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import { NextRequest, NextResponse } from "next/server";
import { getServerSideConfig } from "@/app/config/server";
export async function handle(
req: NextRequest,
{ params }: { params: { path: string[] } },
) {
console.log("[Proxy Route] params ", params);
if (req.method === "OPTIONS") {
return NextResponse.json({ body: "OK" }, { status: 200 });
}
const serverConfig = getServerSideConfig();
// remove path params from searchParams
req.nextUrl.searchParams.delete("path");
req.nextUrl.searchParams.delete("provider");
const subpath = params.path.join("/");
const fetchUrl = `${req.headers.get(
"x-base-url",
)}/${subpath}?${req.nextUrl.searchParams.toString()}`;
const skipHeaders = ["connection", "host", "origin", "referer", "cookie"];
const headers = new Headers(
Array.from(req.headers.entries()).filter((item) => {
if (
item[0].indexOf("x-") > -1 ||
item[0].indexOf("sec-") > -1 ||
skipHeaders.includes(item[0])
) {
return false;
}
return true;
}),
);
// if dalle3 use openai api key
const baseUrl = req.headers.get("x-base-url");
if (baseUrl?.includes("api.openai.com")) {
if (!serverConfig.apiKey) {
return NextResponse.json(
{ error: "OpenAI API key not configured" },
{ status: 500 },
);
}
headers.set("Authorization", `Bearer ${serverConfig.apiKey}`);
}
const controller = new AbortController();
const fetchOptions: RequestInit = {
headers,
method: req.method,
body: req.body,
// to fix #2485: https://stackoverflow.com/questions/55920957/cloudflare-worker-typeerror-one-time-use-body
redirect: "manual",
// @ts-ignore
duplex: "half",
signal: controller.signal,
};
const timeoutId = setTimeout(
() => {
controller.abort();
},
10 * 60 * 1000,
);
try {
const res = await fetch(fetchUrl, fetchOptions);
// to prevent browser prompt for credentials
const newHeaders = new Headers(res.headers);
newHeaders.delete("www-authenticate");
// to disable nginx buffering
newHeaders.set("X-Accel-Buffering", "no");
// The latest version of the OpenAI API forced the content-encoding to be "br" in json response
// So if the streaming is disabled, we need to remove the content-encoding header
// Because Vercel uses gzip to compress the response, if we don't remove the content-encoding header
// The browser will try to decode the response with brotli and fail
newHeaders.delete("content-encoding");
return new Response(res.body, {
status: res.status,
statusText: res.statusText,
headers: newHeaders,
});
} finally {
clearTimeout(timeoutId);
}
}
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