Method: healthChecks.list

Retrieves the list of HealthCheck resources available to the specified project.

HTTP request

GET https://compute.googleapis.com/compute/beta/projects/{project}/global/healthChecks

The URL uses gRPC Transcoding syntax.

Path parameters

Parameters
project

string

Project ID for this request.

Query parameters

Parameters
maxResults

integer (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. Most Compute resources support two types of filter expressions: expressions that support regular expressions and expressions that follow API improvement proposal AIP-160. These two types of filter expressions cannot be mixed in one request.

If you want to use AIP-160, your expression must specify the field name, an operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The 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.

The :* comparison can be used to test whether a key has been defined. For example, to find all objects with owner label use:

labels.owner:*

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)

If you want to use a regular expression, use the eq (equal) or ne (not equal) operator against a single un-parenthesized expression with or without quotes or against multiple parenthesized expressions. Examples:

fieldname eq unquoted literal fieldname eq 'single quoted literal' fieldname eq "double quoted literal" (fieldname1 eq literal) (fieldname2 ne "literal")

The literal value is interpreted as a regular expression using Google RE2 library syntax. The literal value must match the entire field.

For example, to filter for instances that do not end with name "instance", you would use name ne .*instance.

You cannot combine constraints on multiple fields using regular expressions.
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.
returnPartialSuccess

boolean

Opt-in for partial success behavior which provides partial results in case of failure. The default value is false.

For example, when partial success behavior is enabled, aggregatedList for a single zone scope either returns all resources in the zone or no resources, with an error code.

Request body

The request body must be empty.

Response body

Contains a list of HealthCheck resources.

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

JSON representation 
{
  "kind": string,
  "id": string,
  "items": [
    {
      "kind": string,
      "id": string,
      "creationTimestamp": string,
      "name": string,
      "description": string,
      "checkIntervalSec": integer,
      "timeoutSec": integer,
      "unhealthyThreshold": integer,
      "healthyThreshold": integer,
      "type": enum,
      "tcpHealthCheck": {
        "port": integer,
        "portName": string,
        "portSpecification": enum,
        "request": string,
        "response": string,
        "proxyHeader": enum
      },
      "sslHealthCheck": {
        "port": integer,
        "portName": string,
        "portSpecification": enum,
        "request": string,
        "response": string,
        "proxyHeader": enum
      },
      "httpHealthCheck": {
        "port": integer,
        "portName": string,
        "portSpecification": enum,
        "host": string,
        "requestPath": string,
        "proxyHeader": enum,
        "response": string
      },
      "httpsHealthCheck": {
        "port": integer,
        "portName": string,
        "portSpecification": enum,
        "host": string,
        "requestPath": string,
        "proxyHeader": enum,
        "response": string
      },
      "http2HealthCheck": {
        "port": integer,
        "portName": string,
        "portSpecification": enum,
        "host": string,
        "requestPath": string,
        "proxyHeader": enum,
        "response": string
      },
      "grpcHealthCheck": {
        "port": integer,
        "portName": string,
        "portSpecification": enum,
        "grpcServiceName": string
      },
      "sourceRegions": [
        string
      ],
      "selfLink": string,
      "region": string,
      "logConfig": {
        "enable": boolean
      }
    }
  ],
  "nextPageToken": string,
  "selfLink": string,
  "warning": {
    "code": enum,
    "message": string,
    "data": [
      {
        "key": string,
        "value": string
      }
    ]
  }
}
Fields
kind

string

Type of resource.
id

string

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

object

A list of HealthCheck resources.
items[].kind

string

Type of the resource.
items[].id

string (uint64 format)

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

string

[Output Only] Creation timestamp in 3339 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. For example, a name that is 1-63 characters long, matches the regular expression [a-z]([-a-z0-9]*[a-z0-9])?, and otherwise complies with RFC1035. This regular expression describes a name where the first character is a lowercase letter, and all following characters are a dash, lowercase letter, or digit, except the last character, which isn't a dash.
items[].description

string

An optional description of this resource. Provide this property when you create the resource.
items[].checkIntervalSec

integer

How often (in seconds) to send a health check. The default value is 5 seconds.
items[].timeoutSec

integer

How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec to have greater value than checkIntervalSec.
items[].unhealthyThreshold

integer

A so-far healthy instance will be marked unhealthy after this many consecutive failures. The default value is 2.
items[].healthyThreshold

integer

A so-far unhealthy instance will be marked healthy after this many consecutive successes. The default value is 2.
items[].type

enum

Specifies the type of the healthCheck, either TCP, SSL, HTTP, HTTPS, HTTP2 or GRPC. Exactly one of the protocol-specific health check fields must be specified, which must match type field.
items[].tcpHealthCheck

object
items[].tcpHealthCheck.port

integer

The TCP port number to which the health check prober sends packets. The default value is 80. Valid values are 1 through 65535.
items[].tcpHealthCheck.portName

string

Not supported.
items[].tcpHealthCheck.portSpecification

enum

Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT: Specifies a port number explicitly using the port field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP network endpoint groups, GCE_VM_IP_PORT network endpoint groups, and instance group backends.
USE_NAMED_PORT: Not supported.
USE_SERVING_PORT: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT network endpoint groups and instance group backends.
For GCE_VM_IP_PORT network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
items[].tcpHealthCheck.request

string

Instructs the health check prober to send this exact ASCII string, up to 1024 bytes in length, after establishing the TCP connection.
items[].tcpHealthCheck.response

string

Creates a content-based TCP health check. In addition to establishing a TCP connection, you can configure the health check to pass only when the backend sends this exact response ASCII string, up to 1024 bytes in length. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-ssl-tcp
items[].tcpHealthCheck.proxyHeader

enum

Specifies the type of proxy header to append before sending data to the backend, either NONE or PROXY_V1. The default is NONE.
items[].sslHealthCheck

object
items[].sslHealthCheck.port

integer

The TCP port number to which the health check prober sends packets. The default value is 443. Valid values are 1 through 65535.
items[].sslHealthCheck.portName

string

Not supported.
items[].sslHealthCheck.portSpecification

enum

Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT: Specifies a port number explicitly using the port field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP network endpoint groups, GCE_VM_IP_PORT network endpoint groups, and instance group backends.
USE_NAMED_PORT: Not supported.
USE_SERVING_PORT: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT network endpoint groups and instance group backends.
For GCE_VM_IP_PORT network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
items[].sslHealthCheck.request

string

Instructs the health check prober to send this exact ASCII string, up to 1024 bytes in length, after establishing the TCP connection and SSL handshake.
items[].sslHealthCheck.response

string

Creates a content-based SSL health check. In addition to establishing a TCP connection and the TLS handshake, you can configure the health check to pass only when the backend sends this exact response ASCII string, up to 1024 bytes in length. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-ssl-tcp
items[].sslHealthCheck.proxyHeader

enum

Specifies the type of proxy header to append before sending data to the backend, either NONE or PROXY_V1. The default is NONE.
items[].httpHealthCheck

object
items[].httpHealthCheck.port

integer

The TCP port number to which the health check prober sends packets. The default value is 80. Valid values are 1 through 65535.
items[].httpHealthCheck.portName

string

Not supported.
items[].httpHealthCheck.portSpecification

enum

Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT: Specifies a port number explicitly using the port field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Also supported in legacy HTTP health checks for target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP network endpoint groups, GCE_VM_IP_PORT network endpoint groups, and instance group backends.
USE_NAMED_PORT: Not supported.
USE_SERVING_PORT: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for pass-through load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT network endpoint groups and instance group backends.
For GCE_VM_IP_PORT network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
items[].httpHealthCheck.host

string

The value of the host header in the HTTP health check request. If left empty (default value), the host header is set to the destination IP address to which health check packets are sent. The destination IP address depends on the type of load balancer. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#hc-packet-dest
items[].httpHealthCheck.requestPath

string

The request path of the HTTP health check request. The default value is /. Must comply with RFC3986.
items[].httpHealthCheck.proxyHeader

enum

Specifies the type of proxy header to append before sending data to the backend, either NONE or PROXY_V1. The default is NONE.
items[].httpHealthCheck.response

string

Creates a content-based HTTP health check. In addition to the required HTTP 200 (OK) status code, you can configure the health check to pass only when the backend sends this specific ASCII response string within the first 1024 bytes of the HTTP response body. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-http
items[].httpsHealthCheck

object
items[].httpsHealthCheck.port

integer

The TCP port number to which the health check prober sends packets. The default value is 443. Valid values are 1 through 65535.
items[].httpsHealthCheck.portName

string

Not supported.
items[].httpsHealthCheck.portSpecification

enum

Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT: Specifies a port number explicitly using the port field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP network endpoint groups, GCE_VM_IP_PORT network endpoint groups, and instance group backends.
USE_NAMED_PORT: Not supported.
USE_SERVING_PORT: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT network endpoint groups and instance group backends.
For GCE_VM_IP_PORT network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
items[].httpsHealthCheck.host

string

The value of the host header in the HTTPS health check request. If left empty (default value), the host header is set to the destination IP address to which health check packets are sent. The destination IP address depends on the type of load balancer. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#hc-packet-dest
items[].httpsHealthCheck.requestPath

string

The request path of the HTTPS health check request. The default value is /. Must comply with RFC3986.
items[].httpsHealthCheck.proxyHeader

enum

Specifies the type of proxy header to append before sending data to the backend, either NONE or PROXY_V1. The default is NONE.
items[].httpsHealthCheck.response

string

Creates a content-based HTTPS health check. In addition to the required HTTP 200 (OK) status code, you can configure the health check to pass only when the backend sends this specific ASCII response string within the first 1024 bytes of the HTTP response body. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-http
items[].http2HealthCheck

object
items[].http2HealthCheck.port

integer

The TCP port number to which the health check prober sends packets. The default value is 443. Valid values are 1 through 65535.
items[].http2HealthCheck.portName

string

Not supported.
items[].http2HealthCheck.portSpecification

enum

Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT: Specifies a port number explicitly using the port field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP network endpoint groups, GCE_VM_IP_PORT network endpoint groups, and instance group backends.
USE_NAMED_PORT: Not supported.
USE_SERVING_PORT: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT network endpoint groups and instance group backends.
For GCE_VM_IP_PORT network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
items[].http2HealthCheck.host

string

The value of the host header in the HTTP/2 health check request. If left empty (default value), the host header is set to the destination IP address to which health check packets are sent. The destination IP address depends on the type of load balancer. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#hc-packet-dest
items[].http2HealthCheck.requestPath

string

The request path of the HTTP/2 health check request. The default value is /. Must comply with RFC3986.
items[].http2HealthCheck.proxyHeader

enum

Specifies the type of proxy header to append before sending data to the backend, either NONE or PROXY_V1. The default is NONE.
items[].http2HealthCheck.response

string

Creates a content-based HTTP/2 health check. In addition to the required HTTP 200 (OK) status code, you can configure the health check to pass only when the backend sends this specific ASCII response string within the first 1024 bytes of the HTTP response body. For details, see: https://cloud.google.com/load-balancing/docs/health-check-concepts#criteria-protocol-http
items[].grpcHealthCheck

object
items[].grpcHealthCheck.port

integer

The TCP port number to which the health check prober sends packets. Valid values are 1 through 65535.
items[].grpcHealthCheck.portName

string

Not supported.
items[].grpcHealthCheck.portSpecification

enum

Specifies how a port is selected for health checking. Can be one of the following values:
USE_FIXED_PORT: Specifies a port number explicitly using the port field in the health check. Supported by backend services for passthrough load balancers and backend services for proxy load balancers. Not supported by target pools. The health check supports all backends supported by the backend service provided the backend can be health checked. For example, GCE_VM_IP network endpoint groups, GCE_VM_IP_PORT network endpoint groups, and instance group backends.
USE_NAMED_PORT: Not supported.
USE_SERVING_PORT: Provides an indirect method of specifying the health check port by referring to the backend service. Only supported by backend services for proxy load balancers. Not supported by target pools. Not supported by backend services for passthrough load balancers. Supports all backends that can be health checked; for example, GCE_VM_IP_PORT network endpoint groups and instance group backends.
For GCE_VM_IP_PORT network endpoint group backends, the health check uses the port number specified for each endpoint in the network endpoint group. For instance group backends, the health check uses the port number determined by looking up the backend service's named port in the instance group's list of named ports.
items[].grpcHealthCheck.grpcServiceName

string

The gRPC service name for the health check. This field is optional. The value of grpcServiceName has the following meanings by convention:
- Empty serviceName means the overall status of all services at the backend.
- Non-empty serviceName means the health of that gRPC service, as defined by the owner of the service.
The grpcServiceName can only be ASCII.
items[].sourceRegions[]

string

The list of cloud regions from which health checks are performed. If any regions are specified, then exactly 3 regions should be specified. The region names must be valid names of Google Cloud regions. This can only be set for global health check. If this list is non-empty, then there are restrictions on what other health check fields are supported and what other resources can use this health check:

  • SSL, HTTP2, and GRPC protocols are not supported.
  • The TCP request field is not supported.
  • The proxyHeader field for HTTP, HTTPS, and TCP is not supported.
  • The checkIntervalSec field must be at least 30.
  • The health check cannot be used with BackendService nor with managed instance group auto-healing.
items[].selfLink

string

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

string

[Output Only] Region where the health check resides. Not applicable to global health checks.
items[].logConfig

object

Configure logging on this health check.
items[].logConfig.enable

boolean

Indicates whether or not to export logs. This is false by default, which means no health check logging will be done.
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.

Authorization scopes

Requires one of the following OAuth scopes:

  • https://www.googleapis.com/auth/compute.readonly
  • 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 IAM permissions:

  • compute.healthChecks.list

To find predefined roles that contain those permissions, see Compute Engine IAM Roles.