Method: healthChecks.get

Returns the specified HealthCheck resource.

HTTP request

GET https://compute.googleapis.com/compute/v1/projects/{project}/global/healthChecks/{healthCheck}

The URL uses gRPC Transcoding syntax.

Path parameters

Parameters
project

string

Project ID for this request.
healthCheck

string

Name of the HealthCheck resource to return.

Request body

The request body must be empty.

Response body

Represents a health check resource.

Google Compute Engine has two health check resources:

These health check resources can be used for load balancing and for autohealing VMs in a managed instance group (MIG).

Load balancing

Health check requirements vary depending on the type of load balancer. For details about the type of health check supported for each load balancer and corresponding backend type, see Health checks overview: Load balancer guide.

Autohealing in MIGs

The health checks that you use for autohealing VMs in a MIG can be either regional or global. For more information, see Set up an application health check and autohealing.

For more information, see Health checks overview.

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

JSON representation 
{
  "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
  }
}
Fields
kind

string

Type of the resource.
id

string (uint64 format)

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

string

[Output Only] Creation timestamp in 3339 text format.
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.
description

string

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

integer

How often (in seconds) to send a health check. The default value is 5 seconds.
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.
unhealthyThreshold

integer

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

integer

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

object
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.
tcpHealthCheck.portName

string

Not supported.
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.
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.
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
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.
sslHealthCheck

object
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.
sslHealthCheck.portName

string

Not supported.
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.
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.
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
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.
httpHealthCheck

object
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.
httpHealthCheck.portName

string

Not supported.
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.
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
httpHealthCheck.requestPath

string

The request path of the HTTP health check request. The default value is /. Must comply with RFC3986.
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.
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
httpsHealthCheck

object
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.
httpsHealthCheck.portName

string

Not supported.
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.
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
httpsHealthCheck.requestPath

string

The request path of the HTTPS health check request. The default value is /. Must comply with RFC3986.
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.
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
http2HealthCheck

object
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.
http2HealthCheck.portName

string

Not supported.
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.
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
http2HealthCheck.requestPath

string

The request path of the HTTP/2 health check request. The default value is /. Must comply with RFC3986.
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.
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
grpcHealthCheck

object
grpcHealthCheck.port

integer

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

string

Not supported.
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.
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.
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.
region

string

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

object

Configure logging on this health check.
logConfig.enable

boolean

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

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.get

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