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[Bug]: Incompatible with urllib3 2.x - AttributeError: 'HTTPResponse' object has no attribute 'getheader' #58
Description
What happened?
The latest version of the API library (2.2.1) throws an exception when creating a notification with urllib3 2.x installed.
Error:
AttributeError: 'HTTPResponse' object has no attribute 'getheader'
The issue is in onesignal/rest.py line 43, where RESTResponse.getheader() calls self.urllib3_response.getheader(). This method was removed in urllib3 2.0 (April 2023).
The package declares urllib3>=1.25.3 with no upper bound, but the code is not compatible with urllib3 2.x.
Steps to reproduce?
1. Install onesignal-python-api==2.2.1 with urllib3>=2.0 (e.g., urllib3==2.5.0)
2. Create and send a notification using the API
3. Observe AttributeError: 'HTTPResponse' object has no attribute 'getheader'What did you expect to happen?
The notification should be sent successfully. Either:
- The SDK should be updated to use the urllib3 2.x API (
.headers.get()instead of.getheader()) - Or the package should pin
urllib3>=1.25.3,<2until fixed
Code of Conduct
- I agree to follow this project's Code of Conduct
Activity
plisker commentedon Dec 16, 2025
+1 to this issue. Caused an unexpected outage recently in a project I'm working on.
Also, want to express a strong preference between the two remediation options that the SDK is updated to use
urllib32.6.0 or higher given recent CVEsCVE-2025-66471andCVE-2025-66418.kolbydanner95 commentedon Jan 8, 2026
+1 any update on this?
sherwinski commentedon Jul 28, 2026
Hey everyone, thanks for your patience on this as we work on a fix.
We currently have an update staged here #110. I'll follow up once a new version has been published.
fix: add v5.11.1 package updates (#111)
github-actions commentedon Jul 29, 2026
🎉 This issue has been resolved in version 5.11.1 🎉
The release is available on GitHub release
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