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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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11
internal/runtime/executor/antigravity_executor.go
View File

@@ -232,7 +232,7 @@ attemptLoop:
reporter.publish(ctx, parseAntigravityUsage(bodyBytes))
var param any
converted := sdktranslator.TranslateNonStream(ctx, to, from, req.Model, opts.OriginalRequest, translated, bodyBytes, &param)
resp = cliproxyexecutor.Response{Payload: []byte(converted)}
resp = cliproxyexecutor.Response{Payload: []byte(converted), Headers: httpResp.Header.Clone()}
reporter.ensurePublished(ctx)
return resp, nil
}
@@ -436,7 +436,7 @@ attemptLoop:
reporter.publish(ctx, parseAntigravityUsage(resp.Payload))
var param any
converted := sdktranslator.TranslateNonStream(ctx, to, from, req.Model, opts.OriginalRequest, translated, resp.Payload, &param)
resp = cliproxyexecutor.Response{Payload: []byte(converted)}
resp = cliproxyexecutor.Response{Payload: []byte(converted), Headers: httpResp.Header.Clone()}
reporter.ensurePublished(ctx)
return resp, nil
@@ -645,7 +645,7 @@ func (e *AntigravityExecutor) convertStreamToNonStream(stream []byte) []byte {
}
// ExecuteStream performs a streaming request to the Antigravity API.
func (e *AntigravityExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (stream <-chan cliproxyexecutor.StreamChunk, err error) {
func (e *AntigravityExecutor) 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"}
}
@@ -775,7 +775,6 @@ attemptLoop:
}
out := make(chan cliproxyexecutor.StreamChunk)
stream = out
go func(resp *http.Response) {
defer close(out)
defer func() {
@@ -820,7 +819,7 @@ attemptLoop:
reporter.ensurePublished(ctx)
}
}(httpResp)
return stream, nil
return &cliproxyexecutor.StreamResult{Headers: httpResp.Header.Clone(), Chunks: out}, nil
}
switch {
@@ -968,7 +967,7 @@ func (e *AntigravityExecutor) CountTokens(ctx context.Context, auth *cliproxyaut
if httpResp.StatusCode >= http.StatusOK && httpResp.StatusCode < http.StatusMultipleChoices {
count := gjson.GetBytes(bodyBytes, "totalTokens").Int()
translated := sdktranslator.TranslateTokenCount(respCtx, to, from, count, bodyBytes)
return cliproxyexecutor.Response{Payload: []byte(translated)}, nil
return cliproxyexecutor.Response{Payload: []byte(translated), Headers: httpResp.Header.Clone()}, nil
}
lastStatus = httpResp.StatusCode