5a11569790
Prior to this commit, `ServerHttpRequest.mutate()` would not reflect changes made on the "Accept" and "Content-Type" HTTP headers. This was due to the fact that the instantiation of a new request based on the mutated values would not use the writable HTTP headers used during the mutation, but rather a read-only view of the headers backed by `ReadOnlyHttpHeaders`. `ReadOnlyHttpHeaders` caches those values for performance reasons, so getting those from the new request would not reflect the changes made during the mutation phase. This commit ensures that the new request uses the mutated headers. Fixes gh-26615
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