OIDC discovery is fetched repeatedly for identical configuration #4837

from unittest.mock import MagicMock, patch

from httpx2 import Response
from pydantic import AnyHttpUrl

from fastmcp.server.auth.oidc_proxy import OIDCConfiguration

url = AnyHttpUrl("https://example.com/.well-known/openid-configuration")
document = {
    "issuer": "https://example.com",
    "authorization_endpoint": "https://example.com/authorize",
    "token_endpoint": "https://example.com/token",
    "jwks_uri": "https://example.com/jwks",
    "response_types_supported": ["code"],
    "subject_types_supported": ["public"],
    "id_token_signing_alg_values_supported": ["RS256"],
}

with patch("httpx2.get") as get:
    response = MagicMock(spec=Response)
    response.json.return_value = document
    get.return_value = response

    for _ in range(2):
        OIDCConfiguration.get_oidc_configuration(
            config_url=url,
            strict=True,
            timeout_seconds=10,
        )

    print(get.call_count)  # 2