Reference documentation and code samples for the Compute Engine v1 API enum HTTPHealthCheck.Types.PortSpecification.
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.
A value indicating that the enum field is not set.
UseFixedPort
The port number in the health check's port is used for health checking. Applies to network endpoint group and instance group backends.
UseNamedPort
Not supported.
UseServingPort
For network endpoint group backends, the health check uses the port number specified on each endpoint in the network endpoint group. For instance group backends, the health check uses the port number specified for the backend service's named port defined in the instance group's named ports.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-08 UTC."],[[["\u003cp\u003eThe latest version available for the \u003ccode\u003eHTTPHealthCheck.Types.PortSpecification\u003c/code\u003e is 3.6.0, with a range of previous versions from 1.0.0 up to 3.5.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eHTTPHealthCheck.Types.PortSpecification\u003c/code\u003e is an enum within the Compute Engine v1 API, used to specify how a port is selected for health checks.\u003c/p\u003e\n"],["\u003cp\u003eThere are four possible field values of \u003ccode\u003eHTTPHealthCheck.Types.PortSpecification\u003c/code\u003e: \u003ccode\u003eUndefinedPortSpecification\u003c/code\u003e, \u003ccode\u003eUseFixedPort\u003c/code\u003e, \u003ccode\u003eUseNamedPort\u003c/code\u003e, and \u003ccode\u003eUseServingPort\u003c/code\u003e, each with specific behaviors.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eUseFixedPort\u003c/code\u003e uses the health check's port for health checking, applicable to network endpoint groups and instance group backends, while \u003ccode\u003eUseServingPort\u003c/code\u003e utilizes the port number specified for each endpoint in the network endpoint group, or the named port for instance group backends.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eUseNamedPort\u003c/code\u003e is listed as not supported within this current version of the Compute Engine v1 API.\u003c/p\u003e\n"]]],[],null,[]]
