diff --git a/mx_exporter/__init__.py b/mx_exporter/__init__.py
index e68574b..11eb080 100644
--- a/mx_exporter/__init__.py
+++ b/mx_exporter/__init__.py
@@ -71,9 +71,12 @@ def do_GET(self):
             self.wfile.write(html_content.encode("utf-8"))
 
         elif self.path == '/health':
+            body = json.dumps({"status": "ok"}).encode('utf-8')
             self.send_response(200)
-            self.send_header('Content-type', 'application/json')
+            self.send_header('Content-Type', 'application/json')
+            self.send_header('Content-Length', str(len(body)))
             self.end_headers()
+            self.wfile.write(body)
 
         elif self.path == '/json':
             self._handle_json()
diff --git a/tests/test_http_handler.py b/tests/test_http_handler.py
new file mode 100644
index 0000000..ba84c0b
--- /dev/null
+++ b/tests/test_http_handler.py
@@ -0,0 +1,34 @@
+import io
+import sys
+import types
+
+
+stub = types.ModuleType("mx_exporter.mx_exporter")
+stub.MxCollector = object
+sys.modules.setdefault("mx_exporter.mx_exporter", stub)
+
+from mx_exporter import MxExporterHandler
+
+
+def build_handler(path):
+    handler = MxExporterHandler.__new__(MxExporterHandler)
+    handler.path = path
+    handler.request_version = "HTTP/1.1"
+    handler.command = "GET"
+    handler.requestline = "GET %s HTTP/1.1" % path
+    handler.wfile = io.BytesIO()
+    handler.rfile = io.BytesIO()
+    handler.client_address = ("127.0.0.1", 0)
+    handler.server = object()
+    handler.close_connection = False
+    return handler
+
+
+def test_health_endpoint_returns_json_body():
+    handler = build_handler("/health")
+
+    handler.do_GET()
+
+    response = handler.wfile.getvalue()
+    assert b"200 OK" in response
+    assert b'{"status": "ok"}' in response