Web worker won't start in IE unless the cache is cleared

Question

I\'m having a really weird bug in my HTML5 script. I wrote a sharepoint app completely in OData which uses a few HTML 5 webworker to do the number crunching in the background. T

Answer 1

using a time based querystring parameter prevents caching showing http status 200 on each refresh. tested on latest chrome, ie, ff;

var opus = new Worker("worker.js?q=" + new Date().getTime().toString() );

to be honest this a long shot as i do not have sharepoint right now

Answer 2

SharePoint sends the header:

Content-Disposition: attachment; filename="xyz.js"
X-Download-Options:  noopen

and the IE Web Worker Implantation then does not run this web worker. (Tested in IE11) In the IE Network Monitor the request still on pending, even the Response text is visible.

I know so fare two workarounds:

1. Place the web worker js in the layouts folder (needs a Farm Solution, with the downside of this)
2. Set the Browser File Handling for the Web application to Permissive (maybe your security is not amused)