diff --git a/.eslintrc b/.eslintrc
index 1792a589..487ed31c 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -7,7 +7,9 @@
     "mocha": true,
   },
   "globals": {},
-  "parserOptions": { "ecmaVersion": 8 },
+  "parserOptions": {
+    "ecmaVersion": 8
+  },
   "rules": {
     "camelcase": [
       2,
@@ -21,8 +23,13 @@
       2,
       {
         "ArrayExpression": 1,
-        "CallExpression": {"arguments": 1},
-        "FunctionDeclaration": {"body": 1, "parameters": 2},
+        "CallExpression": {
+          "arguments": 1
+        },
+        "FunctionDeclaration": {
+          "body": 1,
+          "parameters": 2
+        },
         "MemberExpression": 1,
         "ObjectExpression": 1,
         "SwitchCase": 1
@@ -61,10 +68,13 @@
     "no-undef": 2,
     "no-unused-vars": 2,
     "no-eq-null": 2,
-    "space-before-function-paren": ["error", {
+    "space-before-function-paren": [
+      "error",
+      {
         "anonymous": "always",
         "named": "never"
-    }],
+      }
+    ],
     "no-empty": [
       2,
       {
@@ -150,7 +160,10 @@
     ],
     "lines-around-comment": [
       2,
-      { "afterLineComment": true, "allowBlockEnd": true }
+      {
+        "afterLineComment": false,
+        "allowBlockEnd": true
+      }
     ],
     "semi": [
       2,
@@ -165,4 +178,4 @@
       "unix"
     ]
   }
-}
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index b9c2c08d..9aed72f7 100644
--- a/README.md
+++ b/README.md
@@ -195,11 +195,12 @@ instance, but this is not a reliable interface. I expect to close this
 exploit in a future release, while providing an additional hook for mutating
 the userRes before sending.
 
-##### gzip responses
+##### gzip or Brotli responses
 
-If your proxy response is gzipped, this program will automatically unzip
-it before passing to your function, then zip it back up before piping it to the
-user response.  There is currently no way to short-circuit this behavior.
+If your proxy response is gzipped or Brotli-encoded, this program will
+automatically unzip it before passing to your function, then zip it back up
+before piping it to the user response. There is currently no way to
+short-circuit this behavior.
 
 #### limit
 
diff --git a/app/steps/decorateUserRes.js b/app/steps/decorateUserRes.js
index 5756f868..eee3ae0e 100644
--- a/app/steps/decorateUserRes.js
+++ b/app/steps/decorateUserRes.js
@@ -3,31 +3,54 @@
 var as = require('../../lib/as.js');
 var debug = require('debug')('express-http-proxy');
 var zlib = require('zlib');
+var brotli = require('iltorb');
 
-function isResGzipped(res) {
-  return res.headers['content-encoding'] === 'gzip';
+var ENCODING = {
+  gzip: 'gzip',
+  brotli: 'br'
+};
+
+function isResEncoded(res, encoding) {
+  return res.headers['content-encoding'] === encoding;
 }
 
-function zipOrUnzip(method) {
-  return function(rspData, res) {
+const id = data => Promise.resolve(data);
+
+function createGzipHandler(method) {
+  return function (data) {
     return new Promise(function (resolve, reject) {
-      if (isResGzipped(res) && rspData.length) {
-        zlib[method](rspData, function(err, buffer) {
-          if(err) {
-            reject(err);
-          } else {
-            resolve(buffer);
-          }
-        });
-      } else {
-        resolve(rspData);
+      if (!data || !data.length) {
+        return resolve(data);
       }
+      zlib[method](data, function (err, buffer) {
+        if (err) {
+          reject(err);
+        } else {
+          resolve(buffer);
+        }
+      });
+
     });
   };
 }
 
-var maybeUnzipPromise = zipOrUnzip('gunzip');
-var maybeZipPromise = zipOrUnzip('gzip');
+function createEncodingHandler(res) {
+  if (isResEncoded(res, ENCODING.gzip)) {
+    return {
+      decode: createGzipHandler('gunzip'),
+      encode: createGzipHandler('gzip')
+    };
+  } else if (isResEncoded(res, ENCODING.brotli)) {
+    return {
+      decode: brotli.decompress,
+      encode: brotli.compress
+    };
+  }
+  return {
+    decode: id,
+    encode: id
+  };
+}
 
 function verifyBuffer(rspd, reject) {
   if (!Buffer.isBuffer(rspd)) {
@@ -37,11 +60,11 @@ function verifyBuffer(rspd, reject) {
 
 function updateHeaders(res, rspdBefore, rspdAfter, reject) {
   if (!res.headersSent) {
-      res.set('content-length', rspdAfter.length);
+    res.set('content-length', rspdAfter.length);
   } else if (rspdAfter.length !== rspdBefore.length) {
-      var error = '"Content-Length" is already sent,' +
-          'the length of response data can not be changed';
-      return reject(new Error(error));
+    var error = '"Content-Length" is already sent, ' +
+      'the length of response data can not be changed';
+    return reject(new Error(error));
   }
 }
 
@@ -52,31 +75,32 @@ function decorateProxyResBody(container) {
     return Promise.resolve(container);
   }
 
-  var proxyResDataPromise = maybeUnzipPromise(container.proxy.resData, container.proxy.res);
   var proxyRes = container.proxy.res;
   var req = container.user.req;
   var res = container.user.res;
-  var originalResData; 
+  var originalResData;
 
   if (res.statusCode === 304) {
     debug('Skipping userResDecorator on response 304');
     return Promise.resolve(container);
   }
 
-  return proxyResDataPromise
-    .then(function(proxyResData){
+  const encodingHandler = createEncodingHandler(container.proxy.res);
+
+  return encodingHandler.decode(container.proxy.resData)
+    .then(function (proxyResData) {
       originalResData = proxyResData;
       return resolverFn(proxyRes, proxyResData, req, res);
     })
-    .then(function(modifiedResData) {
-      return new Promise(function(resolve, reject) {
+    .then(function (modifiedResData) {
+      return new Promise(function (resolve, reject) {
         var rspd = as.buffer(modifiedResData, container.options);
         verifyBuffer(rspd, reject);
         updateHeaders(res, originalResData, rspd, reject);
-        maybeZipPromise(rspd, container.proxy.res).then(function(buffer) {
+        encodingHandler.encode(rspd).then(function (buffer) {
           container.proxy.resData = buffer;
           resolve(container);
-        }).catch(function(error){
+        }).catch(function (error) {
           reject(error);
         });
       });
diff --git a/lib/as.js b/lib/as.js
index 1825fb93..63927587 100644
--- a/lib/as.js
+++ b/lib/as.js
@@ -10,9 +10,9 @@ function asBuffer(body, options) {
   if (Buffer.isBuffer(body)) {
     ret = body;
   } else if (typeof body === 'object') {
-    ret = new Buffer(JSON.stringify(body), options.reqBodyEncoding);
+    ret = Buffer.from(JSON.stringify(body), options.reqBodyEncoding);
   } else if (typeof body === 'string') {
-    ret = new Buffer(body, options.reqBodyEncoding);
+    ret = Buffer.from(body, options.reqBodyEncoding);
   }
   return ret;
 }
diff --git a/package-lock.json b/package-lock.json
index a0ab17a5..e40c6114 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,83 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@types/body-parser": {
+      "version": "1.17.1",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.17.1.tgz",
+      "integrity": "sha512-RoX2EZjMiFMjZh9lmYrwgoP9RTpAjSHiJxdp4oidAQVO02T7HER3xj9UKue5534ULWeqVEkujhWcyvUce+d68w==",
+      "dev": true,
+      "requires": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "@types/connect": {
+      "version": "3.4.32",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.32.tgz",
+      "integrity": "sha512-4r8qa0quOvh7lGD0pre62CAb1oni1OO6ecJLGCezTmhQ8Fz50Arx9RUszryR8KlgK6avuSXvviL6yWyViQABOg==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/express": {
+      "version": "4.17.2",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.2.tgz",
+      "integrity": "sha512-5mHFNyavtLoJmnusB8OKJ5bshSzw+qkMIBAobLrIM48HJvunFva9mOa6aBwh64lBFyNwBbs0xiEFuj4eU/NjCA==",
+      "dev": true,
+      "requires": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "*",
+        "@types/serve-static": "*"
+      }
+    },
+    "@types/express-serve-static-core": {
+      "version": "4.17.0",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.0.tgz",
+      "integrity": "sha512-Xnub7w57uvcBqFdIGoRg1KhNOeEj0vB6ykUM7uFWyxvbdE89GFyqgmUcanAriMr4YOxNFZBAWkfcWIb4WBPt3g==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*",
+        "@types/range-parser": "*"
+      }
+    },
+    "@types/iltorb": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@types/iltorb/-/iltorb-2.3.0.tgz",
+      "integrity": "sha512-Sa9udsJtXhLt277FDLp9kWGdfl7YGNhg5WFzBS00YEgLbQYYIAXM7zFEdaqfJ7pqQsvGzaDWpu/0Z27l95fqww==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/mime": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-2.0.1.tgz",
+      "integrity": "sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "12.12.12",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.12.tgz",
+      "integrity": "sha512-MGuvYJrPU0HUwqF7LqvIj50RZUX23Z+m583KBygKYUZLlZ88n6w28XRNJRJgsHukLEnLz6w6SvxZoLgbr5wLqQ==",
+      "dev": true
+    },
+    "@types/range-parser": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.3.tgz",
+      "integrity": "sha512-ewFXqrQHlFsgc09MK5jP5iR7vumV/BYayNC6PgJO2LPe8vrnNFyjQjSppfEngITi0qvfKtzFvgKymGheFM9UOA==",
+      "dev": true
+    },
+    "@types/serve-static": {
+      "version": "1.13.3",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.13.3.tgz",
+      "integrity": "sha512-oprSwp094zOglVrXdlo/4bAHtKTAxX6VT8FOZlBKrmyLbNvE1zxZyJ6yikMVtHIvwP45+ZQGJn+FdXGKTozq0g==",
+      "dev": true,
+      "requires": {
+        "@types/express-serve-static-core": "*",
+        "@types/mime": "*"
+      }
+    },
     "accepts": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
@@ -64,8 +141,7 @@
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
     },
     "ansi-styles": {
       "version": "2.2.1",
@@ -73,6 +149,20 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw=="
+    },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -109,6 +199,21 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
     "assertion-error": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
@@ -121,6 +226,18 @@
       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
       "dev": true
     },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "dev": true
+    },
+    "aws4": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
+      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
+      "dev": true
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -162,6 +279,41 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "requires": {
+        "tweetnacl": "^0.14.3"
+      }
+    },
+    "bl": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-3.0.0.tgz",
+      "integrity": "sha512-EUAyP5UHU5hxF8BPT0LKW8gjYLhq1DQIcneOX/pL/m2Alo+OYDQAJlHq+yseMP50Os2nHXOSic6Ss3vSQeyf4A==",
+      "requires": {
+        "readable-stream": "^3.0.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
+          "integrity": "sha512-jItXPLmrSR8jmTRmRWJXCnGJsfy85mB3Wd/uINMXA65yrnFo0cPClFIUWzo2najVNSl+mx7/4W8ttlLWJe99pQ==",
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
+      }
+    },
+    "bluebird": {
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.1.tgz",
+      "integrity": "sha512-DdmyoGCleJnkbp3nkbxTLJ18rjDsE4yCggEwKNXkeV123sPNfOCYeDoeuOY+F2FrSjO1YXcTU+dsy96KMy+gcg==",
+      "dev": true
+    },
     "body-parser": {
       "version": "1.18.3",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
@@ -239,6 +391,12 @@
       "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
       "dev": true
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "dev": true
+    },
     "chai": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.1.2.tgz",
@@ -296,6 +454,11 @@
       "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
       "dev": true
     },
+    "chownr": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.3.tgz",
+      "integrity": "sha512-i70fVHhmV3DtTl6nqvZOnIjbY0Pe4kAUjwHj8z0zAdgBtYrJyYwLKCCuRBQ5ppkyL0AkN7HKRnETdmdp1zqNXw=="
+    },
     "circular-json": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
@@ -323,6 +486,11 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+    },
     "color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -359,6 +527,55 @@
       "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==",
       "dev": true
     },
+    "compressible": {
+      "version": "2.0.17",
+      "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.17.tgz",
+      "integrity": "sha512-BGHeLCK1GV7j1bSmQQAi26X+GgWcTjLr/0tzSvMCl3LH1w1IJ4PFSPoV5316b30cneTziC+B1a+3OjoSUcQYmw==",
+      "dev": true,
+      "requires": {
+        "mime-db": ">= 1.40.0 < 2"
+      },
+      "dependencies": {
+        "mime-db": {
+          "version": "1.42.0",
+          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.42.0.tgz",
+          "integrity": "sha512-UbfJCR4UAVRNgMpfImz05smAXK7+c+ZntjaA26ANtkXLlOe947Aag5zdIcKQULAiF9Cq4WxBi9jUs5zkA84bYQ==",
+          "dev": true
+        }
+      }
+    },
+    "compression": {
+      "version": "1.7.4",
+      "resolved": "https://registry.npmjs.org/compression/-/compression-1.7.4.tgz",
+      "integrity": "sha512-jaSIDzP9pZVS4ZfQ+TzvtiWhdpFhE2RDHz8QJkpX9SIpLq88VueF5jJw6t+6CUQcAoA6t+x89MLrWAqpfDE8iQ==",
+      "dev": true,
+      "requires": {
+        "accepts": "~1.3.5",
+        "bytes": "3.0.0",
+        "compressible": "~2.0.16",
+        "debug": "2.6.9",
+        "on-headers": "~1.0.2",
+        "safe-buffer": "5.1.2",
+        "vary": "~1.1.2"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "dev": true
+        }
+      }
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -377,6 +594,11 @@
         "typedarray": "^0.0.6"
       }
     },
+    "console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
+    },
     "content-disposition": {
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       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
       "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
-      "dev": true,
       "requires": {
         "is-fullwidth-code-point": "^2.0.0",
         "strip-ansi": "^4.0.0"
@@ -1759,7 +2514,6 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
-      "dev": true,
       "requires": {
         "safe-buffer": "~5.1.0"
       }
@@ -1768,7 +2522,6 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
       "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-      "dev": true,
       "requires": {
         "ansi-regex": "^3.0.0"
       },
@@ -1776,16 +2529,14 @@
         "ansi-regex": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
-          "dev": true
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
         }
       }
     },
     "strip-json-comments": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
-      "dev": true
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
     },
     "superagent": {
       "version": "3.8.3",
@@ -1835,6 +2586,41 @@
         "string-width": "^2.1.1"
       }
     },
+    "tar-fs": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.0.0.tgz",
+      "integrity": "sha512-vaY0obB6Om/fso8a8vakQBzwholQ7v5+uy+tF3Ozvxv1KNezmVQAiWtcNmMHFSFPqL3dJA8ha6gdtFbfX9mcxA==",
+      "requires": {
+        "chownr": "^1.1.1",
+        "mkdirp": "^0.5.1",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.0.0"
+      }
+    },
+    "tar-stream": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.1.0.tgz",
+      "integrity": "sha512-+DAn4Nb4+gz6WZigRzKEZl1QuJVOLtAwwF+WUxy1fJ6X63CaGaUAxJRD2KEn1OMfcbCjySTYpNC6WmfQoIEOdw==",
+      "requires": {
+        "bl": "^3.0.0",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
+          "integrity": "sha512-jItXPLmrSR8jmTRmRWJXCnGJsfy85mB3Wd/uINMXA65yrnFo0cPClFIUWzo2najVNSl+mx7/4W8ttlLWJe99pQ==",
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
+      }
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -1856,6 +2642,38 @@
         "os-tmpdir": "~1.0.2"
       }
     },
+    "tough-cookie": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
+      "dev": true,
+      "requires": {
+        "psl": "^1.1.24",
+        "punycode": "^1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        }
+      }
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -1892,11 +2710,19 @@
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "utils-merge": {
       "version": "1.0.1",
@@ -1904,12 +2730,29 @@
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
       "dev": true
     },
+    "uuid": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
+      "dev": true
+    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
       "dev": true
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -1919,6 +2762,19 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs="
+    },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -1928,8 +2784,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
       "version": "0.2.1",
diff --git a/package.json b/package.json
index 05382784..86f789b0 100644
--- a/package.json
+++ b/package.json
@@ -30,16 +30,21 @@
   "devDependencies": {
     "body-parser": "^1.17.2",
     "chai": "^4.1.2",
+    "compression": "^1.7.4",
     "cookie-parser": "^1.4.3",
     "eslint": "^4.19.1",
     "express": "^4.15.4",
     "mocha": "^5.2.0",
     "nock": "^10.0.6",
+    "request": "^2.88.0",
+    "request-promise": "^4.2.5",
+    "shrink-ray-current": "^4.1.2",
     "supertest": "^3.4.2"
   },
   "dependencies": {
     "debug": "^3.0.1",
     "es6-promise": "^4.1.1",
+    "iltorb": "^2.4.4",
     "raw-body": "^2.3.0"
   },
   "contributors": [
diff --git a/test/bodyEncoding.js b/test/bodyEncoding.js
index 22360e2d..725ffe07 100644
--- a/test/bodyEncoding.js
+++ b/test/bodyEncoding.js
@@ -21,15 +21,17 @@ describe('body encoding', function () {
 
   this.timeout(10000);
 
-  var pngHex = '89504e470d0a1a0a0' +
-               '000000d4948445200' +
-               '00000100000001080' +
-               '60000001f15c48900' +
-               '00000a49444154789' +
-               'c6300010000050001' +
-               '0d0a2db4000000004' +
-               '9454e44ae426082';
-  var pngData = new Buffer(pngHex, 'hex');
+  var pngHex = [
+    '89504e470d0a1a0a0',
+    '000000d4948445200',
+    '00000100000001080',
+    '60000001f15c48900',
+    '00000a49444154789',
+    'c6300010000050001',
+    '0d0a2db4000000004',
+    '9454e44ae426082'
+  ].join('');
+  var pngData = Buffer.from(pngHex, 'hex');
 
   it('allow raw data', function (done) {
     var filename = os.tmpdir() + '/express-http-proxy-test-' + (new Date()).getTime() + '-png-transparent.png';
@@ -38,7 +40,7 @@ describe('body encoding', function () {
     app.use(proxy('localhost:8109', {
       reqBodyEncoding: null,
       proxyReqBodyDecorator: function (bodyContent) {
-        assert((new Buffer(bodyContent).toString('hex')).indexOf(pngData.toString('hex')) >= 0,
+        assert((Buffer.from(bodyContent).toString('hex')).indexOf(pngData.toString('hex')) >= 0,
           'body should contain same data');
         return bodyContent;
       }
diff --git a/test/support/proxyTarget.js b/test/support/proxyTarget.js
index b6ec0810..ae71ad89 100644
--- a/test/support/proxyTarget.js
+++ b/test/support/proxyTarget.js
@@ -16,14 +16,14 @@ function proxyTarget(port, timeout, handlers) {
   target.use(bodyParser.json());
   target.use(cookieParser());
 
-  target.use(function(req, res, next) {
-    setTimeout(function() {
+  target.use(function (req, res, next) {
+    setTimeout(function () {
       next();
-    },timeout);
+    }, timeout);
   });
 
   if (handlers) {
-    handlers.forEach(function(handler) {
+    handlers.forEach(function (handler) {
       target[handler.method](handler.path, handler.fn);
     });
   }
@@ -32,20 +32,20 @@ function proxyTarget(port, timeout, handlers) {
     res.send('OK');
   });
 
-  target.post('/post', function(req, res) {
+  target.post('/post', function (req, res) {
     req.pipe(res);
   });
 
-  target.use('/headers', function(req, res) {
+  target.use('/headers', function (req, res) {
     res.json({ headers: req.headers });
   });
 
-  target.use(function(err, req, res, next) {
+  target.use(function (err, req, res, next) {
     res.send(err);
     next();
   });
 
-  target.use(function(req, res) {
+  target.use(function (req, res) {
     res.sendStatus(404);
   });
 
diff --git a/test/userResDecorator.js b/test/userResDecorator.js
index b500ca5d..c15bf287 100644
--- a/test/userResDecorator.js
+++ b/test/userResDecorator.js
@@ -2,7 +2,14 @@
 
 var assert = require('assert');
 var express = require('express');
+var compression = require('compression');
+var shrinkRay = require('shrink-ray-current');
 var request = require('supertest');
+// superagent/supertest don't support `br` encoding
+// and fail to parse JSON
+var rp = require('request-promise');
+var brotli = require('iltorb');
+
 var proxy = require('../');
 
 describe('userResDecorator', function () {
@@ -11,8 +18,8 @@ describe('userResDecorator', function () {
     this.timeout(10000);
 
     var app;
-    var  slowTarget;
-    var  serverReference;
+    var slowTarget;
+    var serverReference;
 
     beforeEach(function () {
       app = express();
@@ -169,13 +176,111 @@ describe('userResDecorator', function () {
     request(proxyApp)
       .get('/')
       .expect(function (res) {
-        res.headers.location.match(/localhost:3000/);
+        assert(res.headers.location.match(/localhost:3000/));
       })
       .end(function () {
         server.close();
         done();
       });
   });
+
+  describe('when the server response is gzip-compressed', function () {
+    this.timeout(10000);
+
+    var app;
+    var target;
+    var targetServerReference;
+
+    beforeEach(function () {
+      app = express();
+      target = express();
+      target.use(compression({ threshold: 0 }));
+      target.get('/test', function (req, res) {
+        res.json({ x: 100 });
+      });
+      targetServerReference = target.listen(12345);
+    });
+
+    afterEach(function () {
+      targetServerReference.close();
+    });
+
+    it('properly handles decoding and reencoding', function (done) {
+      app.use('/proxy', proxy('http://127.0.0.1:12345', {
+        userResDecorator: function (_res, resData) {
+          const data = JSON.parse(resData.toString('utf8'));
+          data.x = data.x + 1;
+          return JSON.stringify(data);
+        }
+      }));
+
+      request(app)
+        .get('/proxy/test')
+        .set('Accept-Encoding', 'gzip')
+        .end(function (err, res) {
+          if (err) { return done(err); }
+          assert.equal(res.body.x, 101);
+          assert.equal(res.headers['content-encoding'], 'gzip');
+          done();
+        });
+    });
+  });
+
+  describe('when the server response is Brotli-compressed', function () {
+    this.timeout(10000);
+
+    var app;
+    var appServerReference;
+    var target;
+    var targetServerReference;
+
+    beforeEach(function () {
+      app = express();
+      appServerReference = app.listen(12346);
+      target = express();
+      target.use(shrinkRay({ threshold: 0, useZopfliForGzip: false }));
+      target.get('/test', function (req, res) {
+        res.json({ x: 100 });
+      });
+      targetServerReference = target.listen(12345);
+    });
+
+    afterEach(function () {
+      appServerReference.close();
+      targetServerReference.close();
+    });
+
+    it('properly handles decoding and reencoding', function (done) {
+      app.use('/proxy', proxy('localhost:12345', {
+        userResDecorator: function (_res, resData) {
+          const data = JSON.parse(resData.toString('utf8'));
+          data.x = data.x + 1;
+          return JSON.stringify(data);
+        }
+      }));
+
+      rp({
+        uri: 'http://127.0.0.1:12346/proxy/test',
+        resolveWithFullResponse: true,
+        // this ensures the body is returned as a buffer
+        // with the original binary data
+        encoding: null,
+        headers: {
+          'Accept-Encoding': 'br'
+        }
+      })
+        .then(function (res) {
+          assert.equal(res.headers['content-encoding'], 'br');
+          return brotli.decompress(res.body);
+        })
+        .then(function (body) {
+          body = JSON.parse(body);
+          assert.equal(body.x, 101);
+          done();
+        })
+        .catch(done);
+    });
+  });
 });