Re: [whatwg/fetch] Add "only-if-cached" cache mode back (#295)

> @@ -3029,9 +3036,18 @@ <h4 id="should-response-to-request-be-blocked-due-to-nosniff?"><dfn title="shoul
>   <span title=concept-header>headers</span>.
>   <!-- XXX xref partial, modify, resume headers -->
>  
> - <li><p>If <var>response</var> is null, set <var>response</var> to the result of making an
> - <span title=concept-http-network-fetch>HTTP-network fetch</span> using <var>httpRequest</var> with
> - the <i title>credentials flag</i> set if set.
> + <li>
> +  <p>If <var>response</var> is null, run these substeps:
> +
> +  <ol>
> +   <li><p>If <var>httpRequest</var>'s <span title=concept-request-cache-mode>cache mode</span> is
> +   "<code title>only-if-cached</code>", then return a
> +   <span title=concept-network-error>network error</span>.

The difference would be that it would not surface as a rejection in the API meaning you'd have to inspect the response status code to know what's going on (which could theoretically be the same).

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