feat: support user-defined fallback protocols array - #707

starting build "49782335-20a8-495c-acb4-c392c1aaa082"

FETCHSOURCE
From https://github.com/googleapis/mcp-toolbox-sdk-python
 * branch            ccf7b110676ba03278458140bef4f95267f00f25 -> FETCH_HEAD
HEAD is now at ccf7b11 Add missing test_version_negotiation_raises_fallback to legacy versions
GitCommit:
ccf7b110676ba03278458140bef4f95267f00f25
BUILD
Starting Step #0 - "Install requirements"
Step #0 - "Install requirements": Pulling image: python:3.10
Step #0 - "Install requirements": 3.10: Pulling from library/python
Step #0 - "Install requirements": aa3e9ef32f73: Already exists
Step #0 - "Install requirements": 3f59c84a7863: Already exists
Step #0 - "Install requirements": 30d0db852850: Already exists
Step #0 - "Install requirements": 0252e6abaf0f: Already exists
Step #0 - "Install requirements": 80a4e88782de: Pulling fs layer
Step #0 - "Install requirements": 10a1f22bdca6: Pulling fs layer
Step #0 - "Install requirements": 120ba859d699: Pulling fs layer
Step #0 - "Install requirements": 120ba859d699: Verifying Checksum
Step #0 - "Install requirements": 120ba859d699: Download complete
Step #0 - "Install requirements": 80a4e88782de: Verifying Checksum
Step #0 - "Install requirements": 80a4e88782de: Download complete
Step #0 - "Install requirements": 10a1f22bdca6: Verifying Checksum
Step #0 - "Install requirements": 10a1f22bdca6: Download complete
Step #0 - "Install requirements": 80a4e88782de: Pull complete
Step #0 - "Install requirements": 10a1f22bdca6: Pull complete
Step #0 - "Install requirements": 120ba859d699: Pull complete
Step #0 - "Install requirements": Digest: sha256:41161d378d6f09dec7f9b2cae08fa6874ad98b794723cf2f78c4a378a78b33c0
Step #0 - "Install requirements": Status: Downloaded newer image for python:3.10
Step #0 - "Install requirements": docker.io/library/python:3.10
Step #0 - "Install requirements": Collecting uv
Step #0 - "Install requirements":   Downloading uv-0.11.28-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (27.1 MB)
Step #0 - "Install requirements":      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 27.1/27.1 MB 57.9 MB/s eta 0:00:00
Step #0 - "Install requirements": Installing collected packages: uv
Step #0 - "Install requirements": Successfully installed uv-0.11.28
Step #0 - "Install requirements": WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
Step #0 - "Install requirements": 
Step #0 - "Install requirements": [notice] A new release of pip is available: 23.0.1 -> 26.1.2
Step #0 - "Install requirements": [notice] To update, run: pip install --upgrade pip
Step #0 - "Install requirements": Using CPython 3.10.20 interpreter at: /usr/local/bin/python3
Step #0 - "Install requirements": Creating virtual environment at: /workspace/venv
Step #0 - "Install requirements": Activate with: source /workspace/venv/bin/activate
Step #0 - "Install requirements": Using Python 3.10.20 environment at: /workspace/venv
Step #0 - "Install requirements": Resolved 1 package in 254ms
Step #0 - "Install requirements": Downloading uv (25.9MiB)
Step #0 - "Install requirements":  Downloaded uv
Step #0 - "Install requirements": Prepared 1 package in 667ms
Step #0 - "Install requirements": warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
Step #0 - "Install requirements":          If the cache and target directories are on different filesystems, hardlinking may not be supported.
Step #0 - "Install requirements":          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
Step #0 - "Install requirements": Installed 1 package in 77ms
Step #0 - "Install requirements":  + uv==0.11.28
Step #0 - "Install requirements": Using Python 3.10.20 environment at: /workspace/venv
Step #0 - "Install requirements": Resolved 90 packages in 2.05s
Step #0 - "Install requirements":    Building toolbox-core @ file:///workspace/packages/toolbox-core
Step #0 - "Install requirements": Downloading numpy (17.4MiB)
Step #0 - "Install requirements": Downloading jedi (4.7MiB)
Step #0 - "Install requirements": Downloading aiohttp (1.6MiB)
Step #0 - "Install requirements": Downloading cryptography (4.5MiB)
Step #0 - "Install requirements": Downloading pydantic-core (2.0MiB)
Step #0 - "Install requirements": Downloading grpcio (6.6MiB)
Step #0 - "Install requirements": Downloading ast-serialize (1.2MiB)
Step #0 - "Install requirements": Downloading pygments (1.2MiB)
Step #0 - "Install requirements": Downloading black (1.8MiB)
Step #0 - "Install requirements": Downloading mypy (14.3MiB)
Step #0 - "Install requirements":       Built toolbox-core @ file:///workspace/packages/toolbox-core
Step #0 - "Install requirements":  Downloaded ast-serialize
Step #0 - "Install requirements":  Downloaded aiohttp
Step #0 - "Install requirements":  Downloaded pydantic-core
Step #0 - "Install requirements":  Downloaded black
Step #0 - "Install requirements":  Downloaded grpcio
Step #0 - "Install requirements":  Downloaded cryptography
Step #0 - "Install requirements":  Downloaded pygments
Step #0 - "Install requirements":  Downloaded numpy
Step #0 - "Install requirements":  Downloaded mypy
Step #0 - "Install requirements":  Downloaded jedi
Step #0 - "Install requirements": Prepared 90 packages in 2.84s
Step #0 - "Install requirements": warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
Step #0 - "Install requirements":          If the cache and target directories are on different filesystems, hardlinking may not be supported.
Step #0 - "Install requirements":          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
Step #0 - "Install requirements": Installed 90 packages in 1.36s
Step #0 - "Install requirements":  + aiohappyeyeballs==2.7.1
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Step #0 - "Install requirements":  + wrapt==2.2.2
Step #0 - "Install requirements":  + yarl==1.24.2
Step #0 - "Install requirements":  + zipp==4.1.0
Step #0 - "Install requirements": Using Python 3.10.20 environment at: /workspace/venv
Step #0 - "Install requirements": Resolved 27 packages in 120ms
Step #0 - "Install requirements": Prepared 1 package in 63ms
Step #0 - "Install requirements": Uninstalled 1 package in 3ms
Step #0 - "Install requirements": warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
Step #0 - "Install requirements":          If the cache and target directories are on different filesystems, hardlinking may not be supported.
Step #0 - "Install requirements":          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
Step #0 - "Install requirements": Installed 1 package in 14ms
Step #0 - "Install requirements":  - google-auth==2.55.2
Step #0 - "Install requirements":  + google-auth==2.53.0
Finished Step #0 - "Install requirements"
Starting Step #1 - "Run integration tests"
Step #1 - "Run integration tests": Already have image (with digest): python:3.10
Step #1 - "Run integration tests": ============================= test session starts ==============================
Step #1 - "Run integration tests": platform linux -- Python 3.10.20, pytest-9.0.3, pluggy-1.6.0
Step #1 - "Run integration tests": rootdir: /workspace/packages/toolbox-core
Step #1 - "Run integration tests": configfile: pyproject.toml
Step #1 - "Run integration tests": plugins: cov-7.1.0, aioresponses-0.3.0, mock-3.15.1, asyncio-1.4.0
Step #1 - "Run integration tests": asyncio: mode=strict, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
Step #1 - "Run integration tests": collected 887 items
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/mcp_transport/test_base.py ...................                     [  2%]
Step #1 - "Run integration tests": tests/mcp_transport/test_telemetry.py .................................. [  5%]
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Step #1 - "Run integration tests": tests/mcp_transport/test_v20241105.py .................................. [ 11%]
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Step #1 - "Run integration tests": tests/mcp_transport/test_v20250326.py .................................. [ 16%]
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Step #1 - "Run integration tests": tests/mcp_transport/test_v20250618.py .................................. [ 21%]
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Step #1 - "Run integration tests": tests/mcp_transport/test_v20251125.py .................................. [ 27%]
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Step #1 - "Run integration tests": tests/mcp_transport/test_v20260618.py ..........................         [ 31%]
Step #1 - "Run integration tests": tests/test_auth_methods.py ..........                                    [ 32%]
Step #1 - "Run integration tests": tests/test_client.py .................................                   [ 36%]
Step #1 - "Run integration tests": tests/test_e2e.py ...................................                    [ 40%]
Step #1 - "Run integration tests": tests/test_e2e_mcp.py .................................................. [ 45%]
Step #1 - "Run integration tests": ........................................................................ [ 54%]
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Step #1 - "Run integration tests": tests/test_sync_e2e.py ..............                                    [ 61%]
Step #1 - "Run integration tests": tests/test_e2e.py ...................................                    [ 65%]
Step #1 - "Run integration tests": tests/test_e2e_mcp.py .................................................. [ 70%]
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Step #1 - "Run integration tests": ................................................                         [ 84%]
Step #1 - "Run integration tests": tests/test_sync_e2e.py ..............                                    [ 85%]
Step #1 - "Run integration tests": tests/test_protocol.py .........................                         [ 88%]
Step #1 - "Run integration tests": tests/test_sync_client.py ................                               [ 90%]
Step #1 - "Run integration tests": tests/test_sync_tool.py ....................                             [ 92%]
Step #1 - "Run integration tests": tests/test_tool.py ....................................                  [ 96%]
Step #1 - "Run integration tests": tests/test_utils.py .............................                        [100%]
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": =============================== warnings summary ===============================
Step #1 - "Run integration tests": ../../venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:255
Step #1 - "Run integration tests":   /workspace/venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:255: FutureWarning: You are using a Python version (3.10.20) which Google will stop supporting in new releases of google.api_core once it reaches its end of life (2026-10-04). Please upgrade to the latest Python version, or at least Python 3.11, to continue receiving updates for google.api_core past that date.
Step #1 - "Run integration tests":     warnings.warn(message, FutureWarning)
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": ../../venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:255
Step #1 - "Run integration tests":   /workspace/venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:255: FutureWarning: You are using a Python version (3.10.20) which Google will stop supporting in new releases of google.cloud.secretmanager_v1 once it reaches its end of life (2026-10-04). Please upgrade to the latest Python version, or at least Python 3.11, to continue receiving updates for google.cloud.secretmanager_v1 past that date.
Step #1 - "Run integration tests":     warnings.warn(message, FutureWarning)
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/test_tool.py:550
Step #1 - "Run integration tests":   /workspace/packages/toolbox-core/tests/test_tool.py:550: DeprecationWarning: invalid escape sequence '\('
Step #1 - "Run integration tests":     expected_error_message = "Authentication source\(s\) \`unused-auth-service\` unused by tool \`sample_tool\`."
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/test_client.py: 9 warnings
Step #1 - "Run integration tests": tests/test_e2e.py: 12 warnings
Step #1 - "Run integration tests": tests/test_e2e_mcp.py: 60 warnings
Step #1 - "Run integration tests": tests/test_sync_e2e.py: 10 warnings
Step #1 - "Run integration tests": tests/test_sync_client.py: 4 warnings
Step #1 - "Run integration tests":   /workspace/packages/toolbox-core/src/toolbox_core/utils.py:56: UserWarning: This connection is using HTTP. To prevent credential exposure, please ensure all communication is sent over HTTPS.
Step #1 - "Run integration tests":     warnings.warn(
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/test_sync_client.py::TestSyncClientLifecycle::test_load_tool_raises_if_loop_or_thread_none
Step #1 - "Run integration tests":   /workspace/packages/toolbox-core/tests/test_sync_client.py:342: RuntimeWarning: coroutine 'ToolboxClient.load_tool' was never awaited
Step #1 - "Run integration tests":     with pytest.raises(
Step #1 - "Run integration tests":   Enable tracemalloc to get traceback where the object was allocated.
Step #1 - "Run integration tests":   See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/test_sync_client.py::TestSyncClientLifecycle::test_load_tool_raises_if_loop_or_thread_none
Step #1 - "Run integration tests":   /workspace/packages/toolbox-core/tests/test_sync_client.py:351: RuntimeWarning: coroutine 'ToolboxClient.load_toolset' was never awaited
Step #1 - "Run integration tests":     with pytest.raises(
Step #1 - "Run integration tests":   Enable tracemalloc to get traceback where the object was allocated.
Step #1 - "Run integration tests":   See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
Step #1 - "Run integration tests": ================================ tests coverage ================================
Step #1 - "Run integration tests": _______________ coverage: platform linux, python 3.10.20-final-0 _______________
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": Name                                                Stmts   Miss  Cover
Step #1 - "Run integration tests": -----------------------------------------------------------------------
Step #1 - "Run integration tests": src/toolbox_core/__init__.py                            4      0   100%
Step #1 - "Run integration tests": src/toolbox_core/auth_methods.py                       59      2    97%
Step #1 - "Run integration tests": src/toolbox_core/client.py                            150      4    97%
Step #1 - "Run integration tests": src/toolbox_core/exceptions.py                          6      0   100%
Step #1 - "Run integration tests": src/toolbox_core/itransport.py                         20      5    75%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/__init__.py              6      0   100%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/telemetry.py           153     14    91%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/transport_base.py      107      3    97%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20241105/mcp.py       158     21    87%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20241105/types.py      96      1    99%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20250326/mcp.py       170     25    85%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20250326/types.py      96      1    99%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20250618/mcp.py       160     18    89%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20250618/types.py      96      1    99%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20251125/mcp.py       160     21    87%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20251125/types.py      96      1    99%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20260618/mcp.py       136     17    88%
Step #1 - "Run integration tests": src/toolbox_core/mcp_transport/v20260618/types.py      82      1    99%
Step #1 - "Run integration tests": src/toolbox_core/protocol.py                           76      0   100%
Step #1 - "Run integration tests": src/toolbox_core/sync_client.py                        45      0   100%
Step #1 - "Run integration tests": src/toolbox_core/sync_tool.py                          67      0   100%
Step #1 - "Run integration tests": src/toolbox_core/tool.py                              119      6    95%
Step #1 - "Run integration tests": src/toolbox_core/utils.py                              61      0   100%
Step #1 - "Run integration tests": src/toolbox_core/version.py                             1      0   100%
Step #1 - "Run integration tests": -----------------------------------------------------------------------
Step #1 - "Run integration tests": TOTAL                                                2124    141    93%
Step #1 - "Run integration tests": Required test coverage of 90% reached. Total coverage: 93.36%
Step #1 - "Run integration tests": ====================== 887 passed, 100 warnings in 38.81s ======================
Step #1 - "Run integration tests": /usr/local/lib/python3.10/asyncio/base_events.py:688: ResourceWarning: unclosed event loop <_UnixSelectorEventLoop running=False closed=False debug=False>
Finished Step #1 - "Run integration tests"
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