Port, board and/or hardware

ESP32_GENERIC_C3-20250415-v1.25.0

MicroPython version

MicroPython v1.25.0 on 2025-04-15; ESP32C3 module with ESP32C3

Reproduction

import requests
url = 'https://tie.digitraffic.fi/api/weather/v1/stations/2020/data'
headers = {'Digitraffic-User': 'NOT DISCLOSED'}
response = requests.get(url,headers=headers)

Expected behaviour

In a PC running Linux (Fedora 40) and Python 3.13.2:

response = requests.get(url,headers=headers)
response.status_code
200
response.reason
'OK'
response.headers
{'Content-Type': 'application/json;charset=UTF-8',
'Transfer-Encoding': 'chunked', 'Connection': 'keep-alive', 'Date':
'Tue, 15 Apr 2025 09:23:06 GMT', 'Server': 'openresty',
'Last-Modified': 'Tue, 15 Apr 2025 09:20:10 GMT', 'ETag':
'W/"09f42986e01c2306e4bebc097160cff60"', 'Expires': 'Tue, 15 Apr 2025
09:24:06 GMT', 'Cache-Control': 'max-age=60',
'access-control-allow-origen': '*', 'access-control-allow-methods':
'GET, POST, OPTIONS', 'access-control-allow-headers':
'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Digitraffic-User',
'access-control-expose-headers':
'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Digitraffic-User',
'Content-Encoding': 'gzip', 'X-Cache': 'Miss from cloudfront', 'Via':
'1.1 14b5d848e0a4cab1de054891ea1e787c.cloudfront.net (CloudFront)',
'X-Amz-Cf-Pop': 'HEL51-P1', 'Alt-Svc': 'h3=":443"; ma=86400',
'X-Amz-Cf-Id': '67LEquPoJdsZmDbo3Uyjg7BjMmfh6RqcG9I36LhifjvONyR3W0fC7g=='}

Observed behaviour

In MicroPython 1.24.1 and 1.25.0 on a ESP32-C3:

response = requests.get(url,headers=headers)
response.status_code
406
response.reason
b'Not Acceptable'
response.headers
{'Vary': 'Origin', 'Connection': 'close', 'Content-Length': '70',
'Via': '1.1 1be5216f770ec05deb91e9e25b61b898.cloudfront.net
(CloudFront)', 'X-Cache': 'Miss from cloudfront', 'X-Amz-Cf-Pop':
'HEL51-P1', 'Server': 'CloudFront', 'Alt-Svc': 'h3=":443"; ma=86400',
'X-Amz-Cf-Id': 'AVTra_4NUASUqg3TDQcLxIc9np2vn7V1fGqCEXRUTomDTefEdurI_g==',
'Date': 'Tue, 15 Apr 2025 09:20:33 GMT'}
response.text
'Use of gzip compression is required with Accept-Encoding: gzip header.'

I have tried the following header values in my request but the result
is always the same:

'Accept-Encoding': 'gzip'
'Accept-Encoding': 'gzip, deflate'
'Accept-Encoding': 'identity'
'Accept-Encoding': 'deflate'
'Accept-Encoding': '*'

Additional Information

The server that I'm calling seems to require using gzip. And it works in Python but not in MicroPython.

Code of Conduct

Yes, I agree