a4a970bafa
This PR adds support of `Content-Length`, `Etag` and `X-Edge-Runtime` headers to the web server. ## Bug - [ ] Related issues linked using `fixes #number` - [x] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `yarn lint`
28 lines
768 B
TypeScript
28 lines
768 B
TypeScript
// Buffer.byteLength polyfill in the Edge runtime, with only utf8 strings
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// supported at the moment.
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export function byteLength(payload: string): number {
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return new TextEncoder().encode(payload).buffer.byteLength
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}
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// Calculate the ETag for a payload.
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export async function generateETag(payload: string) {
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if (payload.length === 0) {
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// fast-path empty
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return '"0-2jmj7l5rSw0yVb/vlWAYkK/YBwk"'
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}
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// compute hash of entity
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const hash = btoa(
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String.fromCharCode.apply(
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null,
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new Uint8Array(
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await crypto.subtle.digest('SHA-1', new TextEncoder().encode(payload))
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) as any
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)
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).substring(0, 27)
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// compute length of entity
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const len = byteLength(payload)
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return '"' + len.toString(16) + '-' + hash + '"'
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}
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