thiagoelg commented on code in PR #3395:
URL: 
https://github.com/apache/incubator-kie-tools/pull/3395#discussion_r2705529077


##########
packages/cors-proxy/src/proxy/ExpressCorsProxy.ts:
##########
@@ -60,26 +59,33 @@ export class ExpressCorsProxy implements CorsProxy<Request, 
Response> {
       this.logger.debugEscapeNewLines("Request Method: ", req.method);
       this.logger.debugEscapeNewLines("Request Headers: ", req.headers);
 
-      // Creating the headers for the new request
+      // Build outgoing headers
       const outHeaders: Record<string, string> = { 
...info?.corsConfig?.customHeaders };
 
       Object.keys(req.headers).forEach((header) => {
         if (!BANNED_PROXY_HEADERS.includes(header) && !outHeaders[header]) {
           if (!info.corsConfig || 
info.corsConfig.allowHeaders.includes(header)) {
-            outHeaders[header] = req.headers[header] as string;
+            const value = req.headers[header];
+            // header value can be string | string[] | undefined
+            if (Array.isArray(value)) {
+              outHeaders[header] = value.join(", ");
+            } else if (typeof value === "string") {
+              outHeaders[header] = value;
+            }
           }
         }
       });
 
-      // TO DO: Figure out why this gzip encoding is broken with insecure tls 
certificates!
-      if 
(req.headers[CorsProxyHeaderKeys.INSECURELY_DISABLE_TLS_CERTIFICATE_VALIDATION] 
=== "true") {
-        outHeaders["accept-encoding"] = "identity";
-      }
       // Force uncompressed response if encoding is disabled via header
       if (req.headers[CorsProxyHeaderKeys.DISABLE_ENCODING] === "true") {
         outHeaders["accept-encoding"] = "identity";

Review Comment:
   I'm not sure how to test that...
   
   I've tried making requests to https://httpbin.org/brotli using the CORS 
Proxy, and it works fine (with or without the `accept-encoding` header).
   I've also tested different encodings available here: 
https://httpbin.org/#/Response_formats



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