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feat: passthrough upstream response headers to clients

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CPA previously stripped ALL response headers from upstream AI provider
APIs, preventing clients from seeing rate-limit info, request IDs,
server-timing and other useful headers.

Changes:
- Add Headers field to Response and StreamResult structs
- Add FilterUpstreamHeaders helper (hop-by-hop + security denylist)
- Add WriteUpstreamHeaders helper (respects CPA-set headers)
- ExecuteWithAuthManager/ExecuteCountWithAuthManager now return headers
- ExecuteStreamWithAuthManager returns headers from initial connection
- All 11 provider executors populate Response.Headers
- All handler call sites write filtered upstream headers before response

Filtered headers (not forwarded):
- RFC 7230 hop-by-hop: Connection, Transfer-Encoding, Keep-Alive, etc.
- Security: Set-Cookie
- CPA-managed: Content-Length, Content-Encoding
This commit is contained in:
Kirill Turanskiy
2026-02-18 00:16:22 +03:00
parent 453aaf8774
commit 1f8f198c45
24 changed files with 192 additions and 107 deletions
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7
internal/runtime/executor/aistudio_executor.go
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@@ -164,12 +164,12 @@ func (e *AIStudioExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth,
reporter.publish(ctx, parseGeminiUsage(wsResp.Body))
var param any
out := sdktranslator.TranslateNonStream(ctx, body.toFormat, opts.SourceFormat, req.Model, opts.OriginalRequest, translatedReq, wsResp.Body, &param)
resp = cliproxyexecutor.Response{Payload: ensureColonSpacedJSON([]byte(out))}
resp = cliproxyexecutor.Response{Payload: ensureColonSpacedJSON([]byte(out)), Headers: wsResp.Headers.Clone()}
return resp, nil
}
// ExecuteStream performs a streaming request to the AI Studio API.
func (e *AIStudioExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (stream <-chan cliproxyexecutor.StreamChunk, err error) {
func (e *AIStudioExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (_ *cliproxyexecutor.StreamResult, err error) {
if opts.Alt == "responses/compact" {
return nil, statusErr{code: http.StatusNotImplemented, msg: "/responses/compact not supported"}
}
@@ -254,7 +254,6 @@ func (e *AIStudioExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth
return nil, statusErr{code: firstEvent.Status, msg: body.String()}
}
out := make(chan cliproxyexecutor.StreamChunk)
stream = out
go func(first wsrelay.StreamEvent) {
defer close(out)
var param any
@@ -318,7 +317,7 @@ func (e *AIStudioExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth
}
}
}(firstEvent)
return stream, nil
return &cliproxyexecutor.StreamResult{Headers: firstEvent.Headers.Clone(), Chunks: out}, nil
}
// CountTokens counts tokens for the given request using the AI Studio API.