added userResHeaderDecorator

types/express-http-proxy/express-http-proxy-tests.ts

@@ -16,5 +16,13 @@ proxy('www.google.com', {
         console.log(proxyReqOpts.headers, proxyReqOpts.method);
         console.log(srcReq.url, srcReq.cookies);
         return proxyReqOpts;
+    },
+    userResHeaderDecorator(headers, userReq, userRes, proxyReq, proxyRes) {
+        console.log(userReq.url, userRes.statusCode);
+        console.log(proxyReq.url, proxyRes.statusCode);
+        if (headers["content-type"] === "image/png") {
+            headers["x-custom-header"] = "additional-info";
+        }
+        return headers;
     }
 });

types/express-http-proxy/index.d.ts

@@ -1,15 +1,18 @@
 // Type definitions for express-http-proxy 1.5
 // Project: https://github.com/villadora/express-http-proxy#readme
-// Definitions by: ulrichb <https://github.com/ulrichb>
+// Definitions by:  ulrichb <https://github.com/ulrichb>
+//                  Daniel Schopf <https://github.com/Danscho>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
 import { RequestHandler, Request } from "express";
-import { RequestOptions } from "http";
+import { RequestOptions, IncomingHttpHeaders, OutgoingHttpHeaders } from "http";
+import { Response } from "express-serve-static-core";
 
 interface ProxyOptions {
     proxyReqPathResolver?: (req: Request) => string;
     proxyReqOptDecorator?: (proxyReqOpts: RequestOptions, srcReq: Request) => RequestOptions;
+    userResHeaderDecorator?: (headers: IncomingHttpHeaders, userReq: Request, userRes: Response, proxyReq: Request, proxyRes: Response) => OutgoingHttpHeaders;
 }
 
 declare function proxy(host: string, options?: ProxyOptions): RequestHandler;