Http proxy connection can not reuse between pixiu and upstream

[mark4z]

There are two bugs on HTTP proxy. [ ] We should reuse http.Client and let user custom it in the config, like MaxIdleConnsPerHost, etc. [ ] We should close Body so that the connection can be reused. What happened: routerfiller.go

    req.Header = r.Header

        // creat http client too many times
    cli := &http3.Client{
        Transport: f.transport,
        Timeout:   hc.Timeout,
    }

    resp, err := cli.Do(req)

manger.go

func (hcm *HttpConnectionManager) buildTargetResponse(c *pch.HttpContext) {
    if c.LocalReply() {
        return
    }

    switch res := c.SourceResp.(type) {
    case *stdHttp.Response:
//It is the caller's responsibility to
    // close Body. The default HTTP client's Transport may not
    // reuse HTTP/1.x "keep-alive" TCP connections if the Body is
    // not read to completion and closed.
        body, err := io.ReadAll(res.Body)
        if err != nil {
            panic(err)
        }
        //Merge header
        remoteHeader := res.Header
        for k := range remoteHeader {
            c.AddHeader(k, remoteHeader.Get(k))
        }

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

[jokercoldly]

Please assign it to me.

[mark4z]

Please assign it to me.

as u wish