diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed9b8f89..4d2da481 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,9 +21,14 @@ and start a new "In Progress" section above it.
 
 ## In progress
 
+
+## 0.122.0
+
 - `load_collection`: more consistent cube extent handling when a buffer is applied. ([#334](https://github.com/Open-EO/openeo-python-driver/issues/334))
 - `load_collection`: collapse multiple `load_collection` calls into a single one in cases with buffers. ([#336](https://github.com/Open-EO/openeo-python-driver/issues/336))
 - `export_workspace`: fix `KeyError: 'alternate'` upon merging into existing STAC collection ([Open-EO/openeo-geopyspark-driver#677](https://github.com/Open-EO/openeo-geopyspark-driver/issues/677))
+- Support custom default in `FlaskRequestCorrelationIdLogging.get_request_id()`
+
 
 ## 0.121.0
 
diff --git a/openeo_driver/_version.py b/openeo_driver/_version.py
index 854f51a9..22876e6e 100644
--- a/openeo_driver/_version.py
+++ b/openeo_driver/_version.py
@@ -1 +1 @@
-__version__ = "0.121.0a1"
+__version__ = "0.122.0a1"
diff --git a/openeo_driver/util/logging.py b/openeo_driver/util/logging.py
index 4d0acfb7..3e16675c 100644
--- a/openeo_driver/util/logging.py
+++ b/openeo_driver/util/logging.py
@@ -44,6 +44,10 @@
 LOG_HANDLER_ROTATING_FILE_JSON = "rotating_file_json"
 
 
+# Sentinel value for unset values
+_UNSET = object()
+
+
 def get_logging_config(
     *,
     root_handlers: Optional[List[str]] = None,
@@ -280,12 +284,12 @@ def before_request(cls):
         setattr(flask.g, cls.FLASK_G_ATTR, cls._build_request_id())
 
     @classmethod
-    def get_request_id(cls) -> str:
+    def get_request_id(cls, *, default: Union[str, None] = _UNSET) -> str:
         """Get request correlation id as stored in Flask request global `g`."""
         if flask.has_request_context():
-            return flask.g.get(cls.FLASK_G_ATTR, "n/a")
+            return flask.g.get(cls.FLASK_G_ATTR, default="n/a" if default is _UNSET else default)
         else:
-            return "no-request"
+            return "no-request" if default is _UNSET else default
 
     def filter(self, record: logging.LogRecord) -> bool:
         """Filter a log record (logging.Filter API)."""
diff --git a/tests/util/test_logging.py b/tests/util/test_logging.py
index c8212fed..04202402 100644
--- a/tests/util/test_logging.py
+++ b/tests/util/test_logging.py
@@ -29,7 +29,7 @@
 _log = logging.getLogger(__name__)
 
 
-def test_filter_flask_request_correlation_id_logging():
+def test_flask_request_correlation_id_logging():
     with enhanced_logging(format="[%(req_id)s] %(message)s", context=LOGGING_CONTEXT_FLASK) as logs:
         app = flask.Flask(__name__)
         log = logging.getLogger(__name__)
@@ -53,7 +53,7 @@ def hello():
     assert "[123-456] Watch out!" in logs
 
 
-def test_filter_flask_request_correlation_id_logging_overriding():
+def test_flask_request_correlation_id_logging_overriding():
     """Don't overwrite existing request id."""
     with enhanced_logging(format="[%(req_id)s] %(message)s", context=LOGGING_CONTEXT_FLASK) as logs:
         app = flask.Flask(__name__)
@@ -78,6 +78,30 @@ def hello():
     assert "[hello123] Watch out!" in logs
 
 
+def test_flask_request_correlation_id_get_request_id_default_no_flask_context():
+    assert FlaskRequestCorrelationIdLogging.get_request_id() == "no-request"
+    assert FlaskRequestCorrelationIdLogging.get_request_id(default="nope") == "nope"
+    assert FlaskRequestCorrelationIdLogging.get_request_id(default=None) is None
+
+
+def test_flask_request_correlation_id_logging_default_flask_context():
+    results = []
+
+    app = flask.Flask(__name__)
+
+    @app.route("/hello")
+    def hello():
+        results.append(FlaskRequestCorrelationIdLogging.get_request_id())
+        results.append(FlaskRequestCorrelationIdLogging.get_request_id(default="nope"))
+        results.append(FlaskRequestCorrelationIdLogging.get_request_id(default=None))
+        return "Hello world"
+
+    with app.test_client() as client:
+        client.get("/hello")
+
+    assert results == ["n/a", "nope", None]
+
+
 def test_filter_flask_user_id_logging():
     with enhanced_logging(format="[%(user_id)s] %(message)s", context=LOGGING_CONTEXT_FLASK) as logs:
         app = flask.Flask(__name__)