Is there a straightforward way to add a header using middleware?

[ahjulstad]

I think I need to set CORS headers on all responses, and not only pre-flight requests. I could of course have my main handlers return a HTTP.Response with appropriate headers and body (instead of just the Dict), but this is not the right way, probably.

What would be the best way to add headers using middleware? I see the pre-flight example in the docs, which is all nice, but perhaps a bit too complicated as an initial example.

I attempted this (which seems to work):

function addCORSheader(handler)
    function(req::HTTP.Request)
        function wrap(response::HTTP.Response)
            push!(response.headers, CORS_HEADERS)
            response
        end
        return wrap(handler(req))
    end
end

@get "/dummy" function()
    return HTTP.Response(200, CORS_HEADERS, "Test")
end

@get router("/dummy2", middleware=[addCORSheader]) function()
    "Test"
end

but it feels a bit convoluted.

I believe a simple example in the documentation would help (at least it would have helped me).

[ndortega]

Hi @ahjulstad,

In your specific use case, I'd recommend setting your middleware function at the application level. Any middleware defined at the application level intercepts all incoming requests and outgoing responses.

serve(middleware=[addCORSheader])