4b732d62c2
Prior to this commit, gh-21783 introduced `ReadOnlyHttpHeaders` to avoid parsing media types multiple times during the lifetime of an HTTP exchange: such values are cached and the headers map is made read-only. This also added a new `HttpHeaders.writableHttpHeaders` method to unwrap the read-only variant when needed. It turns out this method sends the wrong signal to the community because: * the underlying map might be unmodifiable even if this is not an instance of ReadOnlyHttpHeaders * developers were assuming that modifying the collection that backs the read-only instance would work around the cached values for Content-Type and Accept headers This commit adds more documentation to highlight the desired behavior for cached values by the read-only variant, and deprecates the `writableHttpHeaders` method as `ReadOnlyHttpHeaders` is package private and we should not surface that concept anyway. Instead, this commit unwraps the read-only variant if needed when a new HttpHeaders instance is created. Closes gh-32116
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