fix(http): honor configured request header deadlines

Signed-off-by: Feng Ruohang <rh@vonng.com>
(cherry picked from commit 0d48d32d7e038ae1ea5966f3d7e0cb86780a6311)
Signed-off-by: Feng Ruohang <rh@vonng.com>

docs/investigations/r8/evidence/baseline_test.go.txt

@@ -0,0 +1,63 @@
+package http
+
+import (
+	"bufio"
+	"context"
+	"io"
+	"net"
+	stdhttp "net/http"
+	"testing"
+	"time"
+)
+
+func TestReviewR8AbsoluteHeaderTimeout(t *testing.T) {
+	for _, wrapped := range []bool{false, true} {
+		name := "standard-net-http"
+		if wrapped {
+			name = "silo-listener"
+		}
+		t.Run(name, func(t *testing.T) {
+			handler := stdhttp.HandlerFunc(func(w stdhttp.ResponseWriter, r *stdhttp.Request) { w.WriteHeader(204) })
+			var addr string
+			if wrapped {
+				srv := NewServer([]string{"127.0.0.1:0"}).UseHandler(handler).
+					UseTCPOptions(TCPOptions{IdleTimeout: 2 * time.Second}).
+					UseReadHeaderTimeout(100 * time.Millisecond).UseReadTimeout(2 * time.Second).UseWriteTimeout(2 * time.Second)
+				serve, err := srv.Init(context.Background(), func(_ string, err error) { t.Error(err) })
+				if err != nil {
+					t.Fatal(err)
+				}
+				addr = srv.listener.Addr().String()
+				go serve()
+				defer srv.Server.Close()
+			} else {
+				ln, err := net.Listen("tcp", "127.0.0.1:0")
+				if err != nil {
+					t.Fatal(err)
+				}
+				srv := &stdhttp.Server{Handler: handler, ReadHeaderTimeout: 100 * time.Millisecond, ReadTimeout: 2 * time.Second, WriteTimeout: 2 * time.Second}
+				addr = ln.Addr().String()
+				go srv.Serve(ln)
+				defer srv.Close()
+			}
+			conn, err := net.DialTimeout("tcp", addr, time.Second)
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer conn.Close()
+			conn.SetDeadline(time.Now().Add(3 * time.Second))
+			if _, err := io.WriteString(conn, "GET / HTTP/1.1\r\nHost: localhost\r\nX-Slow: "); err != nil {
+				t.Fatal(err)
+			}
+			time.Sleep(400 * time.Millisecond)
+			io.WriteString(conn, "done\r\nConnection: close\r\n\r\n")
+			resp, err := stdhttp.ReadResponse(bufio.NewReader(conn), nil)
+			if err != nil {
+				t.Logf("request rejected after header timeout: %v", err)
+				return
+			}
+			defer resp.Body.Close()
+			t.Errorf("100ms request-header deadline accepted header completed after 400ms: HTTP %d", resp.StatusCode)
+		})
+	}
+}