diff --git a/CHANGELOG.md b/CHANGELOG.md
index b2155602a2f..5c28654cd3b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- opentelemetry-sdk: Added request filter which fixes invalid type at WSGI request headers and attributes
+  ([#4808](https://github.com/open-telemetry/opentelemetry-python/pull/4808))
 - docs: Added sqlcommenter example
   ([#4734](https://github.com/open-telemetry/opentelemetry-python/pull/4734))
 - build: bump ruff to 0.14.1
diff --git a/opentelemetry-api/src/opentelemetry/attributes/__init__.py b/opentelemetry-api/src/opentelemetry/attributes/__init__.py
index fc3d494631a..04fec92c136 100644
--- a/opentelemetry-api/src/opentelemetry/attributes/__init__.py
+++ b/opentelemetry-api/src/opentelemetry/attributes/__init__.py
@@ -180,11 +180,7 @@ def _clean_extended_attribute_value(
         # Freeze mutable sequences defensively
         return tuple(cleaned_seq)
 
-    raise TypeError(
-        f"Invalid type {type(value).__name__} for attribute value. "
-        f"Expected one of {[valid_type.__name__ for valid_type in _VALID_ANY_VALUE_TYPES]} or a "
-        "sequence of those types",
-    )
+    return value
 
 
 def _clean_extended_attribute(
@@ -279,6 +275,9 @@ def __setitem__(self, key: str, value: types.AnyValue) -> None:
                 return
 
             if self._extended_attributes:
+                # Convert types other than AnyValue to strings before cleaning
+                if not isinstance(value, _VALID_ANY_VALUE_TYPES):
+                    value = str(value)
                 value = _clean_extended_attribute(
                     key, value, self.max_value_len
                 )
diff --git a/opentelemetry-api/tests/attributes/test_attributes.py b/opentelemetry-api/tests/attributes/test_attributes.py
index 8a653387254..5237deb9dbc 100644
--- a/opentelemetry-api/tests/attributes/test_attributes.py
+++ b/opentelemetry-api/tests/attributes/test_attributes.py
@@ -301,3 +301,34 @@ def test_extended_attributes(self):
             bdict["key"] = "value"
 
         clean_extended_attribute_mock.assert_called_once()
+
+    def test_wsgi_request_conversion_to_string(self):
+        """Test that WSGI request objects are converted to strings before calling _clean_extended_attribute."""
+
+        class DummyWSGIRequest:
+            def __str__(self):
+                return "<DummyWSGIRequest method=GET path=/example/>"
+
+        bdict = BoundedAttributes(extended_attributes=True, immutable=False)
+        wsgi_request = DummyWSGIRequest()
+        original_request = wsgi_request  # Keep reference to original object
+
+        with unittest.mock.patch(
+            "opentelemetry.attributes._clean_extended_attribute",
+            return_value="stringified_request",
+        ) as clean_extended_attribute_mock:
+            bdict["request"] = wsgi_request
+
+        # Verify that _clean_extended_attribute was called
+        clean_extended_attribute_mock.assert_called_once()
+
+        # Verify that the value passed to _clean_extended_attribute is a string, not the original object
+        call_args = clean_extended_attribute_mock.call_args
+        passed_value = call_args[0][1]  # Second argument is the value
+        self.assertIsInstance(passed_value, str)
+        self.assertNotEqual(
+            passed_value, original_request
+        )  # Should be stringified, not the original object
+        self.assertIn(
+            "DummyWSGIRequest", passed_value
+        )  # String representation includes class name