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Raphael Tholl 2021-01-02 18:54:05 +01:00 • committed by GitHub
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5-network/06-fetch-api/article.md
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@ -158,7 +158,7 @@ The `cache` options allows to ignore HTTP-cache or fine-tune its usage:
- **`"default"`** -- `fetch` uses standard HTTP-cache rules and headers,
- **`"no-store"`** -- totally ignore HTTP-cache, this mode becomes the default if we set a header `If-Modified-Since`, `If-None-Match`, `If-Unmodified-Since`, `If-Match`, or `If-Range`,
- **`"reload"`** -- don't take the result from HTTP-cache (if any), but populate the cache with the response (if response headers are allowed),
- **`"reload"`** -- don't take the result from HTTP-cache (if any), but populate the cache with the response (if the response headers permit this action),
- **`"no-cache"`** -- create a conditional request if there is a cached response, and a normal request otherwise. Populate HTTP-cache with the response,
- **`"force-cache"`** -- use a response from HTTP-cache, even if it's stale. If there's no response in HTTP-cache, make a regular HTTP-request, behave normally,
- **`"only-if-cached"`** -- use a response from HTTP-cache, even if it's stale. If there's no response in HTTP-cache, then error. Only works when `mode` is `"same-origin"`.
@ -219,6 +219,6 @@ 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.
- This limit applies to all `keepalive` requests. In other words, we can perform multiple `keepalive` requests in parallel, but the sum of their body lengths should not exceed 64KB.
- 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.