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docs: Added section describing the default response handler for fetch… #4545

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Sep 13, 2024
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docs: Added section describing the default response handler for fetch… #4545

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docs: Added section describing the default response handler for fetch…
imp-dance Aug 5, 2024
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Update docs/rtk-query/api/fetchBaseQuery.mdx
EskiMojo14 Sep 13, 2024
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11 changes: 11 additions & 0 deletions docs/rtk-query/api/fetchBaseQuery.mdx
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Expand Up @@ -297,6 +297,17 @@ export const customApi = createApi({
If you make a `json` request to an API that only returns a `200` with an undefined body, `fetchBaseQuery` will pass that through as `undefined` and will not try to parse it as `json`. This can be common with some APIs, especially on `delete` requests.
:::

#### Default response handler

The default response handler is `"json"`, which is equivalent to the following function:

```ts title="Default responseHandler"
const defaultResponseHandler = async (res: Response) => {
const text = await res.text();
return text.length ? JSON.parse(text) : null;
}
```

### Handling non-standard Response status codes

By default, `fetchBaseQuery` will `reject` any `Response` that does not have a status code of `2xx` and set it to `error`. This is the same behavior you've most likely experienced with `axios` and other popular libraries. In the event that you have a non-standard API you're dealing with, you can use the `validateStatus` option to customize this behavior.
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