@Override
    public RequestOptionsBuilder writeTimeoutMillis(long writeTimeoutMillis) {
        checkArgument(writeTimeoutMillis >= 0, "writeTimeoutMillis: %s (expected: >= 0)",
                      writeTimeoutMillis);
        this.writeTimeoutMillis = writeTimeoutMillis;
        return this;
    }
A builder for creating a new {@link RequestOptions}.
core/src/main/java/com/linecorp/armeria/client/RequestOptionsBuilder.java