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fetch: don't re-lowercase HeadersList #3159

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Apr 24, 2024
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fetch: don't re-lowercase HeadersList #3159

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5 changes: 3 additions & 2 deletions lib/web/fetch/request.js
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Original file line number Diff line number Diff line change
Expand Up @@ -459,8 +459,9 @@ class Request {
// 4. If headers is a Headers object, then for each header in its header
// list, append header’s name/header’s value to this’s headers.
if (headers instanceof HeadersList) {
for (const [key, val] of headers) {
headersList.append(key, val)
for (const { 0: key, 1: val } of headers) {
// Note: The header names are already in lowercase.
headersList.append(key, val, true)
}
// Note: Copy the `set-cookie` meta-data.
headersList.cookies = headers.cookies
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