sourceafBedSheet::Redirect.fan

** Return from request handler methods to send a redirect 3xx status to the client. Handles the 
** differences in HTTP 1.0 and HTTP 1.1. 
** 
** @see
**  - `http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#3xx_Redirection`
**  - `http://www.iana.org/assignments/http-status-codes/http-status-codes.xml`
const final class Redirect {
    
    ** The URI to redirect to
    const Uri uri

    internal const RedirectType type

    private new make(Uri redirectTo, RedirectType type) {
        this.uri = redirectTo
        this.type = type
    }

    ** Sends a 'Moved Permanently' response to the client with the following status codes:
    **  - 301 for HTTP 1.0 
    **  - 308 for HTTP 1.1
    ** 
    ** The client should use the same HTTP method when requesting the redirect.
    ** 
    ** Note: Until Fantom 1.0.66 is released, 301 is also set for HTTP 1.1.
    ** 
    ** @see `http://fantom.org/sidewalk/topic/2169#c14003`
    // FIXME: Fantom-1.0.66 - use http status 308 
    static new movedPermanently(Uri redirectTo) {
        Redirect.make(redirectTo, RedirectType.movedPermanently)
    }

    ** Sends a 'Moved Temporarily' response to the client with the following status codes:
    **  - 302 for HTTP 1.0 
    **  - 307 for HTTP 1.1
    ** 
    ** The client should use the same HTTP method when requesting the redirect.
    static new movedTemporarily(Uri redirectTo) {
        Redirect.make(redirectTo, RedirectType.movedTemporarily)
    }

    ** Use when the client should perform a HTTP GET on the returned uri. Typically this is 
    ** when the app subscribes to the 'Redirect After Post' paradigm. 
    **  - 302 for HTTP 1.0 
    **  - 303 for HTTP 1.1
    static new afterPost(Uri redirectTo) {
        Redirect.make(redirectTo, RedirectType.afterPost)
    }
    
    override Str toStr() {
        "Redirect -> ${uri} (${type.toStr.toDisplayName})"
    }
}

** the order is important - see `RedirectResponseProcessor`
internal enum class RedirectType {
    movedPermanently,
    movedTemporarily,
    afterPost;
}