Add SetHTTP2PriorityFrames support to Client and Transport

client.go

@@ -920,6 +920,12 @@ func (c *Client) SetHTTP2HeaderPriority(priority http2.PriorityParam) *Client {
 	return c
 }
 
+// SetHTTP2PriorityFrames set the ordered http2 priority frames.
+func (c *Client) SetHTTP2PriorityFrames(frames ...http2.PriorityFrame) *Client {
+	c.Transport.SetHTTP2PriorityFrames(frames...)
+	return c
+}
+
 // SetCommonContentType set the `Content-Type` header for requests fired
 // from the client.
 func (c *Client) SetCommonContentType(ct string) *Client {

client_wrapper.go

@@ -434,6 +434,18 @@ func SetHTTP2ConnectionFlow(flow uint32) *Client {
 	return defaultClient.SetHTTP2ConnectionFlow(flow)
 }
 
+// SetHTTP2HeaderPriority is a global wrapper methods which delegated
+// to the default client's Client.SetHTTP2HeaderPriority.
+func SetHTTP2HeaderPriority(priority http2.PriorityParam) *Client {
+	return defaultClient.SetHTTP2HeaderPriority(priority)
+}
+
+// SetHTTP2PriorityFrames is a global wrapper methods which delegated
+// to the default client's Client.SetHTTP2PriorityFrames.
+func SetHTTP2PriorityFrames(frames ...http2.PriorityFrame) *Client {
+	return defaultClient.SetHTTP2PriorityFrames(frames...)
+}
+
 // SetHTTP2MaxHeaderListSize is a global wrapper methods which delegated
 // to the default client's Client.SetHTTP2MaxHeaderListSize.
 func SetHTTP2MaxHeaderListSize(max uint32) *Client {

http2/priority.go

@@ -20,3 +20,9 @@ type PriorityParam struct {
 func (p PriorityParam) IsZero() bool {
 	return p == PriorityParam{}
 }
+
+// PriorityFrame represents a http priority frame.
+type PriorityFrame struct {
+	StreamID      uint32
+	PriorityParam PriorityParam
+}

internal/http2/transport.go

@@ -136,6 +136,7 @@ type Transport struct {
 
 	ConnectionFlow uint32
 	HeaderPriority http2.PriorityParam
+	PriorityFrames []http2.PriorityFrame
 
 	connPoolOnce  sync.Once
 	connPoolOrDef ClientConnPool // non-nil version of ConnPool
@@ -703,6 +704,12 @@ func (t *Transport) newClientConn(c net.Conn, singleUse bool) (*ClientConn, erro
 		connFlow = transportDefaultConnFlow
 	}
 	cc.fr.WriteWindowUpdate(0, connFlow)
+
+	for _, p := range t.PriorityFrames {
+		cc.fr.WritePriority(p.StreamID, p.PriorityParam)
+		cc.nextStreamID = p.StreamID + 2
+	}
+
 	cc.inflow.init(int32(connFlow) + initialWindowSize)
 	cc.bw.Flush()
 	if cc.werr != nil {

transport.go

@@ -473,6 +473,12 @@ func (t *Transport) SetHTTP2HeaderPriority(priority http2.PriorityParam) *Transp
 	return t
 }
 
+// SetHTTP2PriorityFrames set the ordered http2 priority frames.
+func (t *Transport) SetHTTP2PriorityFrames(frames ...http2.PriorityFrame) *Transport {
+	t.t2.PriorityFrames = frames
+	return t
+}
+
 // SetTLSClientConfig set the custom TLSClientConfig, which specifies the TLS configuration to
 // use with tls.Client.
 // If nil, the default configuration is used.