LiteLLM / LiteLLM

LiteLLM Proxy stream_timeout Not Enforced on First Chunk

使用 LiteLLM Proxy 的用户发现 stream_timeout 参数在首 chunk 未生效，导致慢启动 provider（如 Bedrock）请求被错误终止 Includes evidence for LiteLLM troubleshooting demand.

Source-backed Last updated May 20, 2026 2 sources Needs local verification

Category: LiteLLM
Error signature: stream_timeout not enforced on first chunk; hanging providers cause completions to fail
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 20, 2026
Verification status: Source-backed
Evidence: 2 public source URLs

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 LiteLLM, 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

stream_timeout not enforced on first chunk; hanging providers cause completions to fail is a LiteLLM failure pattern reported for developers trying to 使用 litellm proxy 的用户发现 stream_timeout 参数在首 chunk 未生效，导致慢启动 provider（如 bedrock）请求被错误终止. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub BerriAI/litellm#19909 (2026-01-27) 确认 stream_timeout 在第一 chunk 不强制执行的问题。还有 #8652 (2025-02-18) 记录 Bedrock 模型的 Stream Timeout 失效。直接命中 P1 LiteLLM 类别，属于代理层计费/路由关键路径上的 bug。mapped to 'LiteLLM' approved category.

Common causes

GitHub BerriAI/litellm#19909 (2026-01-27) 确认 stream_timeout 在第一 chunk 不强制执行的问题。还有 #8652 (2025-02-18) 记录 Bedrock 模型的 Stream Timeout 失效。直接命中 P1 LiteLLM 类别，属于代理层计费/路由关键路径上的 bug。mapped to 'LiteLLM' approved category.

Quick fixes

Confirm the exact error signature matches stream_timeout not enforced on first chunk; hanging providers cause completions to fail.
Check the LiteLLM 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 stream_timeout not enforced on first chunk; hanging providers cause completions to fail exactly before applying the quick fix.
Compare the failing environment with LiteLLM 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 stream_timeout not enforced on first chunk; hanging providers cause completions to fail mean in LiteLLM?

stream_timeout not enforced on first chunk; hanging providers cause completions to fail indicates the workflow described by "LiteLLM Proxy stream_timeout Not Enforced on First Chunk" failed in a LiteLLM context. Start by confirming the exact signature and the component that emitted it.

What should I check first for stream_timeout not enforced on first chunk; hanging providers cause completions to fail?

Check whether this cause matches your environment: GitHub BerriAI/litellm#19909 (2026-01-27) 确认 stream_timeout 在第一 chunk 不强制执行的问题。还有 #8652 (2025-02-18) 记录 Bedrock 模型的 Stream Timeout 失效。直接命中 P1 LiteLLM 类别，属于代理层计费/路由关键路径上的 bug。mapped to 'LiteLLM' approved category.

Is the stream_timeout not enforced on first chunk; hanging providers cause completions to fail guidance source-backed?

The "LiteLLM Proxy stream_timeout Not Enforced on First Chunk" page is labeled source-backed. It has 2 public source URLs from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for stream_timeout not enforced on first chunk; hanging providers cause completions to fail?

For "LiteLLM Proxy stream_timeout Not Enforced on First Chunk", 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 stream_timeout not enforced on first chunk; hanging providers cause completions to fail?

For "LiteLLM Proxy stream_timeout Not Enforced on First Chunk", collect the failing LiteLLM command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.