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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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14
sdk/api/handlers/openai/openai_handlers.go
View File

@@ -425,12 +425,13 @@ func (h *OpenAIAPIHandler) handleNonStreamingResponse(c *gin.Context, rawJSON []
modelName := gjson.GetBytes(rawJSON, "model").String()
cliCtx, cliCancel := h.GetContextWithCancel(h, c, context.Background())
resp, errMsg := h.ExecuteWithAuthManager(cliCtx, h.HandlerType(), modelName, rawJSON, h.GetAlt(c))
resp, upstreamHeaders, errMsg := h.ExecuteWithAuthManager(cliCtx, h.HandlerType(), modelName, rawJSON, h.GetAlt(c))
if errMsg != nil {
h.WriteErrorResponse(c, errMsg)
cliCancel(errMsg.Error)
return
}
handlers.WriteUpstreamHeaders(c.Writer.Header(), upstreamHeaders)
_, _ = c.Writer.Write(resp)
cliCancel()
}
@@ -457,7 +458,7 @@ func (h *OpenAIAPIHandler) handleStreamingResponse(c *gin.Context, rawJSON []byt
modelName := gjson.GetBytes(rawJSON, "model").String()
cliCtx, cliCancel := h.GetContextWithCancel(h, c, context.Background())
dataChan, errChan := h.ExecuteStreamWithAuthManager(cliCtx, h.HandlerType(), modelName, rawJSON, h.GetAlt(c))
dataChan, upstreamHeaders, errChan := h.ExecuteStreamWithAuthManager(cliCtx, h.HandlerType(), modelName, rawJSON, h.GetAlt(c))
setSSEHeaders := func() {
c.Header("Content-Type", "text/event-stream")
@@ -490,6 +491,7 @@ func (h *OpenAIAPIHandler) handleStreamingResponse(c *gin.Context, rawJSON []byt
if !ok {
// Stream closed without data? Send DONE or just headers.
setSSEHeaders()
handlers.WriteUpstreamHeaders(c.Writer.Header(), upstreamHeaders)
_, _ = fmt.Fprintf(c.Writer, "data: [DONE]\n\n")
flusher.Flush()
cliCancel(nil)
@@ -498,6 +500,7 @@ func (h *OpenAIAPIHandler) handleStreamingResponse(c *gin.Context, rawJSON []byt
// Success! Commit to streaming headers.
setSSEHeaders()
handlers.WriteUpstreamHeaders(c.Writer.Header(), upstreamHeaders)
_, _ = fmt.Fprintf(c.Writer, "data: %s\n\n", string(chunk))
flusher.Flush()
@@ -525,13 +528,14 @@ func (h *OpenAIAPIHandler) handleCompletionsNonStreamingResponse(c *gin.Context,
modelName := gjson.GetBytes(chatCompletionsJSON, "model").String()
cliCtx, cliCancel := h.GetContextWithCancel(h, c, context.Background())
stopKeepAlive := h.StartNonStreamingKeepAlive(c, cliCtx)
resp, errMsg := h.ExecuteWithAuthManager(cliCtx, h.HandlerType(), modelName, chatCompletionsJSON, "")
resp, upstreamHeaders, errMsg := h.ExecuteWithAuthManager(cliCtx, h.HandlerType(), modelName, chatCompletionsJSON, "")
stopKeepAlive()
if errMsg != nil {
h.WriteErrorResponse(c, errMsg)
cliCancel(errMsg.Error)
return
}
handlers.WriteUpstreamHeaders(c.Writer.Header(), upstreamHeaders)
completionsResp := convertChatCompletionsResponseToCompletions(resp)
_, _ = c.Writer.Write(completionsResp)
cliCancel()
@@ -562,7 +566,7 @@ func (h *OpenAIAPIHandler) handleCompletionsStreamingResponse(c *gin.Context, ra
modelName := gjson.GetBytes(chatCompletionsJSON, "model").String()
cliCtx, cliCancel := h.GetContextWithCancel(h, c, context.Background())
dataChan, errChan := h.ExecuteStreamWithAuthManager(cliCtx, h.HandlerType(), modelName, chatCompletionsJSON, "")
dataChan, upstreamHeaders, errChan := h.ExecuteStreamWithAuthManager(cliCtx, h.HandlerType(), modelName, chatCompletionsJSON, "")
setSSEHeaders := func() {
c.Header("Content-Type", "text/event-stream")
@@ -593,6 +597,7 @@ func (h *OpenAIAPIHandler) handleCompletionsStreamingResponse(c *gin.Context, ra
case chunk, ok := <-dataChan:
if !ok {
setSSEHeaders()
handlers.WriteUpstreamHeaders(c.Writer.Header(), upstreamHeaders)
_, _ = fmt.Fprintf(c.Writer, "data: [DONE]\n\n")
flusher.Flush()
cliCancel(nil)
@@ -601,6 +606,7 @@ func (h *OpenAIAPIHandler) handleCompletionsStreamingResponse(c *gin.Context, ra
// Success! Set headers.
setSSEHeaders()
handlers.WriteUpstreamHeaders(c.Writer.Header(), upstreamHeaders)
// Write the first chunk
converted := convertChatCompletionsStreamChunkToCompletions(chunk)