Created
January 9, 2018 23:04
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Fetch with client revalidation. On failure performs another fetch without client revalidation, so that you get cached result if available.
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| const doFetch = (url, opts = {}) => { | |
| const headers = new Headers() | |
| headers.append('Cache-Control', 'max-age=0') | |
| if (opts.headers) { | |
| for (const header of opts.headers) { | |
| headers.append(header[0], header[1]) | |
| } | |
| } | |
| return new Promise((resolve, reject) => { | |
| fetch(url, { | |
| ...opts, | |
| headers, | |
| }) | |
| .then(response => { | |
| if (response.ok) { | |
| resolve(response) | |
| } | |
| throw new Error('Network response was not ok.') | |
| }) | |
| .catch(() => { | |
| fetch(url, opts) | |
| .then(resolve) | |
| .catch(reject) | |
| }) | |
| }) | |
| } |
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