Supabase Edge Function API Proxy

apiProxy.edge.index.ts

import { serve } from "https://deno.land/[email protected]/http/server.ts";
serve(async (req)=>{
  // 1) Coloque aqui exatamente o host e porta da sua API, sem typo:
  const TARGET = "http://001.002.003.004:8080";
  // 2) Se você quer forçar TODO proxy a ir em /extrair-dados,
  //    não precisa nem olhar o req.url.pathname — basta:
  const dest = `${TARGET}/extrair-dados`;
  console.log("Proxying to:", dest);
  // 3) Preserva headers hop-by-hop, content-type, etc.
  const outHeaders = new Headers();
  for (const [k, v] of req.headers){
    const lk = k.toLowerCase();
    if ([
      "connection",
      "keep-alive",
      "proxy-authenticate",
      "proxy-authorization",
      "te",
      "trailers",
      "transfer-encoding",
      "upgrade"
    ].includes(lk)) continue;
    outHeaders.set(k, v);
  }
  // (Opcional) CORS
  outHeaders.set("Access-Control-Allow-Origin", "*");
  // 4) Encaminha método, headers e body cru (multipart incluso)
  const resp = await fetch(dest, {
    method: req.method,
    headers: outHeaders,
    body: [
      "GET",
      "HEAD"
    ].includes(req.method) ? undefined : req.body
  });
  console.log("← External API replied:", resp.status);
  // 5) Retorna resposta ao client
  const clientHeaders = new Headers(resp.headers);
  clientHeaders.set("Access-Control-Allow-Origin", "*");
  return new Response(resp.body, {
    status: resp.status,
    headers: clientHeaders
  });
});

A lightweight Deno Edge Function for Supabase that turns your function endpoint into a transparent HTTP proxy. Incoming requests (any method, including multipart POST) are forwarded to a fixed backend URL (/extrair-dados), preserving all headers except hop-by-hop ones. CORS is enabled (Access-Control-Allow-Origin: *) so you can safely call this from a browser. Just update the TARGET constant to point at your own API host and port—no other changes required.