diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 9a351f0..36349e5 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -67,3 +67,4 @@ Listed in no particular order:
 * Victor Didenko @victordidenko
 * Zong Jhe Wu @s25g5d4
 * Jade Michael Thornton @thornjad <jade@jmthorton.net>
+* Jack Lu @panlina <jacklu@jacklu.me>
diff --git a/README.md b/README.md
index e82247f..e1cd222 100644
--- a/README.md
+++ b/README.md
@@ -87,7 +87,6 @@ In node, pass ecstatic an options hash, and it will return your middleware!
 ```js
 const opts = {
   root: path.join(__dirname, 'public'),
-  baseDir: '/',
   autoIndex: true,
   showDir: true,
   showDotfiles: true,
@@ -128,14 +127,6 @@ In CLI mode, `opts.port` is the port you want ecstatic to listen to. Defaults
 to 8000. This can be overridden with the `--port` flag or with the PORT
 environment variable.
 
-### `opts.baseDir`
-### `--baseDir {dir}`
-
-`opts.baseDir` is `/` by default, but can be changed to allow your static files
-to be served off a specific route. For example, if `opts.baseDir === "blog"`
-and `opts.root = "./public"`, requests for `localhost:8080/blog/index.html` will
-resolve to `./public/index.html`.
-
 ### `opts.cache`
 ### `--cache {value}`
 
diff --git a/lib/ecstatic.js b/lib/ecstatic.js
index 7827408..fa6fb19 100644
--- a/lib/ecstatic.js
+++ b/lib/ecstatic.js
@@ -97,7 +97,6 @@ module.exports = function createMiddleware(_dir, _options) {
   const opts = optsParser(options);
   const cache = opts.cache;
   const autoIndex = opts.autoIndex;
-  const baseDir = opts.baseDir;
   let defaultExt = opts.defaultExt;
   const handleError = opts.handleError;
   const headers = opts.headers;
@@ -206,7 +205,7 @@ module.exports = function createMiddleware(_dir, _options) {
     file = path.normalize(
       path.join(
         root,
-        path.relative(path.join('/', baseDir), pathname)
+        pathname
       )
     );
     // determine compressed forms if they were to exist
@@ -357,13 +356,15 @@ module.exports = function createMiddleware(_dir, _options) {
             // If there is no file extension in the path and we have a default
             // extension try filename and default extension combination before rendering 404.html.
             middleware({
+              baseUrl: req.baseUrl,
               url: `${parsed.pathname}.${defaultExt}${(parsed.search) ? parsed.search : ''}`,
               headers: req.headers,
             }, res, next);
           } else {
             // Try to serve default ./404.html
             middleware({
-              url: (handleError ? `/${path.join(baseDir, `404.${defaultExt}`)}` : req.url),
+              baseUrl: req.baseUrl,
+              url: (handleError ? `/404.${defaultExt}` : req.url),
               headers: req.headers,
               statusCode: 404,
             }, res, next);
@@ -380,13 +381,14 @@ module.exports = function createMiddleware(_dir, _options) {
           if (!parsed.pathname.match(/\/$/)) {
             res.statusCode = 302;
             const q = parsed.query ? `?${parsed.query}` : '';
-            res.setHeader('location', `${parsed.pathname}/${q}`);
+            res.setHeader('location', `${req.baseUrl || ''}${parsed.pathname}/${q}`);
             res.end();
             return;
           }
 
           if (autoIndex) {
             middleware({
+              baseUrl: req.baseUrl,
               url: urlJoin(
                 encodeURIComponent(pathname),
                 `/index.${defaultExt}`
diff --git a/lib/ecstatic/opts.js b/lib/ecstatic/opts.js
index d4b170d..ae64b98 100644
--- a/lib/ecstatic/opts.js
+++ b/lib/ecstatic/opts.js
@@ -198,7 +198,6 @@ module.exports = (opts) => {
     hidePermissions,
     si,
     defaultExt,
-    baseDir: (opts && opts.baseDir) || '/',
     gzip,
     brotli,
     handleError,
diff --git a/lib/ecstatic/show-dir/index.js b/lib/ecstatic/show-dir/index.js
index 573c172..852583b 100644
--- a/lib/ecstatic/show-dir/index.js
+++ b/lib/ecstatic/show-dir/index.js
@@ -18,7 +18,6 @@ module.exports = (opts) => {
   // opts are parsed by opts.js, defaults already applied
   const cache = opts.cache;
   const root = path.resolve(opts.root);
-  const baseDir = opts.baseDir;
   const humanReadable = opts.humanReadable;
   const hidePermissions = opts.hidePermissions;
   const handleError = opts.handleError;
@@ -33,10 +32,7 @@ module.exports = (opts) => {
     const dir = path.normalize(
       path.join(
         root,
-        path.relative(
-          path.join('/', baseDir),
-          pathname
-        )
+        pathname
       )
     );
 
@@ -95,7 +91,7 @@ module.exports = (opts) => {
           const writeRow = (file) => {
             // render a row given a [name, stat] tuple
             const isDir = file[1].isDirectory && file[1].isDirectory();
-            let href = `${parsed.pathname.replace(/\/$/, '')}/${encodeURIComponent(file[0])}`;
+            let href = `${req.baseUrl || ''}${parsed.pathname.replace(/\/$/, '')}/${encodeURIComponent(file[0])}`;
 
             // append trailing slash and query for dir entry
             if (isDir) {
diff --git a/test/304.js b/test/304.js
index 28a83af..28ce88f 100644
--- a/test/304.js
+++ b/test/304.js
@@ -2,27 +2,27 @@
 
 const test = require('tap').test;
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const path = require('path');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 test('304_not_modified_strong', (t) => {
   const port = Math.floor((Math.random() * ((1 << 16) - 1e4)) + 1e4);
   const file = 'a.txt';
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
       gzip: true,
-      baseDir,
       autoIndex: true,
       showDir: true,
       weakEtags: false,
       weakCompare: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
@@ -61,14 +61,13 @@ test('304_not_modified_weak', (t) => {
   const file = 'b.txt';
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
       gzip: true,
-      baseDir,
       autoIndex: true,
       showDir: true,
       weakCompare: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
@@ -106,15 +105,14 @@ test('304_not_modified_strong_compare', (t) => {
   const file = 'b.txt';
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
       gzip: true,
-      baseDir,
       autoIndex: true,
       showDir: true,
       weakEtags: false,
       weakCompare: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
@@ -174,14 +172,13 @@ test('304_not_modified_weak_compare', (t) => {
   const file = 'c.js';
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
       gzip: true,
-      baseDir,
       autoIndex: true,
       showDir: true,
       weakEtags: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
diff --git a/test/core-error.js b/test/core-error.js
index a063c76..026fe9e 100644
--- a/test/core-error.js
+++ b/test/core-error.js
@@ -2,13 +2,14 @@
 
 const test = require('tap').test;
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const mkdirp = require('mkdirp');
 const path = require('path');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 mkdirp.sync(`${root}/emptyDir`);
 
@@ -19,14 +20,13 @@ test('core', (t) => {
   const port = Math.floor((Math.random() * ((1 << 16) - 1e4)) + 1e4);
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
       gzip: true,
-      baseDir,
       autoIndex: true,
       showDir: true,
       handleError: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
diff --git a/test/core.js b/test/core.js
index 5e5400a..f85d336 100644
--- a/test/core.js
+++ b/test/core.js
@@ -2,6 +2,7 @@
 
 const test = require('tap').test;
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const mkdirp = require('mkdirp');
@@ -9,7 +10,7 @@ const path = require('path');
 const eol = require('eol');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 mkdirp.sync(`${root}/emptyDir`);
 
@@ -20,15 +21,14 @@ test('core', (t) => {
   const port = Math.floor((Math.random() * ((1 << 16) - 1e4)) + 1e4);
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
       gzip: true,
-      baseDir,
       autoIndex: true,
       showDir: true,
       defaultExt: 'html',
       handleError: true,
-    })
+    }))
   );
 
   server.listen(port, () => {
diff --git a/test/express-error.js b/test/express-error.js
index 2daa216..90261ed 100644
--- a/test/express-error.js
+++ b/test/express-error.js
@@ -9,7 +9,7 @@ const mkdirp = require('mkdirp');
 const path = require('path');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 mkdirp.sync(`${root}/emptyDir`);
 
@@ -21,10 +21,9 @@ test('express', (t) => {
 
   const app = express();
 
-  app.use(ecstatic({
+  app.use(baseDir, ecstatic({
     root,
     gzip: true,
-    baseDir,
     autoIndex: true,
     showDir: true,
     cache: 'no-cache',
diff --git a/test/express.js b/test/express.js
index 89775d9..51bffed 100644
--- a/test/express.js
+++ b/test/express.js
@@ -10,7 +10,7 @@ const path = require('path');
 const eol = require('eol');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 mkdirp.sync(`${root}/emptyDir`);
 
@@ -22,10 +22,9 @@ test('express', (t) => {
 
   const app = express();
 
-  app.use(ecstatic({
+  app.use(baseDir, ecstatic({
     root,
     gzip: true,
-    baseDir,
     autoIndex: true,
     showDir: true,
     defaultExt: 'html',
diff --git a/test/showdir-href-encoding.js b/test/showdir-href-encoding.js
index d327859..15df3ea 100644
--- a/test/showdir-href-encoding.js
+++ b/test/showdir-href-encoding.js
@@ -2,24 +2,24 @@
 
 const test = require('tap').test;
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const path = require('path');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 test('url encoding in href', (t) => {
   const port = Math.floor((Math.random() * ((1 << 16) - 1e4)) + 1e4);
   const uri = `http://localhost:${port}${path.join('/', baseDir, 'show-dir%24%24href_encoding%24%24')}`;
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
-      baseDir,
       showDir: true,
       autoIndex: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
diff --git a/test/showdir-pathname-encoding.js b/test/showdir-pathname-encoding.js
index 227a9c4..d59b39c 100644
--- a/test/showdir-pathname-encoding.js
+++ b/test/showdir-pathname-encoding.js
@@ -2,6 +2,7 @@
 
 const tap = require('tap');
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const path = require('path');
@@ -9,7 +10,7 @@ const path = require('path');
 const test = tap.test;
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 if (process.platform === 'win32') {
   tap.plan(0, 'Windows is allergic to < in path names');
@@ -29,12 +30,11 @@ test('directory listing with pathname including HTML characters', (t) => {
   const uri = `http://localhost:${port}${path.join('/', baseDir, '/%3Cdir%3E')}`;
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
-      baseDir,
       showDir: true,
       autoIndex: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
diff --git a/test/showdir-search-encoding.js b/test/showdir-search-encoding.js
index ed6a0c6..2b81ce9 100644
--- a/test/showdir-search-encoding.js
+++ b/test/showdir-search-encoding.js
@@ -2,24 +2,24 @@
 
 const test = require('tap').test;
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const path = require('path');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 test('directory listing with query string specified', (t) => {
   const port = Math.floor((Math.random() * ((1 << 16) - 1e4)) + 1e4);
   const uri = `http://localhost:${port}${path.join('/', baseDir, '?a=1&b=2')}`;
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
-      baseDir,
       showDir: true,
       autoIndex: false,
-    })
+    }))
   );
 
   server.listen(port, () => {
diff --git a/test/showdir-with-spaces.js b/test/showdir-with-spaces.js
index fdee160..3e1c3ac 100644
--- a/test/showdir-with-spaces.js
+++ b/test/showdir-with-spaces.js
@@ -2,24 +2,24 @@
 
 const test = require('tap').test;
 const ecstatic = require('../lib/ecstatic');
+const express = require('express');
 const http = require('http');
 const request = require('request');
 const path = require('path');
 
 const root = `${__dirname}/public`;
-const baseDir = 'base';
+const baseDir = '/base';
 
 test('directory listing when directory name contains spaces', (t) => {
   const port = Math.floor((Math.random() * ((1 << 16) - 1e4)) + 1e4);
   const uri = `http://localhost:${port}${path.join('/', baseDir, 'subdir_with%20space')}`;
 
   const server = http.createServer(
-    ecstatic({
+    express().use(baseDir, ecstatic({
       root,
-      baseDir,
       showDir: true,
       autoIndex: false,
-    })
+    }))
   );
 
   server.listen(port, () => {