@Override
    public List<String> get(Object key) {
        return content.get(key);
    }
<p>Removes the given value from the entry of the specified key.</p>

@param key   The key of the entry to remove from.
@param value The value to remove from the entry.
@return True if the value was removed.
jdisc_core/src/main/java/com/yahoo/jdisc/HeaderFields.java