Send msgpack with ajax to flask (werkzeug) environment

msgpack data from the client side with js in a werkzeug environment I sent it as follows.

Client side

ninja.coffee

sendMsgPack:(event)=>
  event.preventDefault()
  arr = $('#hogehogeForm').serializeArray()
  data = msgpack.pack(arr)
  arrayBinary = new Uint8Array(data)
  xhr = new XMLHttpRequest()
  xhr.open('POST', '/api/url', true)
  xhr.onreadystatechange = ()->
  if xhr.readyState is 4 and xhr.status is 200
      console.log xhr.responseText
  else if xhr.readyState is 4 and xhr.status isnt 200
      console.log xhr, "hogehoge"
  xhr.setRequestHeader('Content-Type', 'application/x-msgpack; charset=x-user-defined')
  xhr.send(arrayBinary.buffer)

Server side

tasukete.py

import msgpack
from shimehari import Response, ApplicationController, request
import msgpack

class FooController(ApplicationController):
    def __init__(self, name):
        ApplicationController.__init__(self, name)

    def index(self, *args, **kwargs):
        return 'hidebu'

    def create(self, *args, **kwargs):
        #Let's really look at the header
        print msgpack.unpackb(request.data)
        return Response('aaa')

$ ({'name': 'name', 'value': 'aaaaa'},)

It seems that msgpack.js has a method called msgpack.upload. The method is PUT, or the Content-Type of the request header is ʻapplication / x-www-form-urlencoded`. I felt something immeasurable, so I used raw XMLHttpRequest for the time being. ArrayBuffer cannot be sent with jQuery.ajax, so it is useless.

When I set the Content-Type to x-www-form-urlencoded, I felt that it wasn't the case that the sent data was stored in Request.form instead of Request.data in werkzeug. I managed to do it.

At last, I decided to actually send it via WebSocket. Well, I feel that there are many situations where WebSocket cannot be used, but if you brush it up conveniently, it will be useful.

I think there are many places to go, so please let me know if you have any details.