> ## Documentation Index > Fetch the complete documentation index at: https://docs.langchain.com/llms.txt > Use this file to discover all available pages before exploring further. # Generate a sandbox file download link > Generate a tokenized link that downloads a single file from a sandbox with no further authentication. This mints a token rather than creating an addressable resource, so it returns 200 with no Location header. The token pins the sandbox, the file path, and the response content type and disposition, so a link cannot be repointed at another file. Links never expire unless expires_in_seconds is set. The link is served from the sandbox service domain, not the API host. ## OpenAPI ````yaml /langsmith/langsmith-platform-openapi.json post /api/v2/sandboxes/boxes/{name}/download-url openapi: 3.1.0 info: title: LangSmith description: >+ The LangSmith API is used to programmatically create and manage LangSmith resources. ## Host https://api.smith.langchain.com ## Authentication To authenticate with the LangSmith API, set the `X-Api-Key` header to a valid [LangSmith API key](https://docs.langchain.com/langsmith/create-account-api-key#create-an-api-key). version: 0.1.0 servers: - url: / security: [] tags: - name: run x-group: Tracing - name: runs x-group: Tracing - name: sessions x-group: Tracing - name: tracer-sessions x-group: Tracing - name: threads x-group: Threads - name: datasets x-group: Datasets - name: examples x-group: Datasets - name: evaluators x-group: Evaluation - name: experiment-view-overrides x-group: Evaluation - name: experiments x-group: Evaluation - name: annotation-queues x-group: Feedback & Annotation - name: annotation_queues x-group: Feedback & Annotation - name: feedback x-group: Feedback & Annotation - name: feedback-configs x-group: Feedback & Annotation - name: alert_rules x-group: Monitoring - name: bulk-exports x-group: Monitoring - name: charts x-group: Monitoring - name: commits x-group: Prompts & Playground - name: directories x-group: Prompts & Playground - name: hub_environments x-group: Prompts & Playground - name: playground-settings x-group: Prompts & Playground - name: prompt-webhooks x-group: Prompts & Playground - name: prompts x-group: Prompts & Playground - name: tag-transitions x-group: Prompts & Playground - name: comments x-group: Prompt Hub - name: likes x-group: Prompt Hub - name: optimization-jobs x-group: Prompt Hub - name: ownerships x-group: Prompt Hub - name: repos x-group: Prompt Hub - name: settings x-group: Prompt Hub - name: tags x-group: Prompt Hub - name: integrations x-group: Integrations & Tools - name: mcp x-group: Integrations & Tools - name: mcp_vendors x-group: Integrations & Tools - name: oauth x-group: Integrations & Tools - name: tools x-group: Integrations & Tools - name: gateway-policies x-group: LLM Gateway - name: sandboxes x-group: Sandboxes - name: issues x-group: Issues - name: issues-agent x-group: Issues - name: Organizations x-group: Administration - name: SCIM Tokens x-group: Administration - name: TTL Settings x-group: Administration - name: access_policies x-group: Administration - name: api-key x-group: Administration - name: audit-logs x-group: Administration - name: auth x-group: Administration - name: aws_marketplace x-group: Administration - name: data_planes x-group: Administration - name: me x-group: Administration - name: orgs x-group: Administration - name: service-accounts x-group: Administration - name: tenant x-group: Administration - name: ttl-settings x-group: Administration - name: usage-limits x-group: Administration - name: workspaces x-group: Administration - name: ace x-group: System - name: backfills x-group: System - name: features x-group: System - name: info x-group: System - name: model-price-map x-group: System - name: public x-group: System - name: fleet orgs - name: fleet secrets - name: fleet tenants - name: fleet users paths: /api/v2/sandboxes/boxes/{name}/download-url: post: tags: - sandboxes summary: Generate a sandbox file download link description: >- Generate a tokenized link that downloads a single file from a sandbox with no further authentication. This mints a token rather than creating an addressable resource, so it returns 200 with no Location header. The token pins the sandbox, the file path, and the response content type and disposition, so a link cannot be repointed at another file. Links never expire unless expires_in_seconds is set. The link is served from the sandbox service domain, not the API host. parameters: - description: Sandbox ID or name name: name in: path required: true schema: type: string requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/sandboxes.DownloadURLPayload' responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/sandboxes.DownloadURLResponse' '400': description: Bad Request content: application/json: schema: $ref: '#/components/schemas/sandboxes.ErrorResponse' '403': description: Forbidden content: application/json: schema: $ref: '#/components/schemas/sandboxes.ErrorResponse' '404': description: Not Found content: application/json: schema: $ref: '#/components/schemas/sandboxes.ErrorResponse' '500': description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/sandboxes.ErrorResponse' '501': description: Not Implemented content: application/json: schema: $ref: '#/components/schemas/sandboxes.ErrorResponse' security: - API Key: [] - Tenant ID: [] - Bearer Auth: [] components: schemas: sandboxes.DownloadURLPayload: type: object required: - path properties: content_disposition: type: string content_type: type: string expires_in_seconds: description: ExpiresInSeconds is optional; a link with no expiry never expires. type: integer path: type: string sandboxes.DownloadURLResponse: type: object required: - download_url - token properties: download_url: type: string expires_at: description: ExpiresAt is null for a link that never expires. anyOf: - type: string - type: 'null' token: type: string sandboxes.ErrorResponse: type: object properties: detail: type: object properties: error: type: string error_id: type: string message: type: string securitySchemes: API Key: type: apiKey in: header name: X-API-Key Tenant ID: type: apiKey in: header name: X-Tenant-Id Bearer Auth: type: http description: >- Bearer tokens are used to authenticate from the UI. Must also specify x-tenant-id or x-organization-id (for org scoped apis). scheme: bearer ````