HTTP 请求 header 和 body 不在同一个包发送的问题

[panjf2000]

Actions I've taken before I'm here

• I've thoroughly read the documentations on this issue but still have no clue.
• I've searched the Github Issues but didn't find any duplicate issues that have been resolved.
• I've searched the internet for this issue but didn't find anything helpful.

What happened?

在 http demo 程序里面， c.Next(-1) 并没有拉到整个请求信息，而是只读取了 header 信息， body 信息没有读取，这样导致在 buf = buf[headerOffset+bodyLen:] ，数组越界 panic，我再次 c.Next 也拉不到更多内容， 但是在下一次 OnTraffic 回调 ，会把剩余的 body 信息读出来。 另外问一下 c.Next(-1) 需要开发者处理 TCP 的拆包和粘包问题吗？

func (hs *httpServer) OnTraffic(c gnet.Conn) gnet.Action {
    hc := c.Context().(*httpCodec)
    buf, _ := c.Next(-1)

pipeline:
    headerOffset, err := hc.parser.Parse(buf)
    if err != nil {
        c.Write(errMsgBytes)
        return gnet.Close
    }
    hc.appendResponse()
    bodyLen := int(hc.parser.ContentLength())
    if bodyLen == -1 {
        bodyLen = 0
    }
    buf = buf[headerOffset+bodyLen:]
    if len(buf) > 0 {
        goto pipeline
    }

    c.Write(hc.buf)
    hc.buf = hc.buf[:0]
    return gnet.None
}

Major version of gnet

v2

Specific version of gnet

v2.2.7

Operating system

macOS

Relevant log output

Code snippets (optional)

No response

How to Reproduce

Steps to reproduce the behavior:

1. 写个 demo 程序
2. 发送 http 请求
3. 在 OnTraffic 查看 c.Next(-1)

Does this issue reproduce with the latest release?

It can reproduce with the latest release

[panjf2000]

Transferred from panjf2000/gnet#464