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fix: correct events related terms in fetch-api article.md en #3941

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fix: correct events related terms in fetch-api article.md en #3941

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4 changes: 2 additions & 2 deletions 5-network/06-fetch-api/article.md
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Expand Up @@ -199,7 +199,7 @@ For example, we gather statistics on how the current visitor uses our page (mous

When the visitor leaves our page -- we'd like to save the data to our server.

We can use the `window.onunload` event for that:
For that we can use the `unload` event on the `window` object:

```js run
window.onunload = function() {
Expand All @@ -218,7 +218,7 @@ Normally, when a document is unloaded, all associated network requests are abort
It has a few limitations:

- We can't send megabytes: the body limit for `keepalive` requests is 64KB.
- If we need to gather a lot of statistics about the visit, we should send it out regularly in packets, so that there won't be a lot left for the last `onunload` request.
- If we need to gather a lot of statistics about the visit, we should send it out regularly in packets, so that by the time of the `unload` event there won't be much left to send.
- This limit applies to all `keepalive` requests together. In other words, we can perform multiple `keepalive` requests in parallel, but the sum of their body lengths should not exceed 64KB.
- We can't handle the server response if the document is unloaded. So in our example `fetch` will succeed due to `keepalive`, but subsequent functions won't work.
- In most cases, such as sending out statistics, it's not a problem, as the server just accepts the data and usually sends an empty response to such requests.