public boolean remove(String key, String value) {
        List<String> lst = content.get(key);
        if (lst == null) {
            return false;
        }
        if (!lst.remove(value)) {
            return false;
        }
        if (lst.isEmpty()) {
            content.remove(key);
        }
        return true;
    }
<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