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 Google API HTTP annotation 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:

Contains a list of BackendService resources.

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,
          "maxConnections": number,
          "maxConnectionsPerInstance": 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
      },
      "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 a Instance Group resource. This instance group defines the list of instances that serve traffic. Member virtual machine instances from each instance group must live in the same zone as the instance group itself. No two backends in a backend service are allowed to use same Instance Group resource.

Note that you must specify an Instance Group resource using the fully-qualified URL, rather than a partial URL.

When the BackendService has load balancing scheme INTERNAL, the instance group must be within the same region as the BackendService.

items[].backends[].balancingMode

enum

Specifies the balancing mode for this backend. For global HTTP(S) or TCP/SSL load balancing, the default is UTILIZATION. Valid values are UTILIZATION, RATE (for HTTP(S)) and CONNECTION (for TCP/SSL).

For Internal Load Balancing, the default and only supported mode is CONNECTION.

items[].backends[].maxUtilization

number

Used when balancingMode is UTILIZATION. This ratio defines the CPU utilization target for the group. The default is 0.8. Valid range is [0.0, 1.0].

This cannot be used for internal load balancing.

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

The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.

This cannot be used for internal load balancing.

items[].backends[].maxConnections

number

The max number of simultaneous connections for the group. Can be used with either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.

This cannot be used for internal load balancing.

items[].backends[].maxConnectionsPerInstance

number

The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.

This cannot be used for internal load balancing.

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

How many seconds to wait for the backend before considering it a failed request. 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 for internal load balancing.

items[].protocol

enum

The protocol this BackendService uses to communicate with backends.

Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.

For internal load balancing, the possible values are TCP and UDP, and the default is TCP.

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.

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

A base64-encoded string.

items[].portName

string

Name of backend port. The same name should appear in the instance groups referenced by this service. Required when the load balancing scheme is EXTERNAL.

When the load balancing scheme is INTERNAL, this field is not used.

items[].enableCDN

boolean

If true, enable Cloud CDN for this BackendService.

When the load balancing scheme is INTERNAL, this field is not used.

items[].sessionAffinity

enum

Type of session affinity to use. The default is NONE.

When the load balancing scheme is EXTERNAL, can be NONE, CLIENT_IP, or GENERATED_COOKIE.

When the load balancing scheme is INTERNAL, can be NONE, CLIENT_IP, CLIENT_IP_PROTO, or CLIENT_IP_PORT_PROTO.

When the protocol is UDP, this field is not used.

items[].affinityCookieTtlSec

number

Lifetime of cookies in seconds if sessionAffinity is GENERATED_COOKIE. 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 for TTL is one day.

When the load balancing scheme is INTERNAL, this field is not used.

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

Time for which instance will be drained (not accept new connections, but still work to finish started).

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[].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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