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backend/node_modules/hono/dist/helper/proxy/index.js

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+// src/helper/proxy/index.ts
+import { HTTPException } from "../../http-exception.js";
+var hopByHopHeaders = [
+  "connection",
+  "keep-alive",
+  "proxy-authenticate",
+  "proxy-authorization",
+  "te",
+  "trailer",
+  "transfer-encoding",
+  "upgrade"
+];
+var ALLOWED_TOKEN_PATTERN = /^[!#$%&'*+\-.0-9A-Z^_`a-z|~]+$/;
+var buildRequestInitFromRequest = (request, strictConnectionProcessing) => {
+  if (!request) {
+    return {};
+  }
+  const headers = new Headers(request.headers);
+  if (strictConnectionProcessing) {
+    const connectionValue = headers.get("connection");
+    if (connectionValue) {
+      const headerNames = connectionValue.split(",").map((h) => h.trim());
+      const invalidHeaders = headerNames.filter((h) => !ALLOWED_TOKEN_PATTERN.test(h));
+      if (invalidHeaders.length > 0) {
+        throw new HTTPException(400, {
+          message: `Invalid Connection header value: ${invalidHeaders.join(", ")}`
+        });
+      }
+      headerNames.forEach((headerName) => {
+        headers.delete(headerName);
+      });
+    }
+  }
+  hopByHopHeaders.forEach((header) => {
+    headers.delete(header);
+  });
+  return {
+    method: request.method,
+    body: request.body,
+    duplex: request.body ? "half" : void 0,
+    headers,
+    signal: request.signal
+  };
+};
+var preprocessRequestInit = (requestInit) => {
+  if (!requestInit.headers || Array.isArray(requestInit.headers) || requestInit.headers instanceof Headers) {
+    return requestInit;
+  }
+  const headers = new Headers();
+  for (const [key, value] of Object.entries(requestInit.headers)) {
+    if (value == null) {
+      headers.delete(key);
+    } else {
+      headers.set(key, value);
+    }
+  }
+  requestInit.headers = headers;
+  return requestInit;
+};
+var proxy = async (input, proxyInit) => {
+  const {
+    raw,
+    customFetch,
+    strictConnectionProcessing = false,
+    ...requestInit
+  } = proxyInit instanceof Request ? { raw: proxyInit } : proxyInit ?? {};
+  const req = new Request(input, {
+    ...buildRequestInitFromRequest(raw, strictConnectionProcessing),
+    ...preprocessRequestInit(requestInit)
+  });
+  req.headers.delete("accept-encoding");
+  const res = await (customFetch || fetch)(req);
+  const resHeaders = new Headers(res.headers);
+  hopByHopHeaders.forEach((header) => {
+    resHeaders.delete(header);
+  });
+  if (resHeaders.has("content-encoding")) {
+    resHeaders.delete("content-encoding");
+    resHeaders.delete("content-length");
+  }
+  return new Response(res.body, {
+    status: res.status,
+    statusText: res.statusText,
+    headers: resHeaders
+  });
+};
+export {
+  proxy
+};