fix(proxy): aggregate mislabeled SSE bodies in transform fallback (#2234)

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The Claude/Codex format-transform non-stream branch returned an opaque 422
"Failed to parse upstream response" whenever a 2xx upstream body was not
valid JSON. The common case: MaaS gateways force-stream a stream:false
request and return an SSE body with a non-SSE Content-Type, defeating the
header-only is_sse() check.

On serde failure, sniff for SSE and aggregate the chunks into a single
JSON, then run the existing converter so clients still receive a valid
non-stream response.

- chat_sse_to_response_value: aggregate chat.completion.chunk SSE
  (content / reasoning / refusal / tool_calls / legacy function_call),
  tool_calls index-keyed via BTreeMap to avoid unbounded densification,
  first-wins finish_reason, message-snapshot override, completeness and
  error-event guards; synthesize an id when the upstream omits one
- responses_sse_to_response_value: process the residual trailing block,
  tolerating truncation and skipping it once a completed event was seen
- enrich remaining parse failures with content-type / content-encoding /
  body-snippet diagnostics
- deflate: try zlib (RFC 9110) before raw; keep the content-encoding
  header for unsupported encodings
- gate zero-usage rows on the Claude transform path

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This commit is contained in:

Jason

2026-06-11 08:29:21 +08:00

parent e776160912

commit a6d718d0fc

2 changed files with 1118 additions and 26 deletions

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src-tauri/src/proxy/handlers.rs

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