BerriAI/litellm · error · HTTPException

redirect_uris is required to register a client with this ser

Error message

redirect_uris is required to register a client with this server

What it means

Validation in the MCP OAuth registration path: no redirect_uris were supplied (none configured and none derivable from the request base URL), and dynamic client registration requires at least one redirect URI.

Source

Thrown at litellm/proxy/_experimental/mcp_server/discoverable_endpoints.py:1615

        return dummy_return

    if mcp_server.authorization_url is None:
        raise HTTPException(
            status_code=400,
            detail=_endpoint_not_configured_detail(
                mcp_server,
                "authorization url",
                "set Authorization URL and Token URL manually",
                "set Issuer to discover them from the identity provider (RFC 8414)",
            ),
        )

    if mcp_server.registration_url is None:
        return dummy_return

    bridge_relay: Final = _dcr_bridge_relays_client_registration(mcp_server)
    if bridge_relay and not client_redirect_uris:
        raise HTTPException(
            status_code=400,
            detail="redirect_uris is required to register a client with this server",
        )

    register_data: Final = {
        "client_name": client_name,
        "redirect_uris": client_redirect_uris if bridge_relay else [current_redirect_uri],
        "grant_types": grant_types or (["authorization_code", "refresh_token"] if bridge_relay else []),
        "response_types": response_types or (["code"] if bridge_relay else []),
        "token_endpoint_auth_method": token_endpoint_auth_method or ("none" if bridge_relay else ""),
    }
    response: Final = await _post_dcr_registration(
        registration_url=mcp_server.registration_url,
        register_data=register_data,
        server_id=mcp_server.server_id,
    )

    token_response = response.json()

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Include redirect_uris when registering the client with this server.

Example fix

redirect_uris=['https://client.example/callback']

When it happens

Trigger: Thrown at litellm/proxy/_experimental/mcp_server/discoverable_endpoints.py:1615 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/c1a957fe31c70196. Report an issue: GitHub.