5034d1e7b3
Prior to this commit, the `header(String, String)` method in the ServerHttpRequest.Builder API actually added a header value instead of setting or overriding a header value. Since this conflicted with the stated behavior in the Javadoc as well as the original intention of the method, we have decided to introduce an overloaded variant `header(String, String...)` which accepts a var-args list of header values to set or override. In addition, this commit deprecates the existing `header(String, String)` method for removal in Spring Framework 5.2. In order not to be a breaking change for custom implementations of the builder API, this commit implements the new `header(String, String...)` method as an interface `default` method, with the intent to remove the default implementation in Spring Framework 5.2 closes gh-23333
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