> + */
> +@Singleton
> +public class BindAccountMetadataToDeleteToHeaders implements Binder {
> +   
> +   private final Function<String, String> transformHeaders;
> +   private final Function<String, String> transformValues;
> +   
> +   public BindAccountMetadataToDeleteToHeaders() {
> +        
> +        transformHeaders = new Function<String, String>() {
> +
> +         @Override
> +         public String apply(String element) {
> +            String inLowercase = element.toLowerCase();
> +            return (!inLowercase.startsWith(ACCOUNT_METADATA_PREFIX)) 
> +                     ? ACCOUNT_METADATA_PREFIX.toLowerCase() + inLowercase : 
> inLowercase;

If `ACCOUNT_METADATA_PREFIX` isn't in lowercase already, declare a local 
constant or variable which represents it and use that here?

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