Improve: using native http request

proxy/http/http.go

@@ -0,0 +1,62 @@
+package http
+
+import (
+	"io"
+	"net"
+	"net/http"
+	"time"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type HttpAdapter struct {
+	addr *C.Addr
+	r    *http.Request
+	w    http.ResponseWriter
+	done chan struct{}
+}
+
+func (h *HttpAdapter) Close() {
+	h.done <- struct{}{}
+}
+
+func (h *HttpAdapter) Addr() *C.Addr {
+	return h.addr
+}
+
+func (h *HttpAdapter) Connect(proxy C.ProxyAdapter) {
+	req := http.Transport{
+		Dial: func(string, string) (net.Conn, error) {
+			return proxy.Conn(), nil
+		},
+		// from http.DefaultTransport
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
+	resp, err := req.RoundTrip(h.r)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	header := h.w.Header()
+	for k, vv := range resp.Header {
+		for _, v := range vv {
+			header.Add(k, v)
+		}
+	}
+	h.w.WriteHeader(resp.StatusCode)
+	io.Copy(h.w, resp.Body)
+}
+
+func NewHttp(host string, w http.ResponseWriter, r *http.Request) (*HttpAdapter, chan struct{}) {
+	done := make(chan struct{})
+	return &HttpAdapter{
+		addr: parseHttpAddr(host),
+		r:    r,
+		w:    w,
+		done: done,
+	}, done
+}