diff --git a/lib/get-file-path-from-url.js b/lib/get-file-path-from-url.js
index 22dc157..8d9f28d 100644
--- a/lib/get-file-path-from-url.js
+++ b/lib/get-file-path-from-url.js
@@ -1,4 +1,5 @@
 const path = require('path');
+const fs = require('fs');
 
 /**
  * Safely get the path for a file in the project directory, or reject by returning "dummy"
@@ -33,7 +34,21 @@ function getFilePathFromUrl(url, basePath, { pathLib = path, baseHref = '' } = {
     }
   }
 
-  const absolutePath = pathLib.join(basePath, relativePath);
+  let absolutePath = pathLib.join(basePath, relativePath);
+  if ( absolutePath.endsWith(pathLib.sep) ) {
+    // By convention, accessing a path routes to a default document in
+    // that directory if it exists.
+    // Commonly used default documents.
+    const defaultDocs = [ "index.html", "index.htm", "index.php" ];
+    // See if one of these exists.
+    for ( let d of defaultDocs ) {
+      if ( fs.existsSync( absolutePath + d ) ) {
+        absolutePath += d;
+        break;
+      }
+    }
+  }
+
   if (
     !absolutePath.startsWith(basePath) || // if the path has broken out of the basePath, it should be rejected
     absolutePath.endsWith(pathLib.sep) // only files (not folders) can be served