🐛 Bug Report: Client.call raises KeyError when error response omits Content-Type #174

👟 Reproduction steps

With SDK 27.0.0, use a synthetic requests.Response and patch requests.request so no network request is made:

from unittest.mock import patch
from requests import Response
from appwrite.client import Client

response = Response()
response.status_code = 502
response.url = "https://cloud.appwrite.io/v1/synthetic"
response._content = b"upstream unavailable"
response.headers = {}  # valid response without a Content-Type header

with patch("appwrite.client.requests.request", return_value=response):
    Client().call("get", "/synthetic")

👍 Expected behavior

The failed HTTP response should surface as AppwriteException (including its status/body where available), consistent with the SDK's documented error behavior.

👎 Actual Behavior

The call raises KeyError: 'Content-Type' from appwrite/client.py while handling the HTTP 502, hiding the original HTTP failure and bypassing AppwriteException.

🎲 Appwrite version

Different version (specify in environment): SDK package 27.0.0; no live Appwrite server was used.

💻 Operating system

Windows

🧱 Your Environment

CPython 3.13, requests 2.34.2. The reproduction patches the request function and uses only a synthetic response; it sends no network request and uses no credentials.

👀 Have you spent some time to check if this issue has been raised before?

• I checked and didn't find a similar issue. I reviewed the related client-error report 🐛 Bug Report: List Documents Not Working with SDK #108 and searched existing issues for Content-Type and KeyError AppwriteException; neither reports this missing-header failure.

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct

The SDK README describes this repository as auto-generated, and the repository's bot told PR #162 that direct pull requests are not accepted. I'm reporting the reproducible behavior here rather than editing generated code; please route the fix through the appropriate generator/source if applicable.