fix: request with brotli content encoding (#57)

* fix: request with brotli content encoding

* replaced gzip with decompress middleware

Author: wrongsahil

src/components/proxy-middleware/index.js

@@ -348,7 +348,7 @@ class ProxyMiddlewareManager {
   init_handlers = () => {
     this.proxy.onRequestHandlers = [];
     this.proxy.onConnectHandlers = [];
-    this.proxy.use(Proxy.gunzip);
+    this.proxy.use(Proxy.decompress);
 
     // this.init_ssl_tunneling_handler();
     this.init_amiusing_handler();

src/lib/proxy/index.js

@@ -1,5 +1,5 @@
-import DefaultExport, {Proxy, PROXY_HANDLER_TYPE, gunzip, wildcard} from "./lib/proxy"
+import DefaultExport, {Proxy, PROXY_HANDLER_TYPE, gunzip, decompress, wildcard} from "./lib/proxy"
 
 export default DefaultExport;
 
-export {Proxy, PROXY_HANDLER_TYPE, gunzip, wildcard}
+export {Proxy, PROXY_HANDLER_TYPE, gunzip, decompress, wildcard}

src/lib/proxy/lib/middleware/decompress.js

@@ -0,0 +1,30 @@
+"use strict";
+
+var zlib = require("zlib");
+
+const decompressMiddleware = {
+  onResponse: function (ctx, callback) {
+    if (
+      ctx.serverToProxyResponse.headers["content-encoding"] &&
+      ctx.serverToProxyResponse.headers["content-encoding"].toLowerCase() ==
+        "gzip"
+    ) {
+      delete ctx.serverToProxyResponse.headers["content-encoding"];
+      ctx.addResponseFilter(zlib.createGunzip());
+    } else if (
+      ctx.serverToProxyResponse.headers["content-encoding"] &&
+      ctx.serverToProxyResponse.headers["content-encoding"].toLowerCase() ==
+        "br"
+    ) {
+      delete ctx.serverToProxyResponse.headers["content-encoding"];
+      ctx.addResponseFilter(zlib.createBrotliDecompress());
+    }
+    return callback();
+  },
+  onRequest: function (ctx, callback) {
+    ctx.proxyToServerRequestOptions.headers["accept-encoding"] = "gzip";
+    return callback();
+  },
+};
+
+module.exports = decompressMiddleware;

src/lib/proxy/lib/middleware/gunzip.js

@@ -20,4 +20,4 @@ const gunzipMiddleware = {
   },
 };
 
-module.exports = gunzipMiddleware;
+module.exports = gunzipMiddleware;

src/lib/proxy/lib/proxy.ts

@@ -24,6 +24,7 @@ module.exports = function () {
 };
 
 module.exports.gunzip = require("./middleware/gunzip");
+module.exports.decompress = require("./middleware/decompress");
 module.exports.wildcard = require("./middleware/wildcard");
 
 var Proxy: any = function () {