@Nullable
    private static Long toTimeMillis(@Nullable String v) {
        if (v == null) {
            return null;
        }

        try {
            @SuppressWarnings("UseOfObsoleteDateTimeApi")
            final Date date = DateFormatter.parseHttpDate(v);
            return date != null ? date.getTime() : null;
        } catch (Exception ignore) {
            // `parseHttpDate()` can raise an exception rather than returning `null`
            // when the given value has more than 64 characters.
            return null;
        }
    }
Removes all the entries whose hash code equals {@code h} and whose name is equal to {@code name}.

@return the first value inserted, or {@code null} if there is no such entry.
core/src/main/java/com/linecorp/armeria/common/StringMultimap.java