.</span><span class="token function">header</span><span class="token punctuation">(</span>HEADER_NAME<span class="token punctuation">,</span> basePath<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">ServerWebExchange</span> newExchange <span class="token operator">=</span> ex