> ## Documentation Index
> Fetch the complete documentation index at: https://help.experro.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting & Best Practices

After you’ve set up authentication and chosen the correct domain, these tips will help ensure smooth integration and optimal performance.

<Accordion title="Caching Behavior">
  Experro automatically caches responses at the edge. If you suspect stale data:

  1. **Check the `CDN-Cache` response header**
     * `HIT` → Response served from cache
     * `MISS` → Response fetched fresh from the origin

  2. **Force a cache purge**\
     In the Experro Admin Panel, navigate to **Workspace Settings → Cache**, and clear the relevant endpoint or entire cache.

  For more on caching controls, see the [Cache guide](/content/caching/cache_webpages).
</Accordion>

<Accordion title="Language Header Deprecation">
  The old `x-lang` header has been removed. Instead, specify localization per request via the `locale` **query parameter**:

  | Parameter | In    | Description                                |
  | --------- | ----- | ------------------------------------------ |
  | `locale`  | query | Language or region code for response data. |

  The relevant details are available in the API Documentation for each endpoint wherever applicable
</Accordion>

<Accordion title="GET vs POST Endpoints">
  Many Delivery APIs offer both `GET` and `POST` variants for full‑text or filtered queries. Our recommendation:

  * **Use `GET`** whenever your query parameters stay under \~1 KB in total length.
  * **Switch to `POST`** if your query string (filters, facets, etc.) exceeds \~1 KB to avoid URL length limits in browsers or proxies.
</Accordion>

<Accordion title="Token not recognized?">
  • Verify no extra spaces or line breaks were copied.\
  • Check if the token has expired in the Admin Panel.
</Accordion>

<Accordion title="Permission denied?">
  • Ensure you selected **Full Access** for write operations.\
  • For read‑only calls, confirm **Read‑Only** scope is sufficient.
</Accordion>

<Accordion title="Lost your token?">
  • Tokens cannot be retrieved once created—delete the old one and generate a new token.\
  • Update all clients to use the new token immediately.
</Accordion>

**Still stuck?** Reach out to [Support](https://www.experro.com/contact-us/) with your tenant ID and a description of the issue, and we’ll be happy to assist.