--- swagger: "2.0" info: title: "Load Balancing Service API" description: API for the Load Balancing Service version: "20170115" basePath: /20170115 paths: /loadBalancers/{loadBalancerId}/backendSets: get: summary: "ListBackendSets" tags: ['loadBalancer'] description: Lists all backend sets associated with a given load balancer. operationId: "ListBackendSets" # fixed that: Missing parameter in path parameters: - name: loadBalancerId in: path type: string # fixed that: should be required required: true produces: - "application/json" responses: