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Title: fix: preserve query params in OAuth authorization endpoint by he-yufeng · Pull Request #2781 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: preserve query params in OAuth authorization endpoint by he-yufeng · Pull Request #2781 · modelcontextprotocol/python-sdk

X Title: fix: preserve query params in OAuth authorization endpoint by he-yufeng · Pull Request #2781 · modelcontextprotocol/python-sdk

Description: Summary Fixes #2776. Some OAuth authorization server metadata includes an authorization_endpoint that already has query parameters. The client was building the redirect URL with a raw ?{urlencode(...)} append, which turns endpoints like: https://test.salesforce.com/services/oauth2/authorize?prompt=select_account into a malformed URL with a second question mark before the OAuth request parameters. This uses httpx.URL.copy_merge_params() to add the OAuth request parameters through the URL parser instead of string concatenation, preserving existing endpoint query parameters. Verification uv run --no-sync pytest tests\client\test_auth.py::TestAuthFlow::test_authorization_endpoint_preserves_existing_query_params -q --basetemp .tmp\pytest-2776-one -p no:cacheprovider uv run --no-sync pytest tests\client\test_auth.py -q --basetemp .tmp\pytest-2776-auth -p no:cacheprovider uv run --no-sync ruff check --no-cache src\mcp\client\auth\oauth2.py tests\client\test_auth.py uv run --no-sync ruff format --check --no-cache src\mcp\client\auth\oauth2.py tests\client\test_auth.py uv run --no-sync pyright src\mcp\client\auth\oauth2.py tests\client\test_auth.py git diff --check

Open Graph Description: Summary Fixes #2776. Some OAuth authorization server metadata includes an authorization_endpoint that already has query parameters. The client was building the redirect URL with a raw ?{urlencode(....

X Description: Summary Fixes #2776. Some OAuth authorization server metadata includes an authorization_endpoint that already has query parameters. The client was building the redirect URL with a raw ?{urlencode(....

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2781

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c2c25d9 fix: preserve oauth authorization endpoint query he-yufeng Jun 4, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2781/commits/c2c25d97884816bf48f7dc2ee3ebc6c9a3924b4d
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