add 'notes' to Request

tests/test_components.py

@@ -138,14 +138,17 @@ def test_probability_request():
         metadata=ProbabilityMetadata(probability=0.5),
     )
     assert request.get_probability() == 0.5
+    assert request.notes is None
 
     request = ProbabilityRequest(
         name="Get with RequestURL object",
         url=RequestUrl("https://example.com/test"),
+        notes={"type": "test request", "id": 782},
     )
 
     assert request.url == "https://example.com/test"
     assert request.get_probability() is None
+    assert request.notes == {"type": "test request", "id": 782}
 
 
 def test_request():
@@ -154,20 +157,22 @@ def test_request():
         Header(name="Content-Type", value="application/x-www-form-urlencoded"),
         Header(name="Host", value="foo.example"),
     ]
-    Request(
+    request = Request(
         name="Post Test",
         url="https://example.com/test",
         method="POST",
         body="ZmllbGQxPXZhbHVlMSZmaWVsZDI9dmFsdWUy",
         headers=headers,
     )
+    assert request.notes is None
 
     request = Request(
         name="Get with RequestURL object",
         url=RequestUrl("https://example.com/test"),
+        notes={"type": "test request", "id": 782},
     )
-
     assert request.url == "https://example.com/test"
+    assert request.notes == {"type": "test request", "id": 782}
 
 
 def test_job_location():

zyte_common_items/components/request.py

@@ -1,5 +1,5 @@
 import base64
-from typing import List, Optional, Type, TypeVar
+from typing import Any, Dict, List, Optional, Type, TypeVar
 
 import attrs
 
@@ -42,6 +42,9 @@ class Request(Item):
     #: Name of the page being requested.
     name: Optional[str] = None
 
+    #: Arbitrary list of information about the request.
+    notes: Optional[Dict[str, Any]] = None
+
     _body_bytes = None
 
     @property