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Forward user headers #24

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Merged
Wauplin merged 3 commits into from
Aug 6, 2025
Merged

Forward user headers #24

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63958bb
Forward user headers
Wauplin Aug 6, 2025
1703c3d
complete list
Wauplin Aug 6, 2025
f8ae968
use set for O(1) search
Wauplin Aug 6, 2025
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28 changes: 26 additions & 2 deletions src/routes/responses.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,23 @@ class StreamingError extends Error {
type IncompleteResponse = Omit<Response, "incomplete_details" | "output_text" | "parallel_tool_calls">;
const SEQUENCE_NUMBER_PLACEHOLDER = -1;

// All headers are forwarded by default, except these ones.
const NOT_FORWARDED_HEADERS = new Set([
"accept",
"accept-encoding",
"authorization",
"connection",
"content-length",
"content-type",
"host",
"keep-alive",
"te",
"trailer",
"trailers",
"transfer-encoding",
"upgrade",
]);

export const postCreateResponse = async (
req: ValidatedRequest<CreateResponseParams>,
res: ExpressResponse
Expand Down Expand Up @@ -169,6 +186,11 @@ async function* innerRunStream(
return;
}

// Forward headers (except authorization handled separately)
const defaultHeaders = Object.fromEntries(
Object.entries(req.headers).filter(([key]) => !NOT_FORWARDED_HEADERS.has(key.toLowerCase()))
) as Record<string, string>;

// Return early if not supported param
if (req.body.reasoning?.summary && req.body.reasoning?.summary !== "auto") {
throw new Error(`Not implemented: only 'auto' summary is supported. Got '${req.body.reasoning?.summary}'`);
Expand Down Expand Up @@ -429,7 +451,7 @@ async function* innerRunStream(
do {
previousMessageCount = currentMessageCount;

for await (const event of handleOneTurnStream(apiKey, payload, responseObject, mcpToolsMapping)) {
for await (const event of handleOneTurnStream(apiKey, payload, responseObject, mcpToolsMapping, defaultHeaders)) {
yield event;
}

Expand Down Expand Up @@ -499,11 +521,13 @@ async function* handleOneTurnStream(
apiKey: string | undefined,
payload: ChatCompletionCreateParamsStreaming,
responseObject: IncompleteResponse,
mcpToolsMapping: Record<string, McpServerParams>
mcpToolsMapping: Record<string, McpServerParams>,
defaultHeaders: Record<string, string>
): AsyncGenerator<PatchedResponseStreamEvent> {
const client = new OpenAI({
baseURL: process.env.OPENAI_BASE_URL ?? "https://router.huggingface.co/v1",
apiKey: apiKey,
defaultHeaders,
});
const stream = await client.chat.completions.create(payload);
let previousInputTokens = responseObject.usage?.input_tokens ?? 0;
Expand Down