"io"
	"net"
	"net/http"
	"net/http/httptest"
	"sync"
	"testing"
	"time"

	"golang.org/x/net/http2"
)

var (
	// startServerShutdown is a signal from the backend after receiving all (25) requests
	// after which the test shuts down the HTTP server
	startServerShutdown = make(chan struct{})

	// handlerLock used in the backendHTTPHandler to count the number of requests and signal the test that the termination can start