# Cache

This function is used when data retrieved in a previous query is to be used again and does not require access to off-chain agents, allowing for fast data access.

```solidity
function getCache(
	QueryType.QueryRequest[] memory queries
) external view returns (bytes[] memory);
```

<table><thead><tr><th width="136.5">Field</th><th>Description</th></tr></thead><tbody><tr><td><code>queries</code></td><td>An array of <code>QueryRequest</code> data</td></tr></tbody></table>

Here is what the `getCache` function does;

* calculates a key from the `queries`
* get the `QueryData[]` corresponding to the key
  * `QueryData` is made to consist of `height` and `result`
* retrieve the target data from `QueryData[]`
  * If a specific `height` is specified
    * Find the matching `QueryData`
  * If `height = 0`
    * Find the `QueryData` with the largest `height`
* Insert the retrieved data into the array
* Return the data


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://futaba.gitbook.io/docs/protocol/gateway/cache.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.