fix: don't return 304 status code for HEAD requests

src/handlers/strategies/serveFile.ts

@@ -14,6 +14,11 @@ import responses from '../../commonResponses';
  * @returns Http status code
  */
 function getStatusCode(request: Request, objectHasBody: boolean): number {
+  // Don't return 304 for HEAD requests
+  if (request.method === 'HEAD') {
+    return 200;
+  }
+
   if (objectHasBody) {
     if (request.headers.has('range')) {
       // Range header was sent, this is
@@ -33,7 +38,7 @@ function getStatusCode(request: Request, objectHasBody: boolean): number {
     return 412;
   }
 
-  // We weren't given a body
+  // We weren't given a body and preconditions succeeded
   return 304;
 }
 

tests/e2e/directory.test.ts

@@ -96,6 +96,16 @@ describe('Directory Tests (Restricted Directory Listing)', () => {
     assert.strictEqual(res.status, 200);
   });
 
+  it('allows HEAD `/dist` and returns no body', async () => {
+    const res = await mf.dispatchFetch(`${url}dist/`, {
+      method: 'HEAD',
+    });
+    assert.strictEqual(res.status, 200);
+
+    const body = await res.text();
+    assert.strictEqual(body.length, 0);
+  });
+
   it('redirects `/download` to `/download/`', async () => {
     const originalRes = await mf.dispatchFetch(`${url}download`, {
       redirect: 'manual',

tests/e2e/file.test.ts

@@ -37,6 +37,21 @@ describe('File Tests', () => {
     assert.strictEqual(body, `{ hello: 'world' }`);
   });
 
+  it('HEAD `/dist/index.json` returns no body and status code 200', async () => {
+    const res = await mf.dispatchFetch(`${url}dist/index.json`, {
+      method: 'HEAD',
+    });
+    assert.strictEqual(res.status, 200);
+    assert.strictEqual(res.headers.get('content-type'), 'application/json');
+    assert.strictEqual(res.headers.get('cache-control'), cacheControl);
+    assert.strictEqual(res.headers.has('etag'), true);
+    assert.strictEqual(res.headers.has('last-modified'), true);
+    assert.strictEqual(res.headers.has('content-type'), true);
+
+    const body = await res.text();
+    assert.strictEqual(body.length, 0);
+  });
+
   it('returns 404 for unknown file', async () => {
     const res = await mf.dispatchFetch(`${url}dist/asd123.json`);
     assert.strictEqual(res.status, 404);