Use 200.html as a fallback before 404.html

lib/ecstatic.js

@@ -124,13 +124,26 @@ var ecstatic = module.exports = function (dir, options) {
               url: parsed.pathname + '.' + defaultExt + ((parsed.search)? parsed.search:'')
             }, res, next);
           }
-          else {
-            // Try to serve default ./404.html
+          else if (!handleError) {
+            // If we're not handling errors/fallbacks, bail out now
+            middleware({
+              url: req.url,
+              statusCode: 404
+            }, res, next);
+          }
+          else if (path.basename(parsed.pathname, defaultExt) === '200.') {
+            // Already tried ./200.html, now try ./404.html
             middleware({
-              url: (handleError ? ('/' + path.join(baseDir, '404.' + defaultExt)) : req.url),
+              url: '/' + path.join(baseDir, '404.' + defaultExt),
               statusCode: 404
             }, res, next);
           }
+          else {
+            // Try ./200.html before falling back to ./404.html
+            middleware({
+              url: '/' + path.join(baseDir, '200.' + defaultExt),
+            }, res, next);
+          }
         }
         else if (err) {
           status[500](res, next, { error: err });

test/fallback-200.js

@@ -0,0 +1,29 @@
+var test = require('tap').test,
+    ecstatic = require('../'),
+    http = require('http'),
+    request = require('request'),
+    eol = require('eol');
+
+function runTest(path, expectedBody) {
+  return function (t) {
+    t.plan(3);
+    var server = http.createServer(ecstatic(__dirname + '/public/containsFallback'));
+
+    server.listen(0, function () {
+      var port = server.address().port;
+      request.get('http://localhost:' + port + path, function (err, res, body) {
+        t.ifError(err);
+        t.equal(res.statusCode, 200);
+        t.equal(eol.lf(body), expectedBody);
+        server.close(function() { t.end(); });
+      });
+    });
+  };
+}
+
+test('fallback showsIndex', runTest('/', 'index!!!\n'));
+test('fallback showsNonIndex', runTest('/pageTwo.html', 'pageTwo!!!\n'));
+test('fallback showsSubDir', runTest('/subdir', 'subdir index!!!\n'));
+test('fallback fallsBack 1', runTest('/something', '200.html fallback!!!\n'));
+test('fallback fallsBack 2', runTest('/else.html', '200.html fallback!!!\n'));
+test('fallback fallsBack 3', runTest('/with/multiple/paths', '200.html fallback!!!\n'));

test/public/containsFallback/200.html

@@ -0,0 +1 @@
+200.html fallback!!!

test/public/containsFallback/index.html

@@ -0,0 +1 @@
+index!!!

test/public/containsFallback/pageTwo.html

@@ -0,0 +1 @@
+pageTwo!!!

test/public/containsFallback/subdir/index.html

@@ -0,0 +1 @@
+subdir index!!!