public AbstractHttpFileBuilder cacheControl(CharSequence cacheControl) {
        requireNonNull(cacheControl, "cacheControl");
        return setHeader(HttpHeaderNames.CACHE_CONTROL, cacheControl);
    }
Sets the {@code "cache-control"} header. This method is a shortcut for:
<pre>{@code
builder.setHeader(HttpHeaderNames.CACHE_CONTROL, cacheControl);
}</pre>
core/src/main/java/com/linecorp/armeria/server/file/AbstractHttpFileBuilder.java