Citrix NetScaler LB Virtual Server API

openapi: 3.1.0
info:
  title: Citrix NetScaler NITRO REST Authentication LB Virtual Server API
  description: The NITRO (NetScaler Interface Through RESTful Operations) API provides programmatic access to configure, monitor, and manage Citrix NetScaler (ADC) appliances. Built on REST architecture using HTTP/HTTPS, the API supports comprehensive management of application delivery controller features including load balancing virtual servers, content switching virtual servers, system configuration, and appliance-level settings. All NITRO operations are logged to /var/nitro.log on the appliance.
  version: '14.1'
  contact:
    name: NetScaler Support
    url: https://support.citrix.com/
  license:
    name: Proprietary
    url: https://www.cloud.com/legal
  termsOfService: https://www.cloud.com/legal
servers:
- url: https://{nsip}/nitro/v1
  description: NetScaler NITRO API endpoint
  variables:
    nsip:
      default: netscaler.example.com
      description: The IP address or hostname of the NetScaler appliance (NSIP).
security:
- nitroAuthToken: []
- nitroBasicAuth: []
tags:
- name: LB Virtual Server
  description: Load balancing virtual servers accept incoming traffic and distribute it across backend services using configurable load balancing methods such as round robin, least connections, and more.
paths:
  /config/lbvserver:
    get:
      operationId: listLbVservers
      summary: Citrix Netscaler List Load Balancing Virtual Servers
      description: Retrieves all load balancing virtual server configurations. Supports filtering, pagination, attribute selection, and summary/detail views.
      tags:
      - LB Virtual Server
      parameters:
      - $ref: '#/components/parameters/Attrs'
      - $ref: '#/components/parameters/Filter'
      - $ref: '#/components/parameters/View'
      - $ref: '#/components/parameters/Count'
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageNo'
      responses:
        '200':
          description: Successful retrieval of load balancing virtual servers.
          content:
            application/json:
              schema:
                type: object
                properties:
                  lbvserver:
                    type: array
                    items:
                      $ref: '#/components/schemas/LbVserver'
              examples:
                Listlbvservers200Example:
                  summary: Default listLbVservers 200 response
                  x-microcks-default: true
                  value:
                    lbvserver:
                    - name: Example Title
                      servicetype: HTTP
                      ipv46: example_value
                      port: 10
                      ipset: example_value
                      range: 10
                      ippattern: example_value
                      ipmask: example_value
                      td: 10
                      lbmethod: ROUNDROBIN
                      hashlength: 10
                      netmask: example_value
                      v6netmasklen: 10
                      backuplbmethod: ROUNDROBIN
                      persistencetype: SOURCEIP
                      persistmask: example_value
                      v6persistmasklen: 10
                      persistencebackup: SOURCEIP
                      timeout: 10
                      persistavpno:
                      - {}
                      cookiename: example_value
                      rule: example_value
                      listenpolicy: example_value
                      listenpriority: 10
                      resrule: example_value
                      push: ENABLED
                      pushlabel: example_value
                      pushmulticlients: 'YES'
                      comment: example_value
                      clttimeout: 10
                      somethod: CONNECTION
                      sopersistence: ENABLED
                      sopersistencetimeout: 10
                      sothreshold: 10
                      healththreshold: 10
                      redirecturl: https://www.example.com
                      downstateflush: ENABLED
                      disableprimaryondown: ENABLED
                      insertvserveripport: 'OFF'
                      vipheader: example_value
                      authenticationhost: example_value
                      authentication: 'ON'
                      authn401: 'ON'
                      authnvsname: example_value
                      icmpvsrresponse: PASSIVE
                      rhistate: PASSIVE
                      newservicerequest: 10
                      newservicerequestunit: PER_SECOND
                      newservicerequestincrementinterval: 10
                      minautoscalemembers: 10
                      maxautoscalemembers: 10
                      skippersistency: Bypass
                      appflowlog: ENABLED
                      state: ENABLED
                      connfailover: DISABLED
                      redirurl: https://www.example.com
                      curstate: UP
                      effectivestate: UP
                      status: 10
                      lbrrreason: 10
                      totalservices: 10
                      activeservices: 10
                      statechangetimesec: example_value
                      tickssincelaststatechange: 10
                      health: 10
                      isgslb: true
        '401':
          $ref: '#/components/responses/Unauthorized'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    post:
      operationId: createLbVserver
      summary: Citrix Netscaler Create a Load Balancing Virtual Server
      description: Creates a new load balancing virtual server with the specified configuration. The name and servicetype properties are required. Supports bulk creation by passing an array.
      tags:
      - LB Virtual Server
      parameters:
      - $ref: '#/components/parameters/BulkErrorHandling'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - lbvserver
              properties:
                lbvserver:
                  oneOf:
                  - $ref: '#/components/schemas/LbVserver'
                  - type: array
                    items:
                      $ref: '#/components/schemas/LbVserver'
            example:
              lbvserver:
                name: MyFirstLbVServer
                servicetype: HTTP
                ipv46: 10.102.29.88
                port: 80
                lbmethod: ROUNDROBIN
      responses:
        '201':
          description: Load balancing virtual server created successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NitroResponse'
              examples:
                Createlbvserver201Example:
                  summary: Default createLbVserver 201 response
                  x-microcks-default: true
                  value:
                    errorcode: 10
                    message: example_value
                    severity: NONE
        '207':
          description: Multi-status response for bulk operations where some items may have succeeded and others failed.
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '409':
          description: Resource already exists. A virtual server with the specified name is already configured.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /config/lbvserver/{name}:
    get:
      operationId: getLbVserver
      summary: Citrix Netscaler Get a Specific Load Balancing Virtual Server
      description: Retrieves the configuration of a specific load balancing virtual server identified by name.
      tags:
      - LB Virtual Server
      parameters:
      - name: name
        in: path
        required: true
        description: Name of the load balancing virtual server.
        schema:
          type: string
          minLength: 1
        example: Example Title
      - $ref: '#/components/parameters/Attrs'
      responses:
        '200':
          description: Successful retrieval of the virtual server.
          content:
            application/json:
              schema:
                type: object
                properties:
                  lbvserver:
                    type: array
                    items:
                      $ref: '#/components/schemas/LbVserver'
                    minItems: 1
                    maxItems: 1
              examples:
                Getlbvserver200Example:
                  summary: Default getLbVserver 200 response
                  x-microcks-default: true
                  value:
                    lbvserver:
                    - name: Example Title
                      servicetype: HTTP
                      ipv46: example_value
                      port: 10
                      ipset: example_value
                      range: 10
                      ippattern: example_value
                      ipmask: example_value
                      td: 10
                      lbmethod: ROUNDROBIN
                      hashlength: 10
                      netmask: example_value
                      v6netmasklen: 10
                      backuplbmethod: ROUNDROBIN
                      persistencetype: SOURCEIP
                      persistmask: example_value
                      v6persistmasklen: 10
                      persistencebackup: SOURCEIP
                      timeout: 10
                      persistavpno:
                      - {}
                      cookiename: example_value
                      rule: example_value
                      listenpolicy: example_value
                      listenpriority: 10
                      resrule: example_value
                      push: ENABLED
                      pushlabel: example_value
                      pushmulticlients: 'YES'
                      comment: example_value
                      clttimeout: 10
                      somethod: CONNECTION
                      sopersistence: ENABLED
                      sopersistencetimeout: 10
                      sothreshold: 10
                      healththreshold: 10
                      redirecturl: https://www.example.com
                      downstateflush: ENABLED
                      disableprimaryondown: ENABLED
                      insertvserveripport: 'OFF'
                      vipheader: example_value
                      authenticationhost: example_value
                      authentication: 'ON'
                      authn401: 'ON'
                      authnvsname: example_value
                      icmpvsrresponse: PASSIVE
                      rhistate: PASSIVE
                      newservicerequest: 10
                      newservicerequestunit: PER_SECOND
                      newservicerequestincrementinterval: 10
                      minautoscalemembers: 10
                      maxautoscalemembers: 10
                      skippersistency: Bypass
                      appflowlog: ENABLED
                      state: ENABLED
                      connfailover: DISABLED
                      redirurl: https://www.example.com
                      curstate: UP
                      effectivestate: UP
                      status: 10
                      lbrrreason: 10
                      totalservices: 10
                      activeservices: 10
                      statechangetimesec: example_value
                      tickssincelaststatechange: 10
                      health: 10
                      isgslb: true
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Virtual server not found.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    put:
      operationId: updateLbVserver
      summary: Citrix Netscaler Update a Load Balancing Virtual Server
      description: Updates the configuration of an existing load balancing virtual server. Retrieve the current state, modify properties locally, and upload the complete updated state.
      tags:
      - LB Virtual Server
      parameters:
      - name: name
        in: path
        required: true
        description: Name of the load balancing virtual server to update.
        schema:
          type: string
          minLength: 1
        example: Example Title
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - lbvserver
              properties:
                lbvserver:
                  $ref: '#/components/schemas/LbVserver'
            example:
              lbvserver:
                name: MyFirstLbVServer
                lbmethod: LEASTCONNECTION
                comment: Updated via NITRO API
      responses:
        '200':
          description: Virtual server updated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NitroResponse'
              examples:
                Updatelbvserver200Example:
                  summary: Default updateLbVserver 200 response
                  x-microcks-default: true
                  value:
                    errorcode: 10
                    message: example_value
                    severity: NONE
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Virtual server not found.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    delete:
      operationId: deleteLbVserver
      summary: Citrix Netscaler Delete a Load Balancing Virtual Server
      description: Deletes a load balancing virtual server identified by name.
      tags:
      - LB Virtual Server
      parameters:
      - name: name
        in: path
        required: true
        description: Name of the load balancing virtual server to delete.
        schema:
          type: string
          minLength: 1
        example: Example Title
      responses:
        '200':
          description: Virtual server deleted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NitroResponse'
              examples:
                Deletelbvserver200Example:
                  summary: Default deleteLbVserver 200 response
                  x-microcks-default: true
                  value:
                    errorcode: 10
                    message: example_value
                    severity: NONE
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Virtual server not found.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /config/lbvserver_service_binding:
    put:
      operationId: bindServiceToLbVserver
      summary: Citrix Netscaler Bind a Service to a Load Balancing Virtual Server
      description: Binds a backend service to a load balancing virtual server, allowing the virtual server to distribute traffic to that service.
      tags:
      - LB Virtual Server
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - lbvserver_service_binding
              properties:
                lbvserver_service_binding:
                  $ref: '#/components/schemas/LbVserverServiceBinding'
            example:
              lbvserver_service_binding:
                name: MyFirstLbVServer
                servicename: svc_prod
                weight: 20
      responses:
        '200':
          description: Service bound successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NitroResponse'
              examples:
                Bindservicetolbvserver200Example:
                  summary: Default bindServiceToLbVserver 200 response
                  x-microcks-default: true
                  value:
                    errorcode: 10
                    message: example_value
                    severity: NONE
        '401':
          $ref: '#/components/responses/Unauthorized'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /config/lbvserver_service_binding/{name}:
    get:
      operationId: getLbVserverServiceBindings
      summary: Citrix Netscaler Get Service Bindings for a Load Balancing Virtual Server
      description: Retrieves all services bound to a specific load balancing virtual server.
      tags:
      - LB Virtual Server
      parameters:
      - name: name
        in: path
        required: true
        description: Name of the load balancing virtual server.
        schema:
          type: string
        example: Example Title
      responses:
        '200':
          description: Successful retrieval of service bindings.
          content:
            application/json:
              schema:
                type: object
                properties:
                  lbvserver_service_binding:
                    type: array
                    items:
                      $ref: '#/components/schemas/LbVserverServiceBinding'
              examples:
                Getlbvserverservicebindings200Example:
                  summary: Default getLbVserverServiceBindings 200 response
                  x-microcks-default: true
                  value:
                    lbvserver_service_binding:
                    - name: Example Title
                      servicename: example_value
                      weight: 10
                      servicetype: example_value
                      curstate: example_value
                      ipv46: example_value
                      port: 10
                      dynamicweight: 10
        '401':
          $ref: '#/components/responses/Unauthorized'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    delete:
      operationId: unbindServiceFromLbVserver
      summary: Citrix Netscaler Unbind a Service From a Load Balancing Virtual Server
      description: Removes the binding between a service and a load balancing virtual server.
      tags:
      - LB Virtual Server
      parameters:
      - name: name
        in: path
        required: true
        description: Name of the load balancing virtual server.
        schema:
          type: string
        example: Example Title
      - name: args
        in: query
        required: true
        description: Arguments to identify the service binding to remove, in the format servicename:svc_prod.
        schema:
          type: string
        example: example_value
      responses:
        '200':
          description: Service unbound successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NitroResponse'
              examples:
                Unbindservicefromlbvserver200Example:
                  summary: Default unbindServiceFromLbVserver 200 response
                  x-microcks-default: true
                  value:
                    errorcode: 10
                    message: example_value
                    severity: NONE
        '401':
          $ref: '#/components/responses/Unauthorized'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    LbVserverServiceBinding:
      type: object
      description: Binding between a load balancing virtual server and a backend service. This allows the virtual server to distribute traffic to the bound service.
      properties:
        name:
          type: string
          description: Name of the load balancing virtual server to which the service is bound.
          example: Example Title
        servicename:
          type: string
          description: Name of the service to bind to the virtual server.
          example: example_value
        weight:
          type: integer
          description: Weight assigned to the service for weighted load balancing. Range 1-100.
          minimum: 1
          maximum: 100
          example: 10
        servicetype:
          type: string
          description: Protocol type of the bound service.
          readOnly: true
          example: example_value
        curstate:
          type: string
          description: Current state of the bound service.
          readOnly: true
          example: example_value
        ipv46:
          type: string
          description: IP address of the bound service.
          readOnly: true
          example: example_value
        port:
          type: integer
          description: Port of the bound service.
          readOnly: true
          example: 10
        dynamicweight:
          type: integer
          description: Dynamic weight of the service based on server health.
          readOnly: true
          example: 10
    NitroResponse:
      type: object
      description: Standard NITRO API success response.
      properties:
        errorcode:
          type: integer
          description: Error code. 0 indicates success.
          examples:
          - 0
        message:
          type: string
          description: Human-readable message describing the result.
          examples:
          - Done
        severity:
          type: string
          description: Severity level of the response.
          enum:
          - NONE
          - ERROR
          - WARNING
          example: NONE
    LbVserver:
      type: object
      description: A load balancing virtual server configuration that accepts incoming client traffic and distributes it across bound backend services using a configured load balancing algorithm.
      required:
      - name
      - servicetype
      properties:
        name:
          type: string
          description: Name for the load balancing virtual server. Must be unique and begin with a letter, number, or underscore. Maximum 127 characters.
          minLength: 1
          maxLength: 127
          example: Example Title
        servicetype:
          type: string
          description: Protocol of the service running on the virtual server.
          enum:
          - HTTP
          - FTP
          - TCP
          - UDP
          - SSL
          - SSL_BRIDGE
          - SSL_TCP
          - DTLS
          - NNTP
          - DNS
          - DHCPRA
          - ANY
          - SIP_UDP
          - SIP_TCP
          - SIP_SSL
          - DNS_TCP
          - RTSP
          - PUSH
          - SSL_PUSH
          - RADIUS
          - RDP
          - MYSQL
          - MSSQL
          - DIAMETER
          - SSL_DIAMETER
          - TFTP
          - ORACLE
          - SMPP
          - SYSLOGTCP
          - SYSLOGUDP
          - FIX
          - SSL_FIX
          - PROXY
          - USER_TCP
          - USER_SSL_TCP
          - QUIC
          - IPFIX
          - LOGSTREAM
          - MONGO
          - MONGO_TLS
          - MQTT
          - MQTT_TLS
          - QUIC_BRIDGE
          - HTTP_QUIC
          example: HTTP
        ipv46:
          type: string
          description: IPv4 or IPv6 address to assign to the virtual server. Usually a VIP address on the NetScaler used as the entry point for client traffic.
          example: example_value
        port:
          type: integer
          description: Port number on which the virtual server listens.
          minimum: 0
          maximum: 65535
          example: 10
        ipset:
          type: string
          description: Name of the IP set to bind to the virtual server. Provides multiple IPs for the virtual server.
          example: example_value
        range:
          type: integer
          description: Number of IP addresses that the appliance must generate using the virtual server VIP address and the netmask. Range 2-254.
          minimum: 2
          maximum: 254
          example: 10
        ippattern:
          type: string
          description: IP address pattern for identifying packets to be accepted by the virtual server. Used with ipmask.
          example: example_value
        ipmask:
          type: string
          description: IP address mask with the IP pattern to form an IP address range for the virtual server.
          example: example_value
        td:
          type: integer
          description: Traffic domain identifier. Isolates traffic across virtual servers. Range 0-4094.
          minimum: 0
          maximum: 4094
          example: 10
        lbmethod:
          type: string
          description: Load balancing method used to select the backend service for each client request.
          enum:
          - ROUNDROBIN
          - LEASTCONNECTION
          - LEASTRESPONSETIME
          - URLHASH
          - DOMAINHASH
          - DESTINATIONIPHASH
          - SOURCEIPHASH
          - SRCIPDESTIPHASH
          - LEASTBANDWIDTH
          - LEASTPACKETS
          - TOKEN
          - SRCIPSRCPORTHASH
          - LRTM
          - CALLIDHASH
          - CUSTOMLOAD
          - LEASTREQUEST
          - AUDITLOGHASH
          - STATICPROXIMITY
          default: LEASTCONNECTION
          example: ROUNDROBIN
        hashlength:
          type: integer
          description: Number of bytes to use for the hash value in hash-based load balancing methods. Range 1-4096.
          minimum: 1
          maximum: 4096
          default: 80
          example: 10
        netmask:
          type: string
          description: IPv4 subnet mask for hashing in SOURCEIPHASH, DESTINATIONIPHASH, and SRCIPDESTIPHASH methods.
          example: example_value
        v6netmasklen:
          type: integer
          description: Number of bits in the IPv6 prefix for hash-based LB methods. Range 1-128.
          minimum: 1
          maximum: 128
          default: 128
          example: 10
        backuplbmethod:
          type: string
          description: Backup load balancing method used when the primary method fails to select a service.
          enum:
          - ROUNDROBIN
          - LEASTCONNECTION
          - LEASTRESPONSETIME
          - SOURCEIPHASH
          - CUSTOMLOAD
          default: ROUNDROBIN
          example: ROUNDROBIN
        persistencetype:
          type: string
          description: Type of persistence for the virtual server. Ensures requests from the same client go to the same service.
          enum:
          - SOURCEIP
          - COOKIEINSERT
          - SSLSESSION
          - RULE
          - URLPASSIVE
          - CUSTOMSERVERID
          - DESTIP
          - SRCIPDESTIP
          - CALLID
          - RTSPSID
          - DIAMETER
          - FIXSESSION
          - USERSESSION
          - NONE
          example: SOURCEIP
        persistmask:
          type: string
          description: IPv4 netmask for source IP persistence. Applied to the source IP before matching for persistence.
          example: example_value
        v6persistmasklen:
          type: integer
          description: IPv6 prefix length for source IP persistence. Range 1-128.
          minimum: 1
          maximum: 128
          default: 128
          example: 10
        persistencebackup:
          type: string
          description: Backup persistence type for the virtual server.
          enum:
          - SOURCEIP
          - NONE
          example: SOURCEIP
        timeout:
          type: integer
          description: Persistence timeout in minutes. The period for which persistence sessions are maintained. Range 0-1440.
          minimum: 0
          maximum: 1440
          default: 2
          example: 10
        persistavpno:
          type: array
          description: AVP numbers to use for Diameter persistence.
          items:
            type: integer
          example: []
        cookiename:
          type: string
          description: Name of the cookie generated by the NetScaler for cookie insert persistence.
          example: example_value
        rule:
          type: string
          description: Expression or name of a named expression that the virtual server uses to evaluate client requests. Default is true.
          default: '"none"'
          example: example_value
        listenpolicy:
          type: string
          description: Expression identifying traffic accepted by the virtual server. Default is NONE.
          default: NONE
          example: example_value
        listenpriority:
          type: integer
          description: Priority of the listen policy. Range 0-100.
          minimum: 0
          maximum: 100
          default: 101
          example: 10
        resrule:
          type: string
          description: Expression specifying which response to send when the virtual server matches the client request rule.
          default: '"none"'
          example: example_value
        push:
          type: string
          description: Process traffic with the push virtual server bound to this virtual server.
          enum:
          - ENABLED
          - DISABLED
          default: DISABLED
          example: ENABLED
        pushlabel:
          type: string
          description: Expression for extracting a label from the request. Used by the push virtual server.
          example: example_value
        pushmulticlients:
          type: string
          description: Allow multiple clients to connect to the push virtual server.
          enum:
          - 'YES'
          - 'NO'
          default: 'NO'
          example: 'YES'
        comment:
          type: string
          description: Informational description or comments about the virtual server.
          example: example_value
        clttimeout:
          type: integer
          description: Client idle timeout in seconds. Time to wait before closing an idle client connection. Range 0-31536000.
          minimum: 0
          maximum: 31536000
          example: 10
        somethod:
          type: string
          description: Spillover method. Defines the condition under which traffic spills over to the backup virtual server.
          enum:
          - CONNECTION
          - DYNAMICCONNECTION
          - BANDWIDTH
          - HEALTH
          - NONE
          example: CONNECTION
        sopersistence:
          type: string
          description: Whether to maintain persistence when spillover occurs.
          enum:
          - ENABLED
          - DISABLED
          default: DISABLED
          example: ENABLED
        sopersistencetimeout:
          type: integer
          description: Persistence timeout in minutes during spillover. Range 2-1440.
          minimum: 2
          maximum: 1440
          default: 2
          example: 10
        sothreshold:
          type: integer
          description: Threshold value for the spillover method. Meaning varies based on somethod selected.
          minimum: 1
          example: 10
        healththreshold:
          type: integer
          description: Minimum percentage of UP services required to consider the virtual server as UP. Range 0-100.
          minimum: 0
          maximum: 100
          default: 0
          example: 10
        redirecturl:
          type: string
          description: URL to which requests are redirected when all services bound to the virtual server are DOWN.
          example: https://www.example.com
        downstateflush:
          type: string
          description: Flush all active transactions on all services bound to the virtual server when the state changes to DOWN.
          enum:
          - ENABLED
          - DISABLED
          default: ENABLED
          example: ENABLED
        disableprimaryondown:
          type: string
          description: When a virtual server goes DOWN, remain the primary virtual server in the HA pair so clients continue to connect.
          enum:
          - ENABLED
          - DISABLED
          default: DISABLED
          example: ENABLED
        insertvserveripport:
          type: string
          description: Insert the virtual server IP address and port in the request header.
          enum:
          - 'OFF'
          - VIPADDR
          - V6TOV4MAPPING
          example: 'OFF'
        vipheader:
          type: string
          description: Name of the HTTP header used to insert the virtual server IP and port.
          example: e

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# Full source: https://raw.githubusercontent.com/api-evangelist/citrix-netscaler/refs/heads/main/openapi/citrix-netscaler-lb-virtual-server-api-openapi.yml