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Preventing unmodifiableList from being affected by changes to the original List #34718

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Preventing unmodifiableList from being affected by changes to the original List #34718

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4 changes: 2 additions & 2 deletions spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,7 @@ public void clearContentHeaders() {
@Override
public @Nullable List<String> get(String headerName) {
List<String> values = this.headers.get(headerName);
return (values != null ? Collections.unmodifiableList(values) : null);
return (values != null ? List.copyOf(values) : null);
}

@Override
Expand Down Expand Up @@ -179,7 +179,7 @@ public Set<Entry<String, List<String>>> headerSet() {

@Override
public void forEach(BiConsumer<? super String, ? super List<String>> action) {
this.headers.forEach((k, vs) -> action.accept(k, Collections.unmodifiableList(vs)));
this.headers.forEach((k, vs) -> action.accept(k, List.copyOf(vs)));
}

}