diff --git a/vendor/golang.org/x/net/http2/transport.go b/vendor/golang.org/x/net/http2/transport.go
index f272e8f..c51a73c 100644
--- a/vendor/golang.org/x/net/http2/transport.go
+++ b/vendor/golang.org/x/net/http2/transport.go
@@ -28,6 +28,7 @@
 	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"golang.org/x/net/http/httpguts"
@@ -199,6 +200,7 @@
 	t         *Transport
 	tconn     net.Conn             // usually *tls.Conn, except specialized impls
 	tlsState  *tls.ConnectionState // nil only for specialized impls
+	reused    uint32               // whether conn is being reused; atomic
 	singleUse bool                 // whether being used for a single http.Request
 
 	// readLoop goroutine fields:
@@ -440,7 +442,8 @@
 			t.vlogf("http2: Transport failed to get client conn for %s: %v", addr, err)
 			return nil, err
 		}
-		traceGotConn(req, cc)
+		reused := !atomic.CompareAndSwapUint32(&cc.reused, 0, 1)
+		traceGotConn(req, cc, reused)
 		res, gotErrAfterReqBodyWrite, err := cc.roundTrip(req)
 		if err != nil && retry <= 6 {
 			if req, err = shouldRetryRequest(req, err, gotErrAfterReqBodyWrite); err == nil {
@@ -989,7 +992,7 @@
 		req.Method != "HEAD" {
 		// Request gzip only, not deflate. Deflate is ambiguous and
 		// not as universally supported anyway.
-		// See: http://www.gzip.org/zlib/zlib_faq.html#faq38
+		// See: https://zlib.net/zlib_faq.html#faq39
 		//
 		// Note that we don't request this for HEAD requests,
 		// due to a bug in nginx:
@@ -1213,6 +1216,8 @@
 
 	// abort request body write, but send stream reset of cancel.
 	errStopReqBodyWriteAndCancel = errors.New("http2: canceling request")
+
+	errReqBodyTooLong = errors.New("http2: request body larger than specified content length")
 )
 
 func (cs *clientStream) writeRequestBody(body io.Reader, bodyCloser io.Closer) (err error) {
@@ -1235,10 +1240,32 @@
 
 	req := cs.req
 	hasTrailers := req.Trailer != nil
+	remainLen := actualContentLength(req)
+	hasContentLen := remainLen != -1
 
 	var sawEOF bool
 	for !sawEOF {
-		n, err := body.Read(buf)
+		n, err := body.Read(buf[:len(buf)-1])
+		if hasContentLen {
+			remainLen -= int64(n)
+			if remainLen == 0 && err == nil {
+				// The request body's Content-Length was predeclared and
+				// we just finished reading it all, but the underlying io.Reader
+				// returned the final chunk with a nil error (which is one of
+				// the two valid things a Reader can do at EOF). Because we'd prefer
+				// to send the END_STREAM bit early, double-check that we're actually
+				// at EOF. Subsequent reads should return (0, EOF) at this point.
+				// If either value is different, we return an error in one of two ways below.
+				var n1 int
+				n1, err = body.Read(buf[n:])
+				remainLen -= int64(n1)
+			}
+			if remainLen < 0 {
+				err = errReqBodyTooLong
+				cc.writeStreamReset(cs.ID, ErrCodeCancel, err)
+				return err
+			}
+		}
 		if err == io.EOF {
 			sawEOF = true
 			err = nil
@@ -1411,7 +1438,11 @@
 		// followed by the query production (see Sections 3.3 and 3.4 of
 		// [RFC3986]).
 		f(":authority", host)
-		f(":method", req.Method)
+		m := req.Method
+		if m == "" {
+			m = http.MethodGet
+		}
+		f(":method", m)
 		if req.Method != "CONNECT" {
 			f(":path", path)
 			f(":scheme", req.URL.Scheme)
@@ -2555,15 +2586,15 @@
 	trace.GetConn(hostPort)
 }
 
-func traceGotConn(req *http.Request, cc *ClientConn) {
+func traceGotConn(req *http.Request, cc *ClientConn, reused bool) {
 	trace := httptrace.ContextClientTrace(req.Context())
 	if trace == nil || trace.GotConn == nil {
 		return
 	}
 	ci := httptrace.GotConnInfo{Conn: cc.tconn}
+	ci.Reused = reused
 	cc.mu.Lock()
-	ci.Reused = cc.nextStreamID > 1
-	ci.WasIdle = len(cc.streams) == 0 && ci.Reused
+	ci.WasIdle = len(cc.streams) == 0 && reused
 	if ci.WasIdle && !cc.lastActive.IsZero() {
 		ci.IdleTime = time.Now().Sub(cc.lastActive)
 	}