MCP proxy fails with jwks_uri error message

[juanluisbaptiste]

Hi, I'm testing the MCP oauth proxy with the official Grafana MCP, but when trying to use it through a client like Cline, I get this error:

[ { "validation": "url", "code": "invalid_string", "message": "Invalid url", "path": [ "jwks_uri" ] },
  { "code": "custom", "message": "URL must be parseable", "fatal": true, "path": [ "jwks_uri" ] } ]

This is my docker-compose file:

services:
    grafana-mcp:
        image: mcp/grafana:latest
        container_name: grafana-mcp
        ports:
            - 8000:8000
        env_file: .env
        command: ["-t", "streamable-http"]
    postgres:
        image: postgres:15
        environment:
            POSTGRES_DB: oauth_proxy
            POSTGRES_USER: oauth_user
            POSTGRES_PASSWORD: oauth_password
        volumes:
            - ./volumes/postgres:/var/lib/postgresql/data
        ports:
            - "5432:5432"
    mcp-oauth-proxy:
        image: ghcr.io/obot-platform/mcp-oauth-proxy:latest
        container_name: mcp-oauth-proxy
        ports:
            - 8080:8080
        env_file: .env
        environment:
            OAUTH_AUTHORIZE_URL: https://accounts.google.com
            SCOPES_SUPPORTED: openid,email,profile,https://www.googleapis.com/auth/cloud-platform
            MCP_SERVER_URL: http://localhost:8000
            DATABASE_DSN: "postgres://oauth_user:oauth_password@postgres:5432/oauth_proxy?sslmode=disable"
        depends_on:
            - postgres
        restart: on-failure:10

PS: I'm testing with PostgreSQL because the current image fails with this error:

mcp-oauth-proxy  | 2025/12/04 16:14:12 DATABASE_DSN not set, using SQLite database at data/oauth_proxy.db
mcp-oauth-proxy  | 2025/12/04 16:14:12 Failed to create OAuth proxy: failed to initialize database: failed to open database: Binary was compiled with 'CGO_ENABLED=0', go-sqlite3 requires cgo to work. This is a stub