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Update article.md

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Original file line number	Diff line number	Diff line change
`@@ -217,8 +217,8 @@ Normally, when a document is unloaded, all associated network requests are abort`
`217`	`217`
`218`	`218`	`It has a few limitations:`
`219`	`219`
`220`		-- We can't send megabytes: the body limit for `keepalive` requests is 64kb.
	`220`	+- We can't send megabytes: the body limit for `keepalive` requests is 64KB.
`221`	`221`	- 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.
`222`		- - 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.
	`222`	+ - 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.
`223`	`223`	- 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.
`224`	`224`	`- In most cases, such as sending out statistics, it's not a problem, as server just accepts the data and usually sends an empty response to such requests.`

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