[1.经典五层模型](1.%E7%BB%8F%E5%85%B8%E4%BA%94%E5%B1%82%E6%A8%A1%E5%9E%8B.md) [2.http发展历史](2.http%E5%8F%91%E5%B1%95%E5%8E%86%E5%8F%B2.md) [3.http三次握手](3.http%E4%B8%89%E6%AC%A1%E6%8F%A1%E6%89%8B.md) [4.URI,URL,URN](4.URI,URL,URN.md) [1.http协议](1.http%E5%8D%8F%E8%AE%AE.md) [2.https](2.https.md) [http状态码](http%E7%8A%B6%E6%80%81%E7%A0%81.md)