# stream(流) HTTP server 的request 和 process.stdout均為其發展的實例 擁有以下幾種type ``` Readable - 可讀 Writable - 可寫 Duplex - 可同時讀寫 Transform - 可轉換讀或寫的格式後再輸出 ``` 一般讀寫有兩種方式 一種是全部先讀取到buffer緩衝區，也就是電腦的記憶體，之後再一次輸出 另一種是另一種是每讀入一小塊隨即將他輸出 --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://easonwang.gitbook.io/class/stream-liu.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.