How to define HTTP headers to 'always' be returned?

[etnt]

Hi folks, Let's say I want to always return a 'Origin:' header (see: http://www.w3.org/TR/cors/). How can I do that? For an appmod, or yaws-page that is easy, but how about index.html or Javascript files being served? Perhaps a server-config <header>Origin: http://example.com </header> could work?

Cheers, Tobbe

[vinoski]

Hey Tobbe, how's it going? I think an appmod registered for "/" that returned

{page, {[{header, {"Origin", "http://example.com"}}], OriginalUrl}}.

can do this. More completely:

out(Arg) ->
    Req = Arg#arg.req,
    {abs_path, Path} = Req#http_request.path,
    {page, {[{header, {"X-Extra-Header", "testing testing"}}], Path}}.

There are drawbacks to this, of course, which is that this code doesn't handle query parameters (though it could), and that the extra header is included in the response even if the result is a 404 or other error.

Still, adding some sort of config option wouldn't be a bad idea. Adding a URI matching capability for this would be handy, something along the lines of "if you see a URI matching this pattern add these headers to the response."

[etnt]

Yes, an appmod for '/' would do it. But I guess it would hijack the whole URI namespace, which wouldn't be acceptable in most cases I suspect, or?

So some sort of config option could be good in this case.

[klacke]

I know of no good ways to to this, it'll require some hackery.