# Additional Assets

Source: https://zshot-cli.com/reference/server/additional-assets/
Markdown: https://zshot-cli.com/reference/server/additional-assets/index.md
Section: [Reference](https://zshot-cli.com/reference/) › [Server](https://zshot-cli.com/reference/server/)

A render returns its primary output as the response body. It can also produce additional artifacts.
Request each with its matching `with_*` field: `with_har`, `with_warc`, `with_archive_cdx`,
`with_pprof_cpu`, `with_pprof_memory`, `with_trace`, `with_navigator_video`, `with_network_log`,
and `with_axtree`. Most are booleans; `with_axtree` instead takes `true`/`json` for the JSON
accessibility tree or `text` for the indented snapshot. `with_archive_cdx` produces a CDXJ index
of the WARC and requires one: `output_type=warc` or `with_warc=true`.

## The `Link` header

Each asset the server produces is written to a temporary location and advertised with a `Link`
header on the render response, one per asset:

```
Link: </assets?file=<id>.har>; rel="related"; type="application/json"
```

The URL is relative, so it resolves against whatever host or reverse proxy fronts the server. Fetch
the asset with a GET to that URL. Its lifetime is set by
[`--server-additional-asset-expiration`](/reference/flags/server/server-additional-asset-expiration);
after it expires the URL returns 404. A lifetime of `0` turns additional assets off: the server
writes none and sends no `Link` headers.

When the server requires [signed URLs](/reference/server/authentication#signed-urls), each asset
link is signed and its `expires` is the asset's lifetime, capped by
[`--server-signed-url-max-age`](/reference/flags/server/server-signed-url-max-age).

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