "not found"}).encode("utf-8")
+                self.send_response(404)
+                self.send_header("Content-Type", "application/json")
+            self.send_header("Content-Length", str(len(payload)))
+            self.end_headers()
+            self.wfile.write(payload)
+    return Handler
 
 
-def serve(port=0):
-    server = ThreadingHTTPServer(("127.0.0.1", port), Handler)
+def serve(port=0, base_path=""):
+    server = ThreadingHTTPServer(("127.0.0.1", port), make_handler(base_path))
     return server
 
 
diff --git a/replay.py b/replay.py
index 26c5228..757f304 100644
--- a/replay.py
+++ b/replay.py
@@ -16,7 +16,7 @@ def check(profile):
     config = json.loads((ROOT / "config" / f"{profile}.json").read_text())
     base_path = config["public_base_path"]
     path = base_path + "/api/health"
-    server = serve()
+    server = serve(base_path=base_path)
     thread = Thread(target=server.serve_forever, daemon=True)
     thread.start()
     try: