First thing we need to understand is whether such failures occur due to my code, file format or server configuration.
let’s have a simple check trying to access the file directly using our browser.
configure your IIS to serve the following files: swf and mp4 using Static Content
<add name="FlashFiles" path="*.swf" verb="*" modules="StaticFileModule" scriptProcessor="" resourceType="File" requireAccess="Script" />
<add name="VideoFiles" path="*.mp4" verb="*" modules="StaticFileModule" scriptProcessor="" resourceType="File" requireAccess="Script" />
Setting handler(s) won’t be good enough, requesting the server again will return “404.3 – mime type missing”.
Don’t worry Adding new mime type to IIS 7 - is easy:
<mimeMap fileExtension=".mp4" mimeType="video/mp4" />
While installing the static content on our static servers (apache) – we’ve found out that requesting the files from firefox return with “no content length” and “incorrect mime type”
adding the correct mime type to the /etc/mime.type
Check the Request\Response we’ve found out that our servers are still returning compressed response , googling it find out that Firefox cann’t handle gzipped video stream,
compression was selectively disabled by adding the following line to /etc/httpd/conf.d/static.d/static.conf:
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|mp4)$ no-gzip dont-vary
Apache solution provided by Tomer G.