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Retry OpenRouter failures sent with a 200 status - #3426
Non-streaming: "a 200 OK whose JSON body holds only an error object and no choices", where error.code is the HTTP status the failure maps to. The same page also shows a partial answer with finish_reason: "error" and the error object on the choice.
Streaming: a chat.completion.chunk with a top-level error object and a choice with finish_reason: "error", after which the stream ends.
Chat did not decode error. A body with no choices became WrapError("no choices in response"), which has status 0 and is not retryable, so ChatWithRetry gave up at once and the provider's code and message were lost. A partial answer that ended in an error came back as a success. The stream parser skipped the error chunk, so a stream that broke mid-answer ended as if it were complete.
Fix
In internal/llm/providers/openrouter:
An error object at the top level, or on the first choice, becomes an APIError with the reported code and message, classified by the shared status rules (llm.NewAPIError). On top of those rules, any 5xx is retryable, since the upstream provider failed after accepting the request, and metadata.error_type: "context_length_exceeded" is ErrContextTooLong whatever the message says. Other 4xx codes are not retried.
A body with no choices and no error is a retryable APIError.
An error chunk in a stream ends the stream with the same APIError. The chat executor already retries a retryable stream error when nothing was emitted yet.
openai, local and zai have the same "no choices in response" line, but their APIs do not document a 200 response with an error body, so they are unchanged.
Tests
internal/llm/providers/openrouter/openrouter_test.go, against an llmtest.Server through llm.ChatWithRetry:
TestChatRetriesTransientFailureInBody: a 502 error object, a 429, a 520, a 502 error on a partial choice, and an empty choices list are each retried, and the next answer is returned.
TestChatRequestErrorInBody: a 403 moderation error and two 400 context-length errors are not retried and carry their message. One context error is found by its message, the other by its error_type, and both are ErrContextTooLong.
TestStreamErrorChunk: an error chunk after a partial delta ends the stream with a retryable error that carries the message.
Each rule was mutation-checked. Removing any one of them fails at least one of these tests: the top-level error, the choice error, the stream error chunk, the no-choices retry, the 5xx range, the typed context-length error, or the message classification. So does forcing error bodies to always or never retry.
Summary by CodeRabbit
Bug Fixes
OpenRouter errors in chat responses and streaming chunks are now reported correctly.
Temporary server errors can be retried, while other errors are returned without retrying.
Empty responses and context-length errors are handled with clearer error reporting.
OpenRouter sends 200 as soon as the upstream provider accepts a
request, so a provider failure during generation arrives as an error
object in the body with no choices. Chat dropped that object and
returned a non-retryable "no choices in response" with status 0, so a
single transient upstream failure failed the whole step.
The error object now becomes an APIError with its code and message:
retried when the code is transient, classified like the same status
otherwise. An error on the first choice and an error chunk mid-stream
are handled the same way. An answer with no choices and no error is
retried as transient.
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Walkthrough
OpenRouter chat responses now report upstream errors and return retryable errors when no choices are present. Streaming stops when a chunk contains an error and emits a completed event with the converted API error.
Chat checks top-level and first-choice errors, and returns a retryable API error when the response has no choices. Tests cover retries, moderation errors, and context-length classification.
Streaming emits a completed event with the converted API error and stops processing when a chunk contains an error. A test covers an error after partial content.
dagucloud/dagu#3329: Both PRs extend the OpenRouter response and stream paths.
Merge Risk: Minimal · up to e40d7
No actionable merge-blocking risk remains from the reviewed changes.
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The title clearly and concisely identifies the main change: retrying OpenRouter failures reported with HTTP 200 responses.
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Actionable comments posted: 2
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @internal/llm/providers/openrouter/openrouter.go:
- Around line 489-490: Update responseError.apiError to inspect the documented
metadata.error_type field and classify "context_length_exceeded" as
llm.ErrContextTooLong before falling back to message-based parsing; preserve the
existing behavior for other errors.
- Around line 489-490: Update responseError.apiError so OpenRouter body errors
with codes in the 5xx range are marked retryable, including code 520, while
preserving llm.NewAPIError behavior for other codes and avoiding changes to
retry classification for other providers.
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A failure OpenRouter reports in a 200 body went through the shared
HTTP status rules, which retry only selected server errors and find a
context-length error only by its message. A body error comes after the
upstream provider accepted the request, so any server error there is
retryable. OpenRouter also tags each failure with a typed error_type,
so context_length_exceeded now classifies as a context-length error
whatever message the upstream provider sent.
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Summary
A desktop
computer.runact withprovider: openrouter(openai/gpt-6.1-terra) failed twice in a row, in separate runs, with:The failure was a transient upstream one, but nothing retried it, so the whole step failed.
Root cause
OpenRouter sends
200 OKas soon as the upstream provider accepts a request. A failure after that point is reported in the body (https://openrouter.ai/docs/api/reference/errors-and-debugging):200 OKwhose JSON body holds only anerrorobject and nochoices", whereerror.codeis the HTTP status the failure maps to. The same page also shows a partial answer withfinish_reason: "error"and theerrorobject on the choice.chat.completion.chunkwith a top-levelerrorobject and a choice withfinish_reason: "error", after which the stream ends.Chatdid not decodeerror. A body with no choices becameWrapError("no choices in response"), which has status 0 and is not retryable, soChatWithRetrygave up at once and the provider's code and message were lost. A partial answer that ended in an error came back as a success. The stream parser skipped the error chunk, so a stream that broke mid-answer ended as if it were complete.Fix
In
internal/llm/providers/openrouter:errorobject at the top level, or on the first choice, becomes anAPIErrorwith the reported code and message, classified by the shared status rules (llm.NewAPIError). On top of those rules, any 5xx is retryable, since the upstream provider failed after accepting the request, andmetadata.error_type: "context_length_exceeded"isErrContextTooLongwhatever the message says. Other 4xx codes are not retried.APIError.APIError. The chat executor already retries a retryable stream error when nothing was emitted yet.openai,localandzaihave the same "no choices in response" line, but their APIs do not document a 200 response with an error body, so they are unchanged.Tests
internal/llm/providers/openrouter/openrouter_test.go, against anllmtest.Serverthroughllm.ChatWithRetry:TestChatRetriesTransientFailureInBody: a 502errorobject, a 429, a 520, a 502 error on a partial choice, and an emptychoiceslist are each retried, and the next answer is returned.TestChatRequestErrorInBody: a 403 moderation error and two 400 context-length errors are not retried and carry their message. One context error is found by its message, the other by itserror_type, and both areErrContextTooLong.TestStreamErrorChunk: an error chunk after a partial delta ends the stream with a retryable error that carries the message.Each rule was mutation-checked. Removing any one of them fails at least one of these tests: the top-level error, the choice error, the stream error chunk, the no-choices retry, the 5xx range, the typed context-length error, or the message classification. So does forcing error bodies to always or never retry.
Summary by CodeRabbit