Connect API errors

Each error response names one of these pages in its type field. Branch on code.

• invalid_request HTTP 400
• unauthenticated HTTP 401
• forbidden HTTP 403
• capability_disabled HTTP 403
• account_inactive HTTP 403
• not_found HTTP 404
• idempotency_conflict HTTP 409
• operation_in_progress HTTP 409
• result_not_ready HTTP 409
• job_failed HTTP 409
• job_cancelled HTTP 409
• version_conflict HTTP 409
• invalid_state HTTP 409
• result_expired HTTP 410
• not_acceptable HTTP 406
• payload_too_large HTTP 413
• unsupported_media_type HTTP 415
• range_not_satisfiable HTTP 416
• request_timeout HTTP 408
• validation_failed HTTP 422
• input_unavailable HTTP 422
• rate_limited HTTP 429
• allowance_exhausted HTTP 429
• internal_error HTTP 500
• capacity_exhausted HTTP 503
• temporarily_unavailable HTTP 503
• identity_unavailable HTTP 503
• maintenance HTTP 503
• outcome_unknown HTTP 504
• storage_quota_exceeded HTTP 507