Method: regionBackendServices.list

Retrieves the list of regional BackendService resources available to the specified project in the given region.

HTTP request

GET https://www.googleapis.com/compute/v1/projects/{project}/regions/{region}/backendServices

The URL uses gRPC Transcoding syntax.

Path parameters

Parameters
project

string

Project ID for this request.

region

string

Name of the region scoping this request.

Query parameters

Parameters
maxResults

number (uint32 format)

The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)

pageToken

string

Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.

filter

string

A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.

For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.

You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.

To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).

orderBy

string

Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.

You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.

Currently, only sorting by name or creationTimestamp desc is supported.

Request body

The request body must be empty.

Response body

If successful, the response body contains data with the following structure:

JSON representation
{
  "id": string,
  "items": [
    {
      "id": string,
      "creationTimestamp": string,
      "name": string,
      "description": string,
      "selfLink": string,
      "backends": [
        {
          "description": string,
          "group": string,
          "balancingMode": enum,
          "maxUtilization": number,
          "maxRate": number,
          "maxRatePerInstance": number,
          "maxRatePerEndpoint": number,
          "maxConnections": number,
          "maxConnectionsPerInstance": number,
          "maxConnectionsPerEndpoint": number,
          "capacityScaler": number
        }
      ],
      "healthChecks": [
        string
      ],
      "timeoutSec": number,
      "port": number,
      "protocol": enum,
      "fingerprint": string,
      "portName": string,
      "enableCDN": boolean,
      "sessionAffinity": enum,
      "affinityCookieTtlSec": number,
      "region": string,
      "loadBalancingScheme": enum,
      "connectionDraining": {
        "drainingTimeoutSec": number
      },
      "iap": {
        "enabled": boolean,
        "oauth2ClientId": string,
        "oauth2ClientSecret": string,
        "oauth2ClientSecretSha256": string
      },
      "cdnPolicy": {
        "cacheKeyPolicy": {
          "includeProtocol": boolean,
          "includeHost": boolean,
          "includeQueryString": boolean,
          "queryStringWhitelist": [
            string
          ],
          "queryStringBlacklist": [
            string
          ]
        },
        "signedUrlKeyNames": [
          string
        ],
        "signedUrlCacheMaxAgeSec": string
      },
      "customRequestHeaders": [
        string
      ],
      "securityPolicy": string,
      "kind": string
    }
  ],
  "nextPageToken": string,
  "selfLink": string,
  "warning": {
    "code": enum,
    "message": string,
    "data": [
      {
        "key": string,
        "value": string
      }
    ]
  },
  "kind": string
}
Fields
id

string

[Output Only] Unique identifier for the resource; defined by the server.

items[]

object

A list of BackendService resources.

items[].id

string (fixed64 format)

[Output Only] The unique identifier for the resource. This identifier is defined by the server.

items[].creationTimestamp

string

[Output Only] Creation timestamp in RFC3339 text format.

items[].name

string

Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression [a-z]([-a-z0-9]*[a-z0-9])? which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.

items[].description

string

An optional description of this resource. Provide this property when you create the resource.

items[].selfLink

string

[Output Only] Server-defined URL for the resource.

items[].backends[]

object

The list of backends that serve this BackendService.

items[].backends[].description

string

An optional description of this resource. Provide this property when you create the resource.

items[].backends[].group

string

The fully-qualified URL of an instance group or network endpoint group (NEG) resource. The type of backend that a backend service supports depends on the backend service's loadBalancingScheme.

  • When the loadBalancingScheme for the backend service is EXTERNAL, INTERNAL_SELF_MANAGED, or INTERNAL_MANAGED, the backend can be either an instance group or a NEG. The backends on the backend service must be either all instance groups or all NEGs. You cannot mix instance group and NEG backends on the same backend service.
  • When the loadBalancingScheme for the backend service is INTERNAL, the backend must be an instance group in the same region as the backend service. NEGs are not supported.

You must use the fully-qualified URL (starting with https://www.googleapis.com/) to specify the instance group or NEG. Partial URLs are not supported.

items[].backends[].balancingMode

enum

Specifies the balancing mode for the backend.

When choosing a balancing mode, you need to consider the loadBalancingScheme, and protocol for the backend service, as well as the type of backend (instance group or NEG).

  • If the load balancing mode is CONNECTION, then the load is spread based on how many concurrent connections the backend can handle.

    The CONNECTION balancing mode is only available if the protocol for the backend service is SSL, TCP, or UDP.

    If the loadBalancingScheme for the backend service is EXTERNAL (SSL Proxy and TCP Proxy load balancers), you must also specify exactly one of the following parameters: maxConnections, maxConnectionsPerInstance, or maxConnectionsPerEndpoint.

    If the loadBalancingScheme for the backend service is INTERNAL (internal TCP/UDP load balancers), you cannot specify any additional parameters.

  • If the load balancing mode is RATE, then the load is spread based on the rate of HTTP requests per second (RPS).

    The RATE balancing mode is only available if the protocol for the backend service is HTTP or HTTPS. You must specify exactly one of the following parameters: maxRate, maxRatePerInstance, or maxRatePerEndpoint.

  • If the load balancing mode is UTILIZATION, then the load is spread based on the CPU utilization of instances in an instance group.

    The UTILIZATION balancing mode is only available if the loadBalancingScheme of the backend service is EXTERNAL, INTERNAL_SELF_MANAGED, or INTERNAL_MANAGED and the backend is made up of instance groups. There are no restrictions on the backend service protocol.

items[].backends[].maxUtilization

number

Defines the maximum average CPU utilization of a backend VM in an instance group. The valid range is [0.0, 1.0]. This is an optional parameter if the backend's balancingMode is UTILIZATION.

This parameter can be used in conjunction with maxRate, maxRatePerInstance, maxConnections, or maxConnectionsPerInstance.

items[].backends[].maxRate

number

The max requests per second (RPS) of the group. Can be used with either RATE or UTILIZATION balancing modes, but required if RATE mode. For RATE mode, either maxRate or maxRatePerInstance must be set.

This cannot be used for internal load balancing.

items[].backends[].maxRatePerInstance

number

Defines a maximum target for requests per second (RPS) for a single VM in a backend instance group. This is multiplied by the number of instances in the instance group to implicitly calculate a target maximum rate for the whole instance group.

If the backend's balancingMode is UTILIZATION, this is an optional parameter. If the backend's balancingMode is RATE, you must specify either this parameter, maxRate, or maxRatePerEndpoint.

Not available if the backend's balancingMode is CONNECTION.

items[].backends[].maxRatePerEndpoint

number

Defines a maximum target for requests per second (RPS) for an endpoint of a NEG. This is multiplied by the number of endpoints in the NEG to implicitly calculate a target maximum rate for the NEG.

If the backend's balancingMode is RATE, you must specify either this parameter, maxRate, or maxRatePerInstance.

Not available if the backend's balancingMode is CONNECTION.

items[].backends[].maxConnections

number

Defines a maximum target for simultaneous connections for the entire backend (instance group or NEG). If the backend's balancingMode is UTILIZATION, this is an optional parameter. If the backend's balancingMode is CONNECTION, and backend is attached to a backend service whose loadBalancingScheme is EXTERNAL, you must specify either this parameter, maxConnectionsPerInstance, or maxConnectionsPerEndpoint.

Not available if the backend's balancingMode is RATE. If the loadBalancingScheme is INTERNAL, then maxConnections is not supported, even though the backend requires a balancing mode of CONNECTION.

items[].backends[].maxConnectionsPerInstance

number

Defines a maximum target for simultaneous connections for a single VM in a backend instance group. This is multiplied by the number of instances in the instance group to implicitly calculate a target maximum number of simultaneous connections for the whole instance group. If the backend's balancingMode is UTILIZATION, this is an optional parameter. If the backend's balancingMode is CONNECTION, and backend is attached to a backend service whose loadBalancingScheme is EXTERNAL, you must specify either this parameter, maxConnections, or maxConnectionsPerEndpoint.

Not available if the backend's balancingMode is RATE. Internal TCP/UDP load balancing does not support setting maxConnectionsPerInstance even though its backends require a balancing mode of CONNECTION.

items[].backends[].maxConnectionsPerEndpoint

number

Defines a maximum target for simultaneous connections for an endpoint of a NEG. This is multiplied by the number of endpoints in the NEG to implicitly calculate a maximum number of target maximum simultaneous connections for the NEG. If the backend's balancingMode is CONNECTION, and the backend is attached to a backend service whose loadBalancingScheme is EXTERNAL, you must specify either this parameter, maxConnections, or maxConnectionsPerInstance.

Not available if the backend's balancingMode is RATE. Internal TCP/UDP load balancing does not support setting maxConnectionsPerEndpoint even though its backends require a balancing mode of CONNECTION.

items[].backends[].capacityScaler

number

A multiplier applied to the group's maximum servicing capacity (based on UTILIZATION, RATE or CONNECTION). Default value is 1, which means the group will serve up to 100% of its configured capacity (depending on balancingMode). A setting of 0 means the group is completely drained, offering 0% of its available Capacity. Valid range is [0.0,1.0].

This cannot be used for internal load balancing.

items[].healthChecks[]

string

The list of URLs to the HttpHealthCheck or HttpsHealthCheck resource for health checking this BackendService. Currently at most one health check can be specified, and a health check is required for Compute Engine backend services. A health check must not be specified for App Engine backend and Cloud Function backend.

For internal load balancing, a URL to a HealthCheck resource must be specified instead.

items[].timeoutSec

number

The backend service timeout has a different meaning depending on the type of load balancer. For more information read, Backend service settings The default is 30 seconds.

items[].port
(deprecated)

number

Deprecated in favor of portName. The TCP port to connect on the backend. The default value is 80.

This cannot be used if the loadBalancingScheme is INTERNAL (Internal TCP/UDP Load Balancing).

items[].protocol

enum

The protocol this BackendService uses to communicate with backends.

Possible values are HTTP, HTTPS, TCP, SSL, or UDP, depending on the chosen load balancer or Traffic Director configuration. Refer to the documentation for the load balancer or for Traffic director for more information.

items[].fingerprint

string (bytes format)

Fingerprint of this resource. A hash of the contents stored in this object. This field is used in optimistic locking. This field will be ignored when inserting a BackendService. An up-to-date fingerprint must be provided in order to update the BackendService, otherwise the request will fail with error 412 conditionNotMet.

To see the latest fingerprint, make a get() request to retrieve a BackendService.

A base64-encoded string.

items[].portName

string

A named port on a backend instance group representing the port for communication to the backend VMs in that group. Required when the loadBalancingScheme is EXTERNAL and the backends are instance groups. The named port must be defined on each backend instance group. This parameter has no meaning if the backends are NEGs.

Must be omitted when the loadBalancingScheme is INTERNAL (Internal TCP/UDP Load Blaancing).

items[].enableCDN

boolean

If true, enables Cloud CDN for the backend service. Only applicable if the loadBalancingScheme is EXTERNAL and the protocol is HTTP or HTTPS.

items[].sessionAffinity

enum

Type of session affinity to use. The default is NONE. Session affinity is not applicable if the --protocol is UDP.

When the loadBalancingScheme is EXTERNAL, possible values are NONE, CLIENT_IP, or GENERATED_COOKIE. GENERATED_COOKIE is only available if the protocol is HTTP or HTTPS.

When the loadBalancingScheme is INTERNAL, possible values are NONE, CLIENT_IP, CLIENT_IP_PROTO, or CLIENT_IP_PORT_PROTO.

When the loadBalancingScheme is INTERNAL_SELF_MANAGED, possible values are NONE, CLIENT_IP, GENERATED_COOKIE, HEADER_FIELD, or HTTP_COOKIE.

items[].affinityCookieTtlSec

number

If set to 0, the cookie is non-persistent and lasts only until the end of the browser session (or equivalent). The maximum allowed value is one day (86,400).

items[].region

string

[Output Only] URL of the region where the regional backend service resides. This field is not applicable to global backend services. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.

items[].loadBalancingScheme

enum

Indicates whether the backend service will be used with internal or external load balancing. A backend service created for one type of load balancing cannot be used with the other. Possible values are INTERNAL and EXTERNAL.

items[].connectionDraining

object

items[].connectionDraining.drainingTimeoutSec

number

The amount of time in seconds to allow existing connections to persist while on unhealthy backend VMs. Only applicable if the protocol is not UDP. The valid range is [0, 3600].

items[].iap

object

items[].iap.enabled

boolean

items[].iap.oauth2ClientId

string

items[].iap.oauth2ClientSecret

string

items[].iap.oauth2ClientSecretSha256

string

[Output Only] SHA256 hash value for the field oauth2ClientSecret above.

items[].cdnPolicy

object

Cloud CDN configuration for this BackendService.

items[].cdnPolicy.cacheKeyPolicy

object

The CacheKeyPolicy for this CdnPolicy.

items[].cdnPolicy.cacheKeyPolicy.includeProtocol

boolean

If true, http and https requests will be cached separately.

items[].cdnPolicy.cacheKeyPolicy.includeHost

boolean

If true, requests to different hosts will be cached separately.

items[].cdnPolicy.cacheKeyPolicy.includeQueryString

boolean

If true, include query string parameters in the cache key according to queryStringWhitelist and queryStringBlacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.

items[].cdnPolicy.cacheKeyPolicy.queryStringWhitelist[]

string

Names of query string parameters to include in cache keys. All other parameters will be excluded. Either specify queryStringWhitelist or queryStringBlacklist, not both. '&' and '=' will be percent encoded and not treated as delimiters.

items[].cdnPolicy.cacheKeyPolicy.queryStringBlacklist[]

string

Names of query string parameters to exclude in cache keys. All other parameters will be included. Either specify queryStringWhitelist or queryStringBlacklist, not both. '&' and '=' will be percent encoded and not treated as delimiters.

items[].cdnPolicy.signedUrlKeyNames[]

string

[Output Only] Names of the keys for signing request URLs.

items[].cdnPolicy.signedUrlCacheMaxAgeSec

string (int64 format)

Maximum number of seconds the response to a signed URL request will be considered fresh. After this time period, the response will be revalidated before being served. Defaults to 1hr (3600s). When serving responses to signed URL requests, Cloud CDN will internally behave as though all responses from this backend had a "Cache-Control: public, max-age=[TTL]" header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.

items[].customRequestHeaders[]

string

Headers that the HTTP/S load balancer should add to proxied requests.

items[].securityPolicy

string

[Output Only] The resource URL for the security policy associated with this backend service.

items[].kind

string

[Output Only] Type of resource. Always compute#backendService for backend services.

nextPageToken

string

[Output Only] This token allows you to get the next page of results for list requests. If the number of results is larger than maxResults, use the nextPageToken as a value for the query parameter pageToken in the next list request. Subsequent list requests will have their own nextPageToken to continue paging through the results.

warning

object

[Output Only] Informational warning message.

warning.code

enum

[Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE if there are no results in the response.

warning.message

string

[Output Only] A human-readable description of the warning code.

warning.data[]

object

[Output Only] Metadata about this warning in key: value format. For example:

"data": [  {  "key": "scope",  "value": "zones/us-east1-d"  }

warning.data[].key

string

[Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).

warning.data[].value

string

[Output Only] A warning data value corresponding to the key.

kind

string

[Output Only] Type of resource. Always compute#backendServiceList for lists of backend services.

Authorization Scopes

Requires one of the following OAuth scopes:

  • https://www.googleapis.com/auth/compute
  • https://www.googleapis.com/auth/cloud-platform

For more information, see the Authentication Overview.

IAM Permissions

In addition to any permissions specified on the fields above, authorization requires one or more of the following Google IAM permissions:

  • compute.regionBackendServices.list
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