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LibWeb: Do not copy the result of HeaderList::extract_header_list_values

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There's no need to copy the Vector out of this result every time we call
it. We can move it out or access it directly.
This commit is contained in:
Timothy Flynn 2025-11-25 11:09:28 -05:00 • committed by Tim Flynn
parent 44fbf6451e
commit ed27eea091
Notes: github-actions[bot] 2025-11-26 14:16:24 +00:00
4 changed files with 45 additions and 39 deletions
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33
Libraries/LibWeb/Fetch/Fetching/Fetching.cpp
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@ -496,19 +496,20 @@ GC::Ptr<PendingResponse> main_fetch(JS::Realm& realm, Infrastructure::FetchParam
// 1. Let headerNames be the result of extracting header list values given
// `Access-Control-Expose-Headers` and response’s header list.
auto header_names_or_failure = response->header_list()->extract_header_list_values("Access-Control-Expose-Headers"sv.bytes());
auto header_names = header_names_or_failure.has<Vector<ByteBuffer>>() ? header_names_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
// 2. If request’s credentials mode is not "include" and headerNames contains `*`, then set
// response’s CORS-exposed header-name list to all unique header names in response’s header
// list.
if (request->credentials_mode() != Infrastructure::Request::CredentialsMode::Include && header_names.contains_slow("*"sv.bytes())) {
auto unique_header_names = response->header_list()->unique_names();
response->set_cors_exposed_header_name_list(move(unique_header_names));
}
// 3. Otherwise, if headerNames is not null or failure, then set response’s CORS-exposed
// header-name list to headerNames.
else if (!header_names.is_empty()) {
response->set_cors_exposed_header_name_list(move(header_names));
if (auto* header_names = header_names_or_failure.get_pointer<Vector<ByteBuffer>>()) {
// 2. If request’s credentials mode is not "include" and headerNames contains `*`, then set
// response’s CORS-exposed header-name list to all unique header names in response’s header
// list.
if (request->credentials_mode() != Infrastructure::Request::CredentialsMode::Include && header_names->contains_slow("*"sv.bytes())) {
auto unique_header_names = response->header_list()->unique_names();
response->set_cors_exposed_header_name_list(move(unique_header_names));
}
// 3. Otherwise, if headerNames is not null or failure, then set response’s CORS-exposed
// header-name list to headerNames.
else if (!header_names->is_empty()) {
response->set_cors_exposed_header_name_list(move(*header_names));
}
}
}
@ -2531,10 +2532,14 @@ GC::Ref<PendingResponse> cors_preflight_fetch(JS::Realm& realm, Infrastructure::
}
// NOTE: We treat "methods_or_failure" being `Empty` as empty Vector here.
auto methods = methods_or_failure.has<Vector<ByteBuffer>>() ? methods_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
auto methods = methods_or_failure.visit(
[](Vector<ByteBuffer>& methods) { return move(methods); },
[](auto) -> Vector<ByteBuffer> { return {}; });
// NOTE: We treat "header_names_or_failure" being `Empty` as empty Vector here.
auto header_names = header_names_or_failure.has<Vector<ByteBuffer>>() ? header_names_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
auto header_names = header_names_or_failure.visit(
[](Vector<ByteBuffer>& header_names) { return move(header_names); },
[](auto) -> Vector<ByteBuffer> { return {}; });
// 4. If methods is null and request’s use-CORS-preflight flag is set, then set methods to a new list containing request’s method.
// NOTE: This ensures that a CORS-preflight fetch that happened due to request’s use-CORS-preflight flag being set is cached.