This change avoids the trap of creating a copy of `HttpHeaders` using a case-sensitive `MultiValueMap` by mistake. Since mutability is always desirable, we make a mutable copy by using `addAll` on an empty `HttpHeaders`. We can't simply rely on HttpHeaders' map-based constructor to detect read-only header in this particular case, because the container's original headers representation might in some cases be read-only. Closes gh-33666 |
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