Weird Windows 7 issue

One of our customers complained that out site is not loading fully. It turned out that in the response from the server all <script> tags and their contents were removed. We use javascript heavily. She is using Windows 7 and the site was working before.

She told the site stopped working after some Windows 7 updates. But nothing suspicious in the update history. The site is not working in all browsers like IE开发者_开发技巧,FF and Chrome. But other sites were working and their scripts were loaded properly.

After spending lot of time trying various things I changed the protocol from http to https.(Don't ask me why). Then it started working!!!. I couldn't understand what the issue is. Is there some firewall or third-party software that strips the script tags (or in someway modify) the http response?

Sounds like a case of having a proxy modify your page requests. I would suggest checking security software (i.e. Norton, McAfee, SiteAdvisor, that inject and remove stuff etc) to see if they are modifying pages or if a corporate intranet firewall is modifying, since HTTPS is encrypted end-to-end and cannot be modified.