MicroPython urequests.post failures - http-post

Question

I'm trying to receive notifications on my (Android) mobile device from an ESP8266 MCU running MicroPython. For this reason I subscribed to a couple of online services exposing some APIs for this task, Pushbullet, and Pushed, and I installed the matching apps on my device.
This is what I'm trying:
Pushbullet:
import json
import urequests
body = "Test Notification"
title = "Pushbullet"
data_sent = {"type": "note", "title": title, "body": body}
API_KEY = 'xxxxxxxxxxxxxxxxxxxxxxxxxxx'
pb_headers = {
'Authorization': 'Bearer ' + API_KEY,
'Content-Type': 'application/json'
}
r = urequests.post(
'https://api.pushbullet.com/v2/pushes',
data=json.dumps(data_sent),
headers=pb_headers
)
print(r)
Error:
ssl_handshake_status: -256
Traceback (most recent call last):
File "<stdin>", line 11, in <module>
File "urequests.py", line 104, in post
File "urequests.py", line 56, in request
OSError: [Errno 5] EIO
Pushed:
import json
import urequests
payload = {
"app_key": "xxxxxxxxxxxxxxxxxxxxxxxxxxx",
"app_secret": "xxxxxxxxxxxxxxxxxxxxxxxxxxx",
"target_type": "app",
"content": "Remote Mic MCU test from ESP8266"
}
r = urequests.post("https://api.pushed.co/1/push", data=payload)
print(r)
Error:
Traceback (most recent call last):
File "<stdin>", line 8, in <module>
File "urequests.py", line 104, in post
File "urequests.py", line 74, in request
TypeError: object with buffer protocol required
Searching for these errors, doesn't get me anywhere useful.
The exact same code snippets work OK on my Linux box (using requests instead of urequests), but I understand that urequests may have some limitations.
Do you have any hint on how to fix this?

Answer 1

The exception message suggests that you pass the type of data which urequests doesn't expect. From my knowledge of how HTTP POST works (see HTTP standard), I know that it accepts octet stream, which in Python would be represented by str or bytes type. Whereas you pass a dictionary.
`

Answer 2

problem is with urequests library, if you can switchback to usocket and close the socket before timeout then works fine. For urequests you need to have a board with spiram.