fix: fixed Brotli decompression; (#5353)

test: added decompression tests;
fix: added legacy `x-gzip` & `x-compress` encoding types;

lib/adapters/http.js

@@ -23,6 +23,11 @@ import EventEmitter from 'events';
 const zlibOptions = {
   flush: zlib.constants.Z_SYNC_FLUSH,
   finishFlush: zlib.constants.Z_SYNC_FLUSH
+};
+
+const brotliOptions = {
+  flush: zlib.constants.BROTLI_OPERATION_FLUSH,
+  finishFlush: zlib.constants.BROTLI_OPERATION_FLUSH
 }
 
 const isBrotliSupported = utils.isFunction(zlib.createBrotliDecompress);
@@ -417,7 +422,9 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
         switch (res.headers['content-encoding']) {
         /*eslint default-case:0*/
         case 'gzip':
+        case 'x-gzip':
         case 'compress':
+        case 'x-compress':
         case 'deflate':
           // add the unzipper to the body stream processing pipeline
           streams.push(zlib.createUnzip(zlibOptions));
@@ -427,7 +434,7 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
           break;
         case 'br':
           if (isBrotliSupported) {
-            streams.push(zlib.createBrotliDecompress(zlibOptions));
+            streams.push(zlib.createBrotliDecompress(brotliOptions));
             delete res.headers['content-encoding'];
           }
         }

lib/platform/browser/index.js

@@ -43,6 +43,7 @@ const isStandardBrowserEnv = (() => {
  const isStandardBrowserWebWorkerEnv = (() => {
   return (
     typeof WorkerGlobalScope !== 'undefined' &&
+    // eslint-disable-next-line no-undef
     self instanceof WorkerGlobalScope &&
     typeof self.importScripts === 'function'
   );