Binary data not supported

[pengsrc]

Hi，I was using the example from (https://github.com/cloudevents/sdk-javascript/blob/master/examples/express-ex) and got this error.

{ message: 'content type not allowed',
  errors: [ 'application/octet-stream' ] } 

[pengsrc]

https://www.iana.org/assignments/media-types/application/octet-stream

The "octet-stream" subtype is used to indicate that a body contains
arbitrary binary data.

[pengsrc]

Code to send the CloudEvent message.

package cloudevents_test

import (
	"context"
	"testing"
	"time"

	"github.com/cloudevents/sdk-go"
	"github.com/cloudevents/sdk-go/pkg/cloudevents/client"
	cehttp "github.com/cloudevents/sdk-go/pkg/cloudevents/transport/http"
	"github.com/cloudevents/sdk-go/pkg/cloudevents/types"
	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
)

func TestTransportHTTP(t *testing.T) {
	encodeType := "application/octet-stream"
	event := cloudevents.Event{
		Context: cloudevents.EventContextV02{
			ID:          uuid.New().String(),
			Type:        "example",
			Source:      *types.ParseURLRef("/test"),
			Time:        &types.Timestamp{Time: time.Now()},
			ContentType: &encodeType,
			Extensions:  map[string]interface{}{"a": 1, "b": 2, "c": 3},
		}.AsV02(),
		Data:        []byte("Hello text."),
		DataEncoded: true,
	}

	c, err := newEventClient("http://127.0.0.1:3000")
	assert.NoError(t, err)

	resp, err := c.Send(context.Background(), event)
	assert.NoError(t, err)
	t.Log(resp)
}

func newEventClient(target string) (client.Client, error) {
	t, err := cehttp.New([]cehttp.Option{
		cehttp.WithBinaryEncoding(), cehttp.WithTarget(target),
	}...)
	if err != nil {
		return nil, err
	}
	c, err := client.New(t, client.WithUUIDs(), client.WithTimeNow())
	if err != nil {
		return nil, err
	}
	return c, nil
}

[fabiojose]

@pengsrc,
Nice PR!

[fabiojose]

@pengsrc
Released: https://www.npmjs.com/package/cloudevents-sdk/v/0.2.6