test-nginx: assert x-forwarded-proto header is always https (#742)

test/mock-http-server/index.js

@@ -14,6 +14,8 @@ app.get('/reset',       withStdLogging((req, res) => {
   res.json('OK');
 }));
 
+app.get('/v1/reflect-headers', withStdLogging((req, res) => res.json(req.headers)));
+
 app.get('/*', ok('GET'));
 app.post('/*', ok('POST'));
 // TODO add more methods as required

test/test-nginx.js

@@ -96,6 +96,34 @@ describe('nginx config', () => {
       { method:'GET', path:'/v1/some/central-backend/path' },
     );
   });
+
+  it('should set x-forwarded-proto header to "https"', async () => {
+    // when
+    const res = await fetch(`https://localhost:9001/v1/reflect-headers`);
+    // then
+    assert.equal(res.status, 200);
+
+    // when
+    const body = await res.json();
+    // then
+    assert.equal(body['x-forwarded-proto'], 'https');
+  });
+
+  it('should override supplied x-forwarded-proto header', async () => {
+    // when
+    const res = await fetch(`https://localhost:9001/v1/reflect-headers`, {
+      headers: {
+        'x-forwarded-proto': 'http',
+      },
+    });
+    // then
+    assert.equal(res.status, 200);
+
+    // when
+    const body = await res.json();
+    // then
+    assert.equal(body['x-forwarded-proto'], 'https');
+  });
 });
 
 function fetchHttp(path, options) {