Nancy navigation to URL without trailing slash?

Question

We are using Nancy framework for our application which is self-hosted in console application. The problem appears when loading the URL without trailing slash.

Let's say we are hosting the page in

http://host.com:8081/module/

It then serves us am html page which has resources with a relative path like this:

content/scripts.js

Everything works well when you enter a url such as

// Generates a resource url 'http://host.com:8081/module/content/scripts.js' 
// which is good
http://host.com:8081/module/

But when we leave out a trailing slash, the resource url is

// Generates a resource url 'http://host.com:8081/content/scripts.js' 
// which is bad
http://host.com:8081/module

Is there any way to make redirection to trailing slash version? Or at least detect if trailing slash exists or not.

Thanks!

You could probably hook into the Before application pipeline and add the trailing slash or do theredirecct — Christian Horsdal, Nov 11 '14 at 09:56
Hooking to the Before doesn't work because I get the same URL when accessing URL with or without trailing slash. I can't detect when trailing slash is missing and when do the redirect. — Drasius, Nov 11 '14 at 10:34
If I create two routes, `Get["/module"]` and `Get["/module/"]`, then requests for both _/module_ and _/module/_ get handled by the `Get["/module/"]` route - so there appears to be no way to distinguish between them? — rogersillito, Dec 04 '15 at 14:35

score 0 · Accepted Answer · edited May 23 '17 at 11:59

This feels a bit hacky but it works:

Get["/module/"] = o =>
{
    if (!Context.Request.Url.Path.EndsWith("/"))
        return Response.AsRedirect("/module/" + Context.Request.Url.Query, RedirectResponse.RedirectType.Permanent);
    return View["module"];
};

The Request accessible from Context lets you see whether the path has the trailing slash or not and redirect to a 'slashed' version. I wrapped this up as an extension method (which works for my very simple use case):

public static class NancyModuleExtensions
{
    public static void NewGetRouteForceTrailingSlash(this NancyModule module, string routeName)
    {
        var routeUrl = string.Concat("/", routeName, "/");
        module.Get[routeUrl] = o =>
        {
            if (!module.Context.Request.Url.Path.EndsWith("/"))
                return module.Response.AsRedirect(routeUrl + module.Request.Url.Query, RedirectResponse.RedirectType.Permanent);
            return module.View[routeName];
        };
    }
}

To use in a module:

// returns view "module" to client at "/module/" location
// for either "/module/" or "/module" requests
this.NewGetRouteForceTrailingSlash("module");

This is worth reading though before going with a solution such as this

Nancy navigation to URL without trailing slash?

1 Answers1