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Return an instance with the provided value replacing the specified header.
While header names are case-insensitive, the casing of the header will be preserved by this function, and returned from getHeaders(). This method MUST be implemented in such a way as to retain the immutability of the message, and MUST return an instance that has the new and/or updated header and value.
$static = withHeader();
File name: wordpress-seo/vendor_prefixed/psr/http-message/src/MessageInterface.php
public function withHeader($name, $value);