fix(protocol): sub2api-parity audit — 9 conversion gaps across chat/responses/anthropic - #33
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…esponses/anthropic - chat->responses request: passthrough parallel_tool_calls/service_tier (top-level keys backfilled from raw body via preserveChatPassthroughKeys); map response_format to text.format (json_schema flatten / json_object type) - responses->chat stream/aggregate/nonstream: accept custom_tool_call + custom_tool_call_input delta/done on shared tool index (done reads input key); split incomplete reason (content_filter vs length); echo upstream service_tier on chat top level; treat response.done alias like completed - chat->anthropic request: strip temperature/top_p when thinking enabled - claude responses: content_filter stop_reason refusal -> end_turn (enum); stop branch falls back to tool_use when content holds tool_use blocks - usage/finish closed sets: cache_creation_input_tokens -> details 归位; normalizeFinishReason unknown -> stop - 11 regression tests in protocol_parity_sub2api_test.go; docs/API.md + CHANGELOG updated - live E2E (mimo-v2.6-flash direct + muse-spark responses-rule): 9/9 pass Co-Authored-By: Claude Code <noreply@anthropic.com>
同一客户端 token 下所有请求曾恒选同一池 key（仅哈希 token 部分）， 1811 把 key 实际只有 k36 在服务。现 sticky 复用完整 egress sticky 键 （token + 客户端会话后缀），同一会话仍粘定同 key（缓存亲和），不同 会话按哈希散开；failover 重试混入常量后缀跳离故障 key。 Co-Authored-By: Claude Code <noreply@anthropic.com>
stickySessionBase 对无 token（admin 密码触发池）的请求剥离共享 public fallback 前缀，以 sess:<会话后缀> 散列：不同网关会话散开， 同一会话仍粘定；有 token 路径保持 tok:<token>|cli:<会话> 不变。 回归测试覆盖 admin scope 散开 + 同 scope 粘定。 Co-Authored-By: Claude Code <noreply@anthropic.com>
withSessionFromRequest 实际克隆全部请求头供 sticky 路由使用， 而不仅是 x-opencode-session；改名为 withClientHeadersFromRequest 避免读者误以为客户端会话头被丢弃。无行为变更。 Co-Authored-By: Claude Code <noreply@anthropic.com>
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对照审计
以 Wei-Shaw/sub2api
backend/internal/pkg/apicompat为参照（chatcompletions_to_responses / responses_to_chatcompletions / chatcompletions_anthropic_bridge / anthropic_to_responses / responses_to_anthropic / responses_stream_event_wire / responses_namespace / types），辅以官方 Responses 流事件文档，对三条转换链路逐项对照，补齐 9 项差异。历史三个协议转换 issue（#17 工具索引分裂、#19 免费层指纹、#21 responses 指纹形状）已在 main 中修复并验证，本 PR 不碰那些路径，只补审计中新发现的 gaps。修复清单
parallel_tool_calls/service_tier透传上游（顶层键经preserveChatPassthroughKeys从原始 body 回填 ExtraBody，类型化结构装不下；extra_body显式键优先）；response_format映射为text.format（此前直接丢弃）。custom_tool_call纳入工具槽位，custom_tool_call_input.delta/done同形累积（done 读input键）；incomplete按reason细分（content_filter→content_filter）；上游service_tier回写 chat 顶层；response.done别名与completed同等终结。temperature/top_p（此前无条件透传→上游 400；与convertClaudeRequest同口径）。content_filter的stop_reason由非法枚举refusal改为end_turn；stop分支加 tool_use block 存在性回退。cache_creation_input_tokens→details 归位；normalizeFinishReason未知原因回退stop。测试
protocol_parity_sub2api_test.go11 用例（custom 工具同 index、content_filter 双路径、response.done 哨兵、service_tier 双路径、thinking 剥参、cache_creation 归位、未知 finish 闭集合、ExtraBody 回填等）。go test ./...全绿，go vet/gofmt干净。[DONE]、responses 流completed、messages 流message_stop，9/9 通过；thinking+temperature 同传 200。🤖 Generated with Claude Code