> ## Documentation Index > Fetch the complete documentation index at: https://gcore.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Prefetch content > Pre-populate files to a CDN cache before users requests. Prefetch is recommended only for files that **more than 200 MB** and **less than 5 GB**. You can make one prefetch request for a CDN resource per minute. One request for prefetch may content only up to 100 paths to files. The time of procedure depends on the number and size of the files. If you need to update files stored in the CDN, first purge these files and then prefetch. ## OpenAPI ````yaml /api-reference/services_documented/cdn_api.yaml post /cdn/resources/{resource_id}/prefetch openapi: 3.1.0 info: title: Gcore OpenAPI – CDN API description: >- This OpenAPI is an aggregated OpenAPI specification that unifies all Gcore products into a single file. It covers Cloud, CDN, DNS, WAAP, DDoS Protection, Object Storage, Streaming, and FastEdge services. version: '2026-05-07T20:33:46.548242+00:00' servers: - url: https://api.gcore.com security: - APIKey: [] tags: - name: CDN service description: Information about the current state of the CDN service in your account. x-displayName: CDN service - name: CDN resources x-displayName: CDN resources - name: Origins x-displayName: Origins - name: Rules description: >- Rules allow to set up custom settings for certain file types or paths. By default, the rule inherits all options values from the related CDN resource. Each option in rule settings can be in one of the following states: - **Inherit** - Option is not added to the rule. Option inherits its value from the CDN resource settings. In this case, the option value is **null**. - **ON** - Option is added to the rule and enabled. Option values configured in the rule will override values from the CDN resource settings. - **OFF** - Option is added to the rule and disabled. Option will be turned off. x-displayName: Rules - name: Rule templates x-displayName: Rule templates - name: SSL certificates x-displayName: SSL certificates - name: Let's Encrypt certificates x-displayName: Let's Encrypt certificates - name: CA certificates x-displayName: CA certificates - name: CDN activity logs description: |- Get the history of users requests to CDN. It contains requests made both via the API and via the control panel. The following methods are not tracked in the activity logs: - HEAD - OPTIONS x-displayName: CDN activity logs - name: Log viewer description: >- Log viewer provides you with general information about CDN operation. This information does not contain all possible sets of fields and restricted by time. To receive full data, use Logs Uploader. x-displayName: Log viewer - name: Logs uploader description: >- Logs uploader allows you to upload logs with desired format to desired storages. Consists of three main parts: - **Policies** - rules that define which logs are uploaded and how they are uploaded. - **Targets** - destinations where logs are uploaded. - **Configs** - combinations of logs uploader policies, targets and resources to which they are applied. x-displayName: Logs uploader - name: Tools x-displayName: Tools - name: CDN Statistics description: >- Consumption statistics is updated in near real-time as a standard practice. However, the frequency of updates can vary, but they are typically available within a 24-hour period. Exceptions, such as maintenance periods, may delay data beyond 24 hours until servers resume and fill in the missing statistics. x-displayName: Statistics - name: Advanced analytics description: >- Advanced analytics allows to get statistics about unique visitors, traffic, and requests for countries, directories, browsers, devices, and operation systems for up to 90 days starting from today. Advanced analytics API is based on the [GraphQL framework](https://graphql.org/). Advanced analytics API has one single endpoint: https://api.gcore.com/cdn/advanced/v2/query You can pass the query parameters as a JSON object in the payload of a POST request to this endpoint. You can use curl to make requests to the Advanced analytics API. Alternatively, you can use a GraphQL client to construct queries and pass requests to the Advanced analytics API. You can write queries in GraphQL much like in SQL: specify the data set (CDN resource), the metrics to retrieve (such as unique visitors and traffic), and filter or group by dimensions (for example, a country). x-displayName: Advanced analytics - name: Origin shielding x-displayName: Origin shielding - name: IP addresses list x-displayName: IP addresses list - name: Purge history x-displayName: Purge history paths: /cdn/resources/{resource_id}/prefetch: post: tags: - Tools summary: Prefetch content description: >- Pre-populate files to a CDN cache before users requests. Prefetch is recommended only for files that **more than 200 MB** and **less than 5 GB**. You can make one prefetch request for a CDN resource per minute. One request for prefetch may content only up to 100 paths to files. The time of procedure depends on the number and size of the files. If you need to update files stored in the CDN, first purge these files and then prefetch. operationId: prefetch-content parameters: - $ref: '#/components/parameters/resource_id' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ResourcePrefetch' responses: '201': description: Successful. '400': description: Prefetch request validation is failed. content: application/json: schema: oneOf: - $ref: >- #/components/schemas/IncorrectPathsItemsPurgeOrPrefetchError - $ref: '#/components/schemas/JSONParseError' '429': description: >- You have exceeded number of allowed prefetch requests for your CDN resource. x-codeSamples: - lang: Python source: |- import os from gcore import Gcore client = Gcore( api_key=os.environ.get("GCORE_API_KEY"), # This is the default and can be omitted ) client.cdn.cdn_resources.prefetch( resource_id=0, paths=["/test.jpg", "test1.jpg"], ) - lang: Go source: "package main\n\nimport (\n\t\"context\"\n\n\t\"github.com/G-Core/gcore-go\"\n\t\"github.com/G-Core/gcore-go/cdn\"\n\t\"github.com/G-Core/gcore-go/option\"\n)\n\nfunc main() {\n\tclient := gcore.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\terr := client.CDN.CDNResources.Prefetch(\n\t\tcontext.TODO(),\n\t\t0,\n\t\tcdn.CDNResourcePrefetchParams{\n\t\t\tPaths: []string{\"/test.jpg\", \"test1.jpg\"},\n\t\t},\n\t)\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n}\n" components: parameters: resource_id: in: path name: resource_id description: CDN resource ID. required: true schema: type: integer schemas: ResourcePrefetch: type: object properties: paths: type: array description: |- Paths to files that should be pre-populated to the CDN. Paths to the files should be specified without a domain name. items: type: string example: - /test.jpg - test1.jpg required: - paths IncorrectPathsItemsPurgeOrPrefetchError: title: Incorrect paths items provided type: object properties: errors: type: object properties: paths: type: object properties: index: type: array description: Some items in "paths" is invalid. items: type: string example: - This field may not be blank. JSONParseError: title: Invalid request JSON schema type: object properties: message: type: string description: >- This message describes error if json schema from your request is invalid. example: > JSON parse error - Expecting ',' delimiter: line 3 column 33 (char 77) securitySchemes: APIKey: description: >- API key for authentication. Make sure to include the word `apikey`, followed by a single space and then your token. Example: `apikey 1234$abcdef` type: apiKey in: header name: Authorization ````