Merge pull request bnb-chain#140 from constwz/perf-httpclient

perf: add DialOptions function for Dial

ethclient/ethclient.go

@@ -50,6 +50,16 @@ func DialContext(ctx context.Context, rawurl string) (*Client, error) {
 	return NewClient(c), nil
 }
 
+// DialOptions creates a new RPC client for the given URL. You can supply any of the
+// pre-defined client options to configure the underlying transport.
+func DialOptions(ctx context.Context, rawurl string, opts ...rpc.ClientOption) (*Client, error) {
+	c, err := rpc.DialOptions(ctx, rawurl, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return NewClient(c), nil
+}
+
 // NewClient creates a client that uses the given RPC client.
 func NewClient(c *rpc.Client) *Client {
 	return &Client{c}