package nghttp2

import (
	"crypto/tls"
	"fmt"
	"golang.org/x/net/http2"
	"golang.org/x/net/http2/hpack"
	"io"
	"io/ioutil"
	"net/http"
	"regexp"
	"strings"
	"syscall"
	"testing"
	"time"
)

// TestH2H1PlainGET tests whether simple HTTP/2 GET request works.
func TestH2H1PlainGET(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1PlainGET",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	want := 200
	if res.status != want {
		t.Errorf("status = %v; want %v", res.status, want)
	}
}

// TestH2H1AddXff tests that server generates X-Forwarded-For header
// field when forwarding request to backend.
func TestH2H1AddXff(t *testing.T) {
	st := newServerTester([]string{"--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		xff := r.Header.Get("X-Forwarded-For")
		want := "127.0.0.1"
		if xff != want {
			t.Errorf("X-Forwarded-For = %v; want %v", xff, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddXff",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H1AddXff2 tests that server appends X-Forwarded-For header
// field to existing one when forwarding request to backend.
func TestH2H1AddXff2(t *testing.T) {
	st := newServerTester([]string{"--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		xff := r.Header.Get("X-Forwarded-For")
		want := "host, 127.0.0.1"
		if xff != want {
			t.Errorf("X-Forwarded-For = %v; want %v", xff, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddXff2",
		header: []hpack.HeaderField{
			pair("x-forwarded-for", "host"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H1StripXff tests that --strip-incoming-x-forwarded-for
// option.
func TestH2H1StripXff(t *testing.T) {
	st := newServerTester([]string{"--strip-incoming-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		if xff, found := r.Header["X-Forwarded-For"]; found {
			t.Errorf("X-Forwarded-For = %v; want nothing", xff)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1StripXff",
		header: []hpack.HeaderField{
			pair("x-forwarded-for", "host"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H1StripAddXff tests that --strip-incoming-x-forwarded-for and
// --add-x-forwarded-for options.
func TestH2H1StripAddXff(t *testing.T) {
	args := []string{
		"--strip-incoming-x-forwarded-for",
		"--add-x-forwarded-for",
	}
	st := newServerTester(args, t, func(w http.ResponseWriter, r *http.Request) {
		xff := r.Header.Get("X-Forwarded-For")
		want := "127.0.0.1"
		if xff != want {
			t.Errorf("X-Forwarded-For = %v; want %v", xff, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1StripAddXff",
		header: []hpack.HeaderField{
			pair("x-forwarded-for", "host"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H1AddForwardedObfuscated tests that server generates
// Forwarded header field with obfuscated "by" and "for" parameters.
func TestH2H1AddForwardedObfuscated(t *testing.T) {
	st := newServerTester([]string{"--add-forwarded=by,for,host,proto"}, t, func(w http.ResponseWriter, r *http.Request) {
		pattern := fmt.Sprintf(`by=_[^;]+;for=_[^;]+;host="127\.0\.0\.1:%v";proto=http`, serverPort)
		validFwd := regexp.MustCompile(pattern)
		got := r.Header.Get("Forwarded")

		if !validFwd.MatchString(got) {
			t.Errorf("Forwarded = %v; want pattern %v", got, pattern)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddForwardedObfuscated",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1AddForwardedByIP tests that server generates Forwarded header
// field with IP address in "by" parameter.
func TestH2H1AddForwardedByIP(t *testing.T) {
	st := newServerTester([]string{"--add-forwarded=by,for", "--forwarded-by=ip"}, t, func(w http.ResponseWriter, r *http.Request) {
		pattern := fmt.Sprintf(`by="127\.0\.0\.1:%v";for=_[^;]+`, serverPort)
		validFwd := regexp.MustCompile(pattern)
		if got := r.Header.Get("Forwarded"); !validFwd.MatchString(got) {
			t.Errorf("Forwarded = %v; want pattern %v", got, pattern)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddForwardedByIP",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1AddForwardedForIP tests that server generates Forwarded header
// field with IP address in "for" parameters.
func TestH2H1AddForwardedForIP(t *testing.T) {
	st := newServerTester([]string{"--add-forwarded=by,for,host,proto", "--forwarded-by=_alpha", "--forwarded-for=ip"}, t, func(w http.ResponseWriter, r *http.Request) {
		want := fmt.Sprintf(`by=_alpha;for=127.0.0.1;host="127.0.0.1:%v";proto=http`, serverPort)
		if got := r.Header.Get("Forwarded"); got != want {
			t.Errorf("Forwarded = %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddForwardedForIP",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1AddForwardedMerge tests that server generates Forwarded
// header field with IP address in "by" and "for" parameters.  The
// generated values must be appended to the existing value.
func TestH2H1AddForwardedMerge(t *testing.T) {
	st := newServerTester([]string{"--add-forwarded=proto"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Forwarded"), `host=foo, proto=http`; got != want {
			t.Errorf("Forwarded = %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddForwardedMerge",
		header: []hpack.HeaderField{
			pair("forwarded", "host=foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1AddForwardedStrip tests that server generates Forwarded
// header field with IP address in "by" and "for" parameters.  The
// generated values must not include the existing value.
func TestH2H1AddForwardedStrip(t *testing.T) {
	st := newServerTester([]string{"--strip-incoming-forwarded", "--add-forwarded=proto"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Forwarded"), `proto=http`; got != want {
			t.Errorf("Forwarded = %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddForwardedStrip",
		header: []hpack.HeaderField{
			pair("forwarded", "host=foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1StripForwarded tests that server strips incoming Forwarded
// header field.
func TestH2H1StripForwarded(t *testing.T) {
	st := newServerTester([]string{"--strip-incoming-forwarded"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, found := r.Header["Forwarded"]; found {
			t.Errorf("Forwarded = %v; want nothing", got)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1StripForwarded",
		header: []hpack.HeaderField{
			pair("forwarded", "host=foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1AddForwardedStatic tests that server generates Forwarded
// header field with the given static obfuscated string for "by"
// parameter.
func TestH2H1AddForwardedStatic(t *testing.T) {
	st := newServerTester([]string{"--add-forwarded=by,for", "--forwarded-by=_alpha"}, t, func(w http.ResponseWriter, r *http.Request) {
		pattern := `by=_alpha;for=_[^;]+`
		validFwd := regexp.MustCompile(pattern)
		if got := r.Header.Get("Forwarded"); !validFwd.MatchString(got) {
			t.Errorf("Forwarded = %v; want pattern %v", got, pattern)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AddForwardedStatic",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1GenerateVia tests that server generates Via header field to and
// from backend server.
func TestH2H1GenerateVia(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Via"), "2 nghttpx"; got != want {
			t.Errorf("Via: %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1GenerateVia",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.header.Get("Via"), "1.1 nghttpx"; got != want {
		t.Errorf("Via: %v; want %v", got, want)
	}
}

// TestH2H1AppendVia tests that server adds value to existing Via
// header field to and from backend server.
func TestH2H1AppendVia(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Via"), "foo, 2 nghttpx"; got != want {
			t.Errorf("Via: %v; want %v", got, want)
		}
		w.Header().Add("Via", "bar")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AppendVia",
		header: []hpack.HeaderField{
			pair("via", "foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.header.Get("Via"), "bar, 1.1 nghttpx"; got != want {
		t.Errorf("Via: %v; want %v", got, want)
	}
}

// TestH2H1NoVia tests that server does not add value to existing Via
// header field to and from backend server.
func TestH2H1NoVia(t *testing.T) {
	st := newServerTester([]string{"--no-via"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Via"), "foo"; got != want {
			t.Errorf("Via: %v; want %v", got, want)
		}
		w.Header().Add("Via", "bar")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1NoVia",
		header: []hpack.HeaderField{
			pair("via", "foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.header.Get("Via"), "bar"; got != want {
		t.Errorf("Via: %v; want %v", got, want)
	}
}

// TestH2H1HostRewrite tests that server rewrites host header field
func TestH2H1HostRewrite(t *testing.T) {
	st := newServerTester([]string{"--host-rewrite"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1HostRewrite",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := res.header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH2H1NoHostRewrite tests that server does not rewrite host
// header field
func TestH2H1NoHostRewrite(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1NoHostRewrite",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := res.header.Get("request-host"), st.frontendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH2H1BadRequestCL tests that server rejects request whose
// content-length header field value does not match its request body
// size.
func TestH2H1BadRequestCL(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	// we set content-length: 1024, but the actual request body is
	// 3 bytes.
	res, err := st.http2(requestParam{
		name:   "TestH2H1BadRequestCL",
		method: "POST",
		header: []hpack.HeaderField{
			pair("content-length", "1024"),
		},
		body: []byte("foo"),
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	want := http2.ErrCodeProtocol
	if res.errCode != want {
		t.Errorf("res.errCode = %v; want %v", res.errCode, want)
	}
}

// TestH2H1BadResponseCL tests that server returns error when
// content-length response header field value does not match its
// response body size.
func TestH2H1BadResponseCL(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		// we set content-length: 1024, but only send 3 bytes.
		w.Header().Add("Content-Length", "1024")
		w.Write([]byte("foo"))
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1BadResponseCL",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	want := http2.ErrCodeProtocol
	if res.errCode != want {
		t.Errorf("res.errCode = %v; want %v", res.errCode, want)
	}
}

// TestH2H1LocationRewrite tests location header field rewriting
// works.
func TestH2H1LocationRewrite(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		// TODO we cannot get st.ts's port number here.. 8443
		// is just a place holder.  We ignore it on rewrite.
		w.Header().Add("Location", "http://127.0.0.1:8443/p/q?a=b#fragment")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1LocationRewrite",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	want := fmt.Sprintf("http://127.0.0.1:%v/p/q?a=b#fragment", serverPort)
	if got := res.header.Get("Location"); got != want {
		t.Errorf("Location: %v; want %v", got, want)
	}
}

// TestH2H1ChunkedRequestBody tests that chunked request body works.
func TestH2H1ChunkedRequestBody(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		want := "[chunked]"
		if got := fmt.Sprint(r.TransferEncoding); got != want {
			t.Errorf("Transfer-Encoding: %v; want %v", got, want)
		}
		body, err := ioutil.ReadAll(r.Body)
		if err != nil {
			t.Fatalf("Error reading r.body: %v", err)
		}
		want = "foo"
		if got := string(body); got != want {
			t.Errorf("body: %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H1ChunkedRequestBody",
		method: "POST",
		body:   []byte("foo"),
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H1MultipleRequestCL tests that server rejects request with
// multiple Content-Length request header fields.
func TestH2H1MultipleRequestCL(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward bad request")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1MultipleRequestCL",
		header: []hpack.HeaderField{
			pair("content-length", "1"),
			pair("content-length", "1"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeProtocol; got != want {
		t.Errorf("res.errCode: %v; want %v", got, want)
	}
}

// TestH2H1InvalidRequestCL tests that server rejects request with
// Content-Length which cannot be parsed as a number.
func TestH2H1InvalidRequestCL(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward bad request")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1InvalidRequestCL",
		header: []hpack.HeaderField{
			pair("content-length", ""),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeProtocol; got != want {
		t.Errorf("res.errCode: %v; want %v", got, want)
	}
}

// // TestH2H1ConnectFailure tests that server handles the situation that
// // connection attempt to HTTP/1 backend failed.
// func TestH2H1ConnectFailure(t *testing.T) {
// 	st := newServerTester(nil, t, noopHandler)
// 	defer st.Close()

// 	// shutdown backend server to simulate backend connect failure
// 	st.ts.Close()

// 	res, err := st.http2(requestParam{
// 		name: "TestH2H1ConnectFailure",
// 	})
// 	if err != nil {
// 		t.Fatalf("Error st.http2() = %v", err)
// 	}
// 	want := 503
// 	if got := res.status; got != want {
// 		t.Errorf("status: %v; want %v", got, want)
// 	}
// }

// TestH2H1UnknownMethod tests that server can forward unknown method.
func TestH2H1UnknownMethod(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H1UnknownMethod",
		method: "get",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1BadAuthority tests that server rejects request including
// bad characters in :authority header field.
func TestH2H1BadAuthority(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward this request")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:      "TestH2H1BadAuthority",
		authority: `foo\bar`,
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeProtocol; got != want {
		t.Errorf("res.errCode: %v; want %v", got, want)
	}
}

// TestH2H1BadScheme tests that server rejects request including
// bad characters in :scheme header field.
func TestH2H1BadScheme(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward this request")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H1BadScheme",
		scheme: "http*",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeProtocol; got != want {
		t.Errorf("res.errCode: %v; want %v", got, want)
	}
}

// TestH2H1AssembleCookies tests that crumbled cookies in HTTP/2
// request is assembled into 1 when forwarding to HTTP/1 backend link.
func TestH2H1AssembleCookies(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Cookie"), "alpha; bravo; charlie"; got != want {
			t.Errorf("Cookie: %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1AssembleCookies",
		header: []hpack.HeaderField{
			pair("cookie", "alpha"),
			pair("cookie", "bravo"),
			pair("cookie", "charlie"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1TETrailers tests that server accepts TE request header
// field if it has trailers only.
func TestH2H1TETrailers(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1TETrailers",
		header: []hpack.HeaderField{
			pair("te", "trailers"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1TEGzip tests that server resets stream if TE request header
// field contains gzip.
func TestH2H1TEGzip(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Error("server should not forward bad request")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1TEGzip",
		header: []hpack.HeaderField{
			pair("te", "gzip"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeProtocol; got != want {
		t.Errorf("res.errCode = %v; want %v", res.errCode, want)
	}
}

// TestH2H1SNI tests server's TLS SNI extension feature.  It must
// choose appropriate certificate depending on the indicated
// server_name from client.
func TestH2H1SNI(t *testing.T) {
	st := newServerTesterTLSConfig([]string{"--subcert=" + testDir + "/alt-server.key:" + testDir + "/alt-server.crt"}, t, noopHandler, &tls.Config{
		ServerName: "alt-domain",
	})
	defer st.Close()

	tlsConn := st.conn.(*tls.Conn)
	connState := tlsConn.ConnectionState()
	cert := connState.PeerCertificates[0]

	if got, want := cert.Subject.CommonName, "alt-domain"; got != want {
		t.Errorf("CommonName: %v; want %v", got, want)
	}
}

// TestH2H1TLSXfp tests nghttpx sends x-forwarded-proto header field
// with http value since :scheme is http, even if the frontend
// connection is encrypted.
func TestH2H1TLSXfp(t *testing.T) {
	st := newServerTesterTLS(nil, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("x-forwarded-proto"), "http"; got != want {
			t.Errorf("x-forwarded-proto: want %v; got %v", want, got)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1TLSXfp",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1ServerPush tests server push using Link header field from
// backend server.
func TestH2H1ServerPush(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		// only resources marked as rel=preload are pushed
		if !strings.HasPrefix(r.URL.Path, "/css/") {
			w.Header().Add("Link", "</css/main.css>; rel=preload, </foo>, </css/theme.css>; rel=preload")
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1ServerPush",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
	if got, want := len(res.pushResponse), 2; got != want {
		t.Fatalf("len(res.pushResponse): %v; want %v", got, want)
	}
	mainCSS := res.pushResponse[0]
	if got, want := mainCSS.status, 200; got != want {
		t.Errorf("mainCSS.status: %v; want %v", got, want)
	}
	themeCSS := res.pushResponse[1]
	if got, want := themeCSS.status, 200; got != want {
		t.Errorf("themeCSS.status: %v; want %v", got, want)
	}
}

// TestH2H1RequestTrailer tests request trailer part is forwarded to
// backend.
func TestH2H1RequestTrailer(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		buf := make([]byte, 4096)
		for {
			_, err := r.Body.Read(buf)
			if err == io.EOF {
				break
			}
			if err != nil {
				t.Fatalf("r.Body.Read() = %v", err)
			}
		}
		if got, want := r.Trailer.Get("foo"), "bar"; got != want {
			t.Errorf("r.Trailer.Get(foo): %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1RequestTrailer",
		body: []byte("1"),
		trailer: []hpack.HeaderField{
			pair("foo", "bar"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1HeaderFieldBuffer tests that request with header fields
// larger than configured buffer size is rejected.
func TestH2H1HeaderFieldBuffer(t *testing.T) {
	st := newServerTester([]string{"--header-field-buffer=10"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatal("execution path should not be here")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1HeaderFieldBuffer",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 431; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1HeaderFields tests that request with header fields more
// than configured number is rejected.
func TestH2H1HeaderFields(t *testing.T) {
	st := newServerTester([]string{"--max-header-fields=1"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatal("execution path should not be here")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1HeaderFields",
		// we have at least 4 pseudo-header fields sent, and
		// that ensures that buffer limit exceeds.
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 431; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H1ReqPhaseSetHeader tests mruby request phase hook
// modifies request header fields.
func TestH2H1ReqPhaseSetHeader(t *testing.T) {
	st := newServerTester([]string{"--mruby-file=" + testDir + "/req-set-header.rb"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("User-Agent"), "mruby"; got != want {
			t.Errorf("User-Agent = %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1ReqPhaseSetHeader",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H1ReqPhaseReturn tests mruby request phase hook returns
// custom response.
func TestH2H1ReqPhaseReturn(t *testing.T) {
	st := newServerTester([]string{"--mruby-file=" + testDir + "/req-return.rb"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatalf("request should not be forwarded")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1ReqPhaseReturn",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 404; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}

	hdtests := []struct {
		k, v string
	}{
		{"content-length", "20"},
		{"from", "mruby"},
	}
	for _, tt := range hdtests {
		if got, want := res.header.Get(tt.k), tt.v; got != want {
			t.Errorf("%v = %v; want %v", tt.k, got, want)
		}
	}

	if got, want := string(res.body), "Hello World from req"; got != want {
		t.Errorf("body = %v; want %v", got, want)
	}
}

// TestH2H1RespPhaseSetHeader tests mruby response phase hook modifies
// response header fields.
func TestH2H1RespPhaseSetHeader(t *testing.T) {
	st := newServerTester([]string{"--mruby-file=" + testDir + "/resp-set-header.rb"}, t, noopHandler)
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1RespPhaseSetHeader",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}

	if got, want := res.header.Get("alpha"), "bravo"; got != want {
		t.Errorf("alpha = %v; want %v", got, want)
	}
}

// TestH2H1RespPhaseReturn tests mruby response phase hook returns
// custom response.
func TestH2H1RespPhaseReturn(t *testing.T) {
	st := newServerTester([]string{"--mruby-file=" + testDir + "/resp-return.rb"}, t, noopHandler)
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H1RespPhaseReturn",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 404; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}

	hdtests := []struct {
		k, v string
	}{
		{"content-length", "21"},
		{"from", "mruby"},
	}
	for _, tt := range hdtests {
		if got, want := res.header.Get(tt.k), tt.v; got != want {
			t.Errorf("%v = %v; want %v", tt.k, got, want)
		}
	}

	if got, want := string(res.body), "Hello World from resp"; got != want {
		t.Errorf("body = %v; want %v", got, want)
	}
}

// TestH2H1Upgrade tests HTTP Upgrade to HTTP/2
func TestH2H1Upgrade(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH2H1Upgrade",
		header: []hpack.HeaderField{
			pair("Connection", "Upgrade, HTTP2-Settings"),
			pair("Upgrade", "h2c"),
			pair("HTTP2-Settings", "AAMAAABkAAQAAP__"),
		},
	})

	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}

	if got, want := res.status, 101; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}

	res, err = st.http2(requestParam{
		httpUpgrade: true,
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1ProxyProtocolV1TCP4 tests PROXY protocol version 1
// containing TCP4 entry is accepted and X-Forwarded-For contains
// advertised src address.
func TestH2H1ProxyProtocolV1TCP4(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol", "--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("X-Forwarded-For"), "192.168.0.2"; got != want {
			t.Errorf("X-Forwarded-For: %v; want %v", got, want)
		}
	})
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP4 192.168.0.2 192.168.0.100 12345 8080\r\n"))

	res, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1TCP4",
	})

	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1ProxyProtocolV1TCP6 tests PROXY protocol version 1
// containing TCP6 entry is accepted and X-Forwarded-For contains
// advertised src address.
func TestH2H1ProxyProtocolV1TCP6(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol", "--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("X-Forwarded-For"), "2001:0db8:85a3:0000:0000:8a2e:0370:7334"; got != want {
			t.Errorf("X-Forwarded-For: %v; want %v", got, want)
		}
	})
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 2001:0db8:85a3:0000:0000:8a2e:0370:7334 ::1 12345 8080\r\n"))

	res, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1TCP6",
	})

	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1ProxyProtocolV1Unknown tests PROXY protocol version 1
// containing UNKNOWN entry is accepted.
func TestH2H1ProxyProtocolV1Unknown(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol", "--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, notWant := r.Header.Get("X-Forwarded-For"), "192.168.0.2"; got == notWant {
			t.Errorf("X-Forwarded-For: %v")
		}
	})
	defer st.Close()

	st.conn.Write([]byte("PROXY UNKNOWN 192.168.0.2 192.168.0.100 12345 8080\r\n"))

	res, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1Unknown",
	})

	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1ProxyProtocolV1JustUnknown tests PROXY protocol version 1
// containing only "PROXY UNKNOWN" is accepted.
func TestH2H1ProxyProtocolV1JustUnknown(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol", "--add-x-forwarded-for"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY UNKNOWN\r\n"))

	res, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1JustUnknown",
	})

	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H1ProxyProtocolV1TooLongLine tests PROXY protocol version 1
// line longer than 107 bytes must be rejected
func TestH2H1ProxyProtocolV1TooLongLine(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol", "--add-x-forwarded-for"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY UNKNOWN ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 65535 655350\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1TooLongLine",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1BadLineEnd tests that PROXY protocol version
// 1 line ending without \r\n should be rejected.
func TestH2H1ProxyProtocolV1BadLineEnd(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 12345 8080\r \n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1BadLineEnd",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1NoEnd tests that PROXY protocol version 1
// line containing no \r\n should be rejected.
func TestH2H1ProxyProtocolV1NoEnd(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 12345 8080"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1NoEnd",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1EmbeddedNULL tests that PROXY protocol
// version 1 line containing NULL character should be rejected.
func TestH2H1ProxyProtocolV1EmbeddedNULL(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	b := []byte("PROXY TCP6 ::1*foo ::1 12345 8080\r\n")
	b[14] = 0
	st.conn.Write(b)

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1EmbeddedNULL",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1MissingSrcPort tests that PROXY protocol
// version 1 line without src port should be rejected.
func TestH2H1ProxyProtocolV1MissingSrcPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1  8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1MissingSrcPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1MissingDstPort tests that PROXY protocol
// version 1 line without dst port should be rejected.
func TestH2H1ProxyProtocolV1MissingDstPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 12345 \r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1MissingDstPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1InvalidSrcPort tests that PROXY protocol
// containing invalid src port should be rejected.
func TestH2H1ProxyProtocolV1InvalidSrcPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 123x 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1InvalidSrcPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1InvalidDstPort tests that PROXY protocol
// containing invalid dst port should be rejected.
func TestH2H1ProxyProtocolV1InvalidDstPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 123456 80x\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1InvalidDstPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1LeadingZeroPort tests that PROXY protocol
// version 1 line with non zero port with leading zero should be
// rejected.
func TestH2H1ProxyProtocolV1LeadingZeroPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 03000 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1LeadingZeroPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1TooLargeSrcPort tests that PROXY protocol
// containing too large src port should be rejected.
func TestH2H1ProxyProtocolV1TooLargeSrcPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 65536 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1TooLargeSrcPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1TooLargeDstPort tests that PROXY protocol
// containing too large dst port should be rejected.
func TestH2H1ProxyProtocolV1TooLargeDstPort(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 ::1 12345 65536\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1TooLargeDstPort",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1InvalidSrcAddr tests that PROXY protocol
// containing invalid src addr should be rejected.
func TestH2H1ProxyProtocolV1InvalidSrcAddr(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 192.168.0.1 ::1 12345 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1InvalidSrcAddr",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1InvalidDstAddr tests that PROXY protocol
// containing invalid dst addr should be rejected.
func TestH2H1ProxyProtocolV1InvalidDstAddr(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY TCP6 ::1 192.168.0.1 12345 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1InvalidDstAddr",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1InvalidProtoFamily tests that PROXY protocol
// containing invalid protocol family should be rejected.
func TestH2H1ProxyProtocolV1InvalidProtoFamily(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PROXY UNIX ::1 ::1 12345 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1InvalidProtoFamily",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1ProxyProtocolV1InvalidID tests that PROXY protocol
// containing invalid PROXY protocol version 1 ID should be rejected.
func TestH2H1ProxyProtocolV1InvalidID(t *testing.T) {
	st := newServerTester([]string{"--accept-proxy-protocol"}, t, noopHandler)
	defer st.Close()

	st.conn.Write([]byte("PR0XY TCP6 ::1 ::1 12345 8080\r\n"))

	_, err := st.http2(requestParam{
		name: "TestH2H1ProxyProtocolV1InvalidID",
	})

	if err == nil {
		t.Fatalf("connection was not terminated")
	}
}

// TestH2H1GracefulShutdown tests graceful shutdown.
func TestH2H1GracefulShutdown(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	fmt.Fprint(st.conn, "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n")
	if err := st.fr.WriteSettings(); err != nil {
		t.Fatalf("st.fr.WriteSettings(): %v", err)
	}

	header := []hpack.HeaderField{
		pair(":method", "GET"),
		pair(":scheme", "http"),
		pair(":authority", st.authority),
		pair(":path", "/"),
	}

	for _, h := range header {
		_ = st.enc.WriteField(h)
	}

	if err := st.fr.WriteHeaders(http2.HeadersFrameParam{
		StreamID:      1,
		EndStream:     false,
		EndHeaders:    true,
		BlockFragment: st.headerBlkBuf.Bytes(),
	}); err != nil {
		t.Fatalf("st.fr.WriteHeaders(): %v", err)
	}

	// send SIGQUIT signal to nghttpx to perform graceful shutdown
	st.cmd.Process.Signal(syscall.SIGQUIT)
	time.Sleep(150 * time.Millisecond)

	// after signal, finish request body
	if err := st.fr.WriteData(1, true, nil); err != nil {
		t.Fatalf("st.fr.WriteData(): %v", err)
	}

	numGoAway := 0

	for {
		fr, err := st.readFrame()
		if err != nil {
			if err == io.EOF {
				want := 2
				if got := numGoAway; got != want {
					t.Fatalf("numGoAway: %v; want %v", got, want)
				}
				return
			}
			t.Fatalf("st.readFrame(): %v", err)
		}
		switch f := fr.(type) {
		case *http2.GoAwayFrame:
			numGoAway += 1
			want := http2.ErrCodeNo
			if got := f.ErrCode; got != want {
				t.Fatalf("f.ErrCode(%v): %v; want %v", numGoAway, got, want)
			}
			switch numGoAway {
			case 1:
				want := (uint32(1) << 31) - 1
				if got := f.LastStreamID; got != want {
					t.Fatalf("f.LastStreamID(%v): %v; want %v", numGoAway, got, want)
				}
			case 2:
				want := uint32(1)
				if got := f.LastStreamID; got != want {
					t.Fatalf("f.LastStreamID(%v): %v; want %v", numGoAway, got, want)
				}
			case 3:
				t.Fatalf("too many GOAWAYs received")
			}
		}
	}
}

// TestH2H2MultipleResponseCL tests that server returns error if
// multiple Content-Length response header fields are received.
func TestH2H2MultipleResponseCL(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("content-length", "1")
		w.Header().Add("content-length", "1")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2MultipleResponseCL",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeInternal; got != want {
		t.Errorf("res.errCode: %v; want %v", got, want)
	}
}

// TestH2H2InvalidResponseCL tests that server returns error if
// Content-Length response header field value cannot be parsed as a
// number.
func TestH2H2InvalidResponseCL(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("content-length", "")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2InvalidResponseCL",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.errCode, http2.ErrCodeInternal; got != want {
		t.Errorf("res.errCode: %v; want %v", got, want)
	}
}

// // TestH2H2ConnectFailure tests that server handles the situation that
// // connection attempt to HTTP/2 backend failed.
// func TestH2H2ConnectFailure(t *testing.T) {
// 	st := newServerTester([]string{"--http2-bridge"}, t, noopHandler)
// 	defer st.Close()

// 	// simulate backend connect attempt failure
// 	st.ts.Close()

// 	res, err := st.http2(requestParam{
// 		name: "TestH2H2ConnectFailure",
// 	})
// 	if err != nil {
// 		t.Fatalf("Error st.http2() = %v", err)
// 	}
// 	want := 503
// 	if got := res.status; got != want {
// 		t.Errorf("status: %v; want %v", got, want)
// 	}
// }

// TestH2H2HostRewrite tests that server rewrites host header field
func TestH2H2HostRewrite(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge", "--host-rewrite"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2HostRewrite",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := res.header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH2H2NoHostRewrite tests that server does not rewrite host
// header field
func TestH2H2NoHostRewrite(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2NoHostRewrite",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := res.header.Get("request-host"), st.frontendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH2H2TLSXfp tests nghttpx sends x-forwarded-proto header field
// with http value since :scheme is http, even if the frontend
// connection is encrypted.
func TestH2H2TLSXfp(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("x-forwarded-proto"), "http"; got != want {
			t.Errorf("x-forwarded-proto: want %v; got %v", want, got)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2TLSXfp",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH2H2AddXff tests that server generates X-Forwarded-For header
// field when forwarding request to backend.
func TestH2H2AddXff(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		xff := r.Header.Get("X-Forwarded-For")
		want := "127.0.0.1"
		if xff != want {
			t.Errorf("X-Forwarded-For = %v; want %v", xff, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2AddXff",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H2AddXff2 tests that server appends X-Forwarded-For header
// field to existing one when forwarding request to backend.
func TestH2H2AddXff2(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		xff := r.Header.Get("X-Forwarded-For")
		want := "host, 127.0.0.1"
		if xff != want {
			t.Errorf("X-Forwarded-For = %v; want %v", xff, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2AddXff2",
		header: []hpack.HeaderField{
			pair("x-forwarded-for", "host"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H2StripXff tests that --strip-incoming-x-forwarded-for
// option.
func TestH2H2StripXff(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--strip-incoming-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		if xff, found := r.Header["X-Forwarded-For"]; found {
			t.Errorf("X-Forwarded-For = %v; want nothing", xff)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2StripXff",
		header: []hpack.HeaderField{
			pair("x-forwarded-for", "host"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H2StripAddXff tests that --strip-incoming-x-forwarded-for and
// --add-x-forwarded-for options.
func TestH2H2StripAddXff(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--strip-incoming-x-forwarded-for", "--add-x-forwarded-for"}, t, func(w http.ResponseWriter, r *http.Request) {
		xff := r.Header.Get("X-Forwarded-For")
		want := "127.0.0.1"
		if xff != want {
			t.Errorf("X-Forwarded-For = %v; want %v", xff, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2StripAddXff",
		header: []hpack.HeaderField{
			pair("x-forwarded-for", "host"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH2H2AddForwarded tests that server generates Forwarded header
// field using static obfuscated "by" parameter.
func TestH2H2AddForwarded(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--add-forwarded=by,for,host,proto", "--forwarded-by=_alpha"}, t, func(w http.ResponseWriter, r *http.Request) {
		pattern := fmt.Sprintf(`by=_alpha;for=_[^;]+;host="127\.0\.0\.1:%v";proto=https`, serverPort)
		validFwd := regexp.MustCompile(pattern)
		if got := r.Header.Get("Forwarded"); !validFwd.MatchString(got) {
			t.Errorf("Forwarded = %v; want pattern %v", got, pattern)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H2AddForwarded",
		scheme: "https",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H2AddForwardedMerge tests that server generates Forwarded
// header field using static obfuscated "by" parameter, and
// existing Forwarded header field.
func TestH2H2AddForwardedMerge(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--add-forwarded=by,host,proto", "--forwarded-by=_alpha"}, t, func(w http.ResponseWriter, r *http.Request) {
		want := fmt.Sprintf(`host=foo, by=_alpha;host="127.0.0.1:%v";proto=https`, serverPort)
		if got := r.Header.Get("Forwarded"); got != want {
			t.Errorf("Forwarded = %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H2AddForwardedMerge",
		scheme: "https",
		header: []hpack.HeaderField{
			pair("forwarded", "host=foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H2AddForwardedStrip tests that server generates Forwarded
// header field using static obfuscated "by" parameter, and
// existing Forwarded header field stripped.
func TestH2H2AddForwardedStrip(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--strip-incoming-forwarded", "--add-forwarded=by,host,proto", "--forwarded-by=_alpha"}, t, func(w http.ResponseWriter, r *http.Request) {
		want := fmt.Sprintf(`by=_alpha;host="127.0.0.1:%v";proto=https`, serverPort)
		if got := r.Header.Get("Forwarded"); got != want {
			t.Errorf("Forwarded = %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H2AddForwardedStrip",
		scheme: "https",
		header: []hpack.HeaderField{
			pair("forwarded", "host=foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H2StripForwarded tests that server strips incoming Forwarded
// header field.
func TestH2H2StripForwarded(t *testing.T) {
	st := newServerTesterTLS([]string{"--http2-bridge", "--strip-incoming-forwarded"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, found := r.Header["Forwarded"]; found {
			t.Errorf("Forwarded = %v; want nothing", got)
		}
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name:   "TestH2H2StripForwarded",
		scheme: "https",
		header: []hpack.HeaderField{
			pair("forwarded", "host=foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH2H2ReqPhaseReturn tests mruby request phase hook returns
// custom response.
func TestH2H2ReqPhaseReturn(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge", "--mruby-file=" + testDir + "/req-return.rb"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatalf("request should not be forwarded")
	})
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2ReqPhaseReturn",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 404; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}

	hdtests := []struct {
		k, v string
	}{
		{"content-length", "20"},
		{"from", "mruby"},
	}
	for _, tt := range hdtests {
		if got, want := res.header.Get(tt.k), tt.v; got != want {
			t.Errorf("%v = %v; want %v", tt.k, got, want)
		}
	}

	if got, want := string(res.body), "Hello World from req"; got != want {
		t.Errorf("body = %v; want %v", got, want)
	}
}

// TestH2H2RespPhaseReturn tests mruby response phase hook returns
// custom response.
func TestH2H2RespPhaseReturn(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge", "--mruby-file=" + testDir + "/resp-return.rb"}, t, noopHandler)
	defer st.Close()

	res, err := st.http2(requestParam{
		name: "TestH2H2RespPhaseReturn",
	})
	if err != nil {
		t.Fatalf("Error st.http2() = %v", err)
	}

	if got, want := res.status, 404; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}

	hdtests := []struct {
		k, v string
	}{
		{"content-length", "21"},
		{"from", "mruby"},
	}
	for _, tt := range hdtests {
		if got, want := res.header.Get(tt.k), tt.v; got != want {
			t.Errorf("%v = %v; want %v", tt.k, got, want)
		}
	}

	if got, want := string(res.body), "Hello World from resp"; got != want {
		t.Errorf("body = %v; want %v", got, want)
	}
}