Reproducible in:

# test.py
import sys
# Enable debug logging
import logging

from slack_sdk import WebClient

def uploadToSlackChannel():
    client = WebClient(
        token="you-slack-token", timeout=300)
    try:
        filepath = "file-to-upload"
        response = client.files_upload(
            channels="your-slack-channel-name", file=filepath)
        assert response["file"]  # the uploaded file
    except Exception as e:
        print(e)

uploadToSlackChannel()        

The Slack SDK version

slack-sdk==3.13.0

Python runtime version

Python 3.9.10

OS info

ProductName: Mac OS X
ProductVersion: 10.15.7
BuildVersion: 19H1615
Darwin Kernel Version 19.6.0: Sun Nov 14 19:58:51 PST 2021; root:xnu-6153.141.50~1/RELEASE_X86_64

Steps to reproduce:

(Share the commands to run, source code, and project settings (e.g., setup.py))

1. copy the above snippet to any file (e.g. upload_to_slack.py)
2. run python3 upload_to_slack.py

Expected result:

Should succeed without any error

Actual result:

The file gets uploaded but also throws this error

Received a response in a non-JSON format: stream timeout
The server responded with: {'status': 408, 'headers': {'x-edge-backend': 'envoy-www', 'content-length': '14', 'content-type': 'text/plain', 'x-slack-edge-shared-secret-outcome': 'no-match', 'date': 'Wed, 26 Jan 2022 07:12:45 GMT', 'server': 'envoy', 'via': 'envoy-edge-bom-jbcm', 'connection': 'close'}, 'body': 'stream timeout'}

Requirements

For general questions/issues about Slack API platform or its server-side, could you submit questions at https://my.slack.com/help/requests/new instead. 🙇

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.