> ## Documentation Index > Fetch the complete documentation index at: https://docs.nylon.dev/llms.txt > Use this file to discover all available pages before exploring further. # Host a file > Copy a link into Nylon's storage, or post the bytes directly. ## OpenAPI ````yaml /openapi.yaml post /v1/media openapi: 3.1.0 info: title: Nylon API version: 1.0.0 description: | One API for publishing to seventeen social networks. You address a post to connected profile ids; Nylon knows which network each one belongs to, what that network accepts, and how to get the media there. Character limits, media specs, upload protocols and threading rules are normalised before the request reaches a platform, and every failure comes back in one error taxonomy. ## Conventions - Request and response fields are `snake_case`. - Successful responses wrap the payload in `data`. List responses add `meta.pagination`. - Failures return `{ "error": { "code", "message", "details?" } }`. Branch on `code`; `message` is written for humans and may change. - Times are ISO 8601 with a `Z` offset. - Successful responses carry `RateLimit-Limit`, `RateLimit-Remaining` and `RateLimit-Reset`. A `429` carries those plus `Retry-After`. servers: - url: https://api.nylon.dev description: Production security: - bearerAuth: [] tags: - name: Posts description: Create, schedule, inspect, edit and retry posts. - name: Profiles description: Social profiles connected to the authenticated Nylon account. - name: Connections description: Start a connection and see which networks are available. - name: Networks description: What each network accepts, as data. - name: Validation description: Dry-run a post without publishing it. - name: Webhooks description: Endpoints Nylon calls when a post finishes or a profile stops working. - name: Media description: >- Getting a file to a URL a network can fetch, when you do not already host one. paths: /v1/media: post: tags: - Media summary: Host a file description: | Gives a file a URL that Nylon hosts. Two ways to call it: **Copy a link** — send JSON with a `url`. Nylon downloads it once and stores its own copy. Worth doing whenever the original is signed, expiring or slow: a post scheduled for next week is fetched next week, not now. **Send the bytes** — send the file itself with its own `Content-Type`, up to 4 MB. Anything larger uploads straight to storage through `POST /v1/media/uploads`. The file starts `temporary` and is deleted after seven days unless a post using it publishes, at which point it is kept indefinitely. operationId: createMedia requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/IngestMediaRequest' examples: copyLink: summary: Copy a link value: url: https://s3.example.com/signed/launch.jpg image/jpeg: schema: type: string format: binary responses: '201': description: The hosted file. content: application/json: schema: $ref: '#/components/schemas/MediaResponse' '400': $ref: '#/components/responses/InvalidRequest' '401': $ref: '#/components/responses/Unauthorized' '422': description: Media hosting is not enabled on this deployment. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/InternalError' components: schemas: IngestMediaRequest: type: object required: - url properties: url: type: string format: uri description: A publicly reachable URL for Nylon to copy into its own storage. MediaResponse: type: object required: - data properties: data: $ref: '#/components/schemas/HostedMedia' ErrorResponse: type: object required: - error properties: error: $ref: '#/components/schemas/Error' HostedMedia: type: object required: - url - type - content_type - size_bytes - status properties: url: type: string format: uri description: >- The handle. Pass this to `POST /v1/posts` — there is no media id in the API. type: type: string enum: - image - video - gif content_type: type: string example: image/jpeg size_bytes: type: integer example: 482113 status: type: string enum: - temporary - permanent description: '`temporary` until a post using it publishes; then kept indefinitely.' expires_at: type: - string - 'null' format: date-time created_at: type: string format: date-time Error: type: object required: - code - message properties: code: type: string description: The stable identifier to branch on. enum: - invalid_request - unauthorized - payment_required - forbidden - not_found - conflict - rate_limited - unsupported - publish_failed - internal_error example: unauthorized message: type: string description: Written for humans. Do not match on it. example: A valid Nylon API key is required. details: type: array description: Present when the failure has a per-field or per-network breakdown. items: $ref: '#/components/schemas/ErrorDetail' ErrorDetail: type: object required: - message properties: field: type: string description: The request field the problem is about. example: profile_ids network: type: string description: The network the problem is about. example: instagram code: type: string description: | Machine-readable identifier for this problem. On a per-network detail this is a publishing code: `invalid_request`, `unsupported`, `media_error`, `reauthentication_required`, `rejected_by_network`, `network_error`, `timeout`, `profile_unavailable` or `internal_error`. example: invalid_request message: type: string example: >- Instagram requires at least 1 media item — text-only posts are not supported. responses: InvalidRequest: description: The request body or query is not valid. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: badField: value: error: code: invalid_request message: The request body is not valid. details: - field: profile_ids message: Address the post to at least one profile. Unauthorized: description: The bearer API key is missing, malformed or revoked. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: missingKey: value: error: code: unauthorized message: A valid Nylon API key is required. RateLimited: description: | Too many requests for this API key. Reads allow 120 requests a minute; publishing endpoints allow 30, because each one costs real upstream calls. The limit is per key, not per IP. headers: Retry-After: $ref: '#/components/headers/RetryAfter' RateLimit-Limit: $ref: '#/components/headers/RateLimitLimit' RateLimit-Remaining: $ref: '#/components/headers/RateLimitRemaining' RateLimit-Reset: $ref: '#/components/headers/RateLimitReset' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: throttled: value: error: code: rate_limited message: Too many requests. Retry after the window resets. InternalError: description: Nylon encountered an unexpected error. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' headers: RetryAfter: description: Seconds to wait before retrying. schema: type: integer example: 47 RateLimitLimit: description: Requests allowed in the current window. schema: type: integer example: 120 RateLimitRemaining: description: Requests left in the current window. schema: type: integer example: 119 RateLimitReset: description: Seconds until the window resets. schema: type: integer example: 47 securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: Nylon API key description: An API key beginning with `nylon_live_`. ````