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perf: avoid toLowerCase call #2537

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merged 1 commit into from
Dec 23, 2023
Merged

perf: avoid toLowerCase call #2537

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3 changes: 2 additions & 1 deletion lib/fetch/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2152,7 +2152,8 @@ async function httpNetworkFetch (
} else {
const keys = Object.keys(rawHeaders)
for (let i = 0; i < keys.length; ++i) {
headersList.append(keys[i], rawHeaders[keys[i]])
// The header names are already in lowercase.
headersList.append(keys[i], rawHeaders[keys[i]], true)
}
// For H2, The header names are already in lowercase,
// so we can avoid the `HeadersList#get` call here.
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2 changes: 1 addition & 1 deletion lib/fetch/request.js
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Expand Up @@ -471,7 +471,7 @@ class Request {
// 3, If Content-Type is non-null and this’s headers’s header list does
// not contain `Content-Type`, then append `Content-Type`/Content-Type to
// this’s headers.
if (contentType && !this[kHeaders][kHeadersList].contains('content-type')) {
if (contentType && !this[kHeaders][kHeadersList].contains('content-type', true)) {
this[kHeaders].append('content-type', contentType)
}
}
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