Method: backendBuckets.get

Returns the specified BackendBucket resource.

HTTP request

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

The URL uses gRPC Transcoding syntax.

Path parameters

Parameters
project

string

Project ID for this request.
backendBucket

string

Name of the BackendBucket resource to return.

Request body

The request body must be empty.

Response body

Represents a Cloud Storage Bucket resource.

This Cloud Storage bucket resource is referenced by a URL map of a load balancer. For more information, read Backend Buckets.

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

JSON representation 
{
  "kind": string,
  "id": string,
  "creationTimestamp": string,
  "name": string,
  "description": string,
  "selfLink": string,
  "bucketName": string,
  "enableCdn": boolean,
  "cdnPolicy": {
    "signedUrlKeyNames": [
      string
    ],
    "signedUrlCacheMaxAgeSec": string,
    "requestCoalescing": boolean,
    "cacheMode": enum,
    "defaultTtl": integer,
    "maxTtl": integer,
    "clientTtl": integer,
    "negativeCaching": boolean,
    "negativeCachingPolicy": [
      {
        "code": integer,
        "ttl": integer
      }
    ],
    "bypassCacheOnRequestHeaders": [
      {
        "headerName": string
      }
    ],
    "serveWhileStale": integer,
    "cacheKeyPolicy": {
      "queryStringWhitelist": [
        string
      ],
      "includeHttpHeaders": [
        string
      ]
    }
  },
  "customResponseHeaders": [
    string
  ],
  "edgeSecurityPolicy": string,
  "compressionMode": enum,
  "loadBalancingScheme": enum,
  "usedBy": [
    {
      "reference": string
    }
  ]
}
Fields
kind

string

Type of the resource.
id

string (uint64 format)

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

string

[Output Only] Creation timestamp in RFC3339 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. 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.
description

string

An optional textual description of the resource; provided by the client when the resource is created.
bucketName

string

Cloud Storage bucket name.
enableCdn

boolean

If true, enable Cloud CDN for this BackendBucket.
cdnPolicy

object

Cloud CDN configuration for this BackendBucket.
cdnPolicy.signedUrlKeyNames[]

string

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

boolean

If true then Cloud CDN will combine multiple concurrent cache fill requests into a small number of requests to the origin.
cdnPolicy.cacheMode

enum

Specifies the cache setting for all responses from this backend. The possible values are: USE_ORIGIN_HEADERS Requires the origin to set valid caching headers to cache content. Responses without these headers will not be cached at Google's edge, and will require a full trip to the origin on every request, potentially impacting performance and increasing load on the origin server. FORCE_CACHE_ALL Cache all content, ignoring any "private", "no-store" or "no-cache" directives in Cache-Control response headers. Warning: this may result in Cloud CDN caching private, per-user (user identifiable) content. CACHE_ALL_STATIC Automatically cache static content, including common image formats, media (video and audio), and web assets (JavaScript and CSS). Requests and responses that are marked as uncacheable, as well as dynamic content (including HTML), will not be cached.

If no value is provided for cdnPolicy.cacheMode, it defaults to CACHE_ALL_STATIC.
cdnPolicy.defaultTtl

integer

Specifies the default TTL for cached content served by this origin for responses that do not have an existing valid TTL (max-age or s-max-age). Setting a TTL of "0" means "always revalidate". The value of defaultTTL cannot be set to a value greater than that of maxTTL, but can be equal. When the cacheMode is set to FORCE_CACHE_ALL, the defaultTTL will overwrite the TTL set in all responses. The maximum allowed value is 31,622,400s (1 year), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.
cdnPolicy.maxTtl

integer

Specifies the maximum allowed TTL for cached content served by this origin. Cache directives that attempt to set a max-age or s-maxage higher than this, or an Expires header more than maxTTL seconds in the future will be capped at the value of maxTTL, as if it were the value of an s-maxage Cache-Control directive. Headers sent to the client will not be modified. Setting a TTL of "0" means "always revalidate". The maximum allowed value is 31,622,400s (1 year), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.
cdnPolicy.clientTtl

integer

Specifies a separate client (e.g. browser client) maximum TTL. This is used to clamp the max-age (or Expires) value sent to the client. With FORCE_CACHE_ALL, the lesser of clientTtl and defaultTtl is used for the response max-age directive, along with a "public" directive. For cacheable content in CACHE_ALL_STATIC mode, clientTtl clamps the max-age from the origin (if specified), or else sets the response max-age directive to the lesser of the clientTtl and defaultTtl, and also ensures a "public" cache-control directive is present. If a client TTL is not specified, a default value (1 hour) will be used. The maximum allowed value is 31,622,400s (1 year).
cdnPolicy.negativeCaching

boolean

Negative caching allows per-status code TTLs to be set, in order to apply fine-grained caching for common errors or redirects. This can reduce the load on your origin and improve end-user experience by reducing response latency. When the cache mode is set to CACHE_ALL_STATIC or USE_ORIGIN_HEADERS, negative caching applies to responses with the specified response code that lack any Cache-Control, Expires, or Pragma: no-cache directives. When the cache mode is set to FORCE_CACHE_ALL, negative caching applies to all responses with the specified response code, and override any caching headers. By default, Cloud CDN will apply the following default TTLs to these status codes: HTTP 300 (Multiple Choice), 301, 308 (Permanent Redirects): 10m HTTP 404 (Not Found), 410 (Gone), 451 (Unavailable For Legal Reasons): 120s HTTP 405 (Method Not Found), 421 (Misdirected Request), 501 (Not Implemented): 60s. These defaults can be overridden in negativeCachingPolicy.
cdnPolicy.negativeCachingPolicy[]

object

Sets a cache TTL for the specified HTTP status code. negativeCaching must be enabled to configure negativeCachingPolicy. Omitting the policy and leaving negativeCaching enabled will use Cloud CDN's default cache TTLs. Note that when specifying an explicit negativeCachingPolicy, you should take care to specify a cache TTL for all response codes that you wish to cache. Cloud CDN will not apply any default negative caching when a policy exists.
cdnPolicy.negativeCachingPolicy[].code

integer

The HTTP status code to define a TTL against. Only HTTP status codes 300, 301, 302, 307, 308, 404, 405, 410, 421, 451 and 501 are can be specified as values, and you cannot specify a status code more than once.
cdnPolicy.negativeCachingPolicy[].ttl

integer

The TTL (in seconds) for which to cache responses with the corresponding status code. The maximum allowed value is 1800s (30 minutes), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.
cdnPolicy.bypassCacheOnRequestHeaders[]

object

Bypass the cache when the specified request headers are matched - e.g. Pragma or Authorization headers. Up to 5 headers can be specified. The cache is bypassed for all cdnPolicy.cacheMode settings.
cdnPolicy.bypassCacheOnRequestHeaders[].headerName

string

The header field name to match on when bypassing cache. Values are case-insensitive.
cdnPolicy.serveWhileStale

integer

Serve existing content from the cache (if available) when revalidating content with the origin, or when an error is encountered when refreshing the cache. This setting defines the default "max-stale" duration for any cached responses that do not specify a max-stale directive. Stale responses that exceed the TTL configured here will not be served. The default limit (max-stale) is 86400s (1 day), which will allow stale content to be served up to this limit beyond the max-age (or s-max-age) of a cached response. The maximum allowed value is 604800 (1 week). Set this to zero (0) to disable serve-while-stale.
cdnPolicy.cacheKeyPolicy

object

The CacheKeyPolicy for this CdnPolicy.
cdnPolicy.cacheKeyPolicy.queryStringWhitelist[]

string

Names of query string parameters to include in cache keys. Default parameters are always included. '&' and '=' will be percent encoded and not treated as delimiters.
cdnPolicy.cacheKeyPolicy.includeHttpHeaders[]

string

Allows HTTP request headers (by name) to be used in the cache key.
customResponseHeaders[]

string

Headers that the Application Load Balancer should add to proxied responses.
edgeSecurityPolicy

string

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

enum

Compress text responses using Brotli or gzip compression, based on the client's Accept-Encoding header.
loadBalancingScheme

enum

The value can only be INTERNAL_MANAGED for cross-region internal layer 7 load balancer.

If loadBalancingScheme is not specified, the backend bucket can be used by classic global external load balancers, or global application external load balancers, or both.
usedBy[]

object

[Output Only] backendBuckets.list of resources referencing that backend bucket.
usedBy[].reference

string

[Output Only] Server-defined URL for UrlMaps referencing that BackendBucket.

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.backendBuckets.get

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