Anthropic API / Anthropic API
Anthropic Bedrock Cross-Region SSE Events Raise Raw ValueError Instead of APIStatusError
Developer using AsyncAnthropicBedrock needs proper exception type for non-200 SSE error frames from AWS Bedrock instead of raw Python ValueError crashes Includes evidence for Anthropic API troubleshooting demand.
- Category
- Anthropic API
- Error signature
ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash- Quick fix
- Compare the failing environment with a known working setup, then change one configuration value at a time.
- Updated
What this error means
ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash is a Anthropic API failure pattern reported for developers trying to developer using asyncanthropicbedrock needs proper exception type for non-200 sse error frames from aws bedrock instead of raw python valueerror crashes. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
PR #1555 open on anthropics/anthropic-sdk-python (created 2026-05-16): Bedrock returns non-200 status codes inside SSE event frames causing unhandled ValueError in AWSEventStreamDecoder. Affects production inference workloads. High commercial value due to Bedrock enterprise usage. Category: Anthropic API per approved mapping.
Common causes
- PR #1555 open on anthropics/anthropic-sdk-python (created 2026-05-16): Bedrock returns non-200 status codes inside SSE event frames causing unhandled ValueError in AWSEventStreamDecoder. Affects production inference workloads. High commercial value due to Bedrock enterprise usage. Category: Anthropic API per approved mapping.
Quick fixes
- Confirm the exact error signature matches
ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash. - Check the Anthropic API account, local tool state, and provider configuration involved in the failing workflow.
- Compare the failing environment with a known working setup, then change one configuration value at a time.
Platform/tool-specific checks
- Verify the command, editor, extension, or API client that produced the error.
- Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
- Avoid deleting credentials, local model data, or project settings until the failing scope is clear.
Step-by-step troubleshooting
- Capture the exact error message and the command, editor action, or request that triggered it.
- Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
- Review the source evidence below and compare it with your environment.
- Apply one change at a time and rerun the smallest failing action.
- Keep the working fix documented for the team or deployment environment.
How to prevent it
- Keep provider/tool configuration documented.
- Record non-secret diagnostics such as tool version, provider name, model name, and command path.
- Add a lightweight check before CI or production workflows depend on the tool.
Sources checked
Evidence note: PR #1555 open on anthropics/anthropic-sdk-python (created 2026-05-16): Bedrock returns non-200 status codes inside SSE event frames causing unhandled ValueError in AWSEventStreamDecoder. Affects production inference workloads. High commercial value due to Bedrock enterprise usage. Category: Anthropic API per approved mapping.
Related errors
- Anthropic API
FAQ
What should I check first?
Start with the exact ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash text and the smallest action that reproduces it.
Can I ignore this error?
No. Treat it as a failed Anthropic API workflow until the root cause is understood.
Is this guaranteed to have one fix?
No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.
How do I know the fix worked?
Rerun the same command, editor action, or request. The fix is working when that action completes without ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash.