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.

Source-backed Last updated May 18, 2026 1 source Needs local verification

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: May 18, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Anthropic API, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

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.

Diagnostic flow for this page

Match ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash exactly before applying the quick fix.
Compare the failing environment with Anthropic API versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash mean in Anthropic API?

ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash indicates the workflow described by "Anthropic Bedrock Cross-Region SSE Events Raise Raw ValueError Instead of APIStatusError" failed in a Anthropic API context. Start by confirming the exact signature and the component that emitted it.

What should I check first for ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash?

Check whether this cause matches your environment: 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.

Is the ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash guidance source-backed?

The "Anthropic Bedrock Cross-Region SSE Events Raise Raw ValueError Instead of APIStatusError" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash?

For "Anthropic Bedrock Cross-Region SSE Events Raise Raw ValueError Instead of APIStatusError", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging ValueError: Bad response code, expected 200: {'status_code': 400, 'headers': {':exception-type': 'internalServerException'}} — async bedrock cross-region inference profile SSE decoding crash?

For "Anthropic Bedrock Cross-Region SSE Events Raise Raw ValueError Instead of APIStatusError", collect the failing Anthropic API command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.