[Kayvan-Zahiri]

Object keys are interpolated directly into ingress URLs. A key such as customer/123 becomes two path segments; ? starts the query, # moves the handler into a fragment, and a literal %2F is interpreted as an escape instead of remaining part of the key.

Percent-encode the object key as one path segment in both scoped and ordinary ingress routes. Existing service/handler routing and delayed-send query construction remain unchanged.

Added 28 in-memory HTTPX transport cases through Client.generic_call and Client.generic_send: slash, question mark, fragment marker, literal percent escape, space, plain key, and Unicode, each with scoped/unscoped call/send variants. Before the fix, 16 fail and 12 controls pass. All 28 pass afterward, with request paths, fragments, delayed-send queries, payloads, and returned values checked.

Validation on Python 3.12.12 with unchanged uv.lock and all locked extras installed:

• Built the native extension from this checkout using the installed Rust 1.98.0 toolchain.
• 51 local unit tests pass; three Docker-dependent cases deselected. tests/harness.py, tests/ext.py, and tests/servercontext.py also require Docker and were not run. The Docker daemon is unavailable, so full runtime/conformance results are not claimed.
• Full Ruff lint and formatting pass (84 files).
• The repository's Mypy commands pass for SDK, examples, and tests: 48, 10, and 11 files respectively.
• Pyright passes for SDK, examples, tests, and test-services, using the task virtual environment's Python interpreter.
• Source distribution and CPython 3.12 wheel build successfully. The wheel contains the tested restate/client.py and compiled native extension.
• git diff --check passes.

No hosted Restate account or live ingress requests were used; request regressions use httpx.MockTransport. This change addresses reserved characters in object keys; it does not change scope-name handling or empty/dot-segment keys.

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[Kayvan-Zahiri]

I have read the CLA Document and I hereby sign the CLA