added prop when thumbnail is shown for a document so componentView can choose not to render. fixed pdf views to not generate gray box when first transitioning from thumb to live view.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/server/server_Initialization.ts b/src/server/server_Initialization.ts
index a10cd4983..24cc3b796 100644
--- a/src/server/server_Initialization.ts
+++ b/src/server/server_Initialization.ts
@@ -100,7 +100,7 @@ function buildWithMiddleware(server: express.Express) {
         passport.session(),
         (req: express.Request, res: express.Response, next: express.NextFunction) => {
             res.locals.user = req.user;
-            if ((req.originalUrl.endsWith(".png") /*|| req.originalUrl.endsWith(".js")*/) && req.method === 'GET') {
+            if ((req.originalUrl.endsWith(".png") /*|| req.originalUrl.endsWith(".js")*/) && req.method === 'GET' && (res as any)._contentLength) {
                 const period = 30000;
                 res.set('Cache-control', `public, max-age=${period}`);
             } else {