Responses

Creating Responses

Strings & Slices

All routes and controllers should return a response to be sent back to the user's browser. Confetti provides several different ways to return responses. The most basic response is returning a string from a route or controller with function outcome.Html. The framework will automatically convert the string into a full HTTP response:

Get("/", func(_ inter.Request) inter.Response {
    return outcome.Html("Hello World")
}),

In addition to returning strings from your routes and controllers, you may also return slices with function outcome.Json. The framework will automatically convert the slice into a JSON response:

Get("/", func(_ inter.Request) inter.Response {
    return outcome.Json([]int{1,2,3})
}),

Did you know you can also return support.Collection and support.Map from your routes or controllers? They will automatically be converted to JSON. Give it a shot!

Response Objects

Functions outcome.Html, outcome.Json and outcome.Content return an object with interface inter.Response. That allows you to customize the response's HTTP status code and headers:

Get("home", func(_ inter.Request) inter.Response {
    return outcome.Html("Hello World").
        Status(200).
        Header("Content-Type", "text/plain")
}),

outcome.Html and outcome.Json will add a Content-Type header. Use outcome.Content to add Content-Type header yourself.

Attaching Headers To Responses

Keep in mind that most response methods are chainable, allowing for the fluent construction of response instances. For example, you may use the Header method to add a series of headers to the response before sending it back to the user:

return outcome.Content("# Cool Stuff").
    Header("Content-Type", "text/markdown", "charset=UTF-8").
    Header("X-Header-One", "Header Value")

Or, you may use the Headers method to specify a slice of headers to be added to the response:

return outcome.Content("# Cool Stuff").
    Headers(http.Header{
        "Content-Type": {"application/markdown", "charset=UTF-8"},
        "X-Header-One": {"Header Value"},
    })

Attaching Cookies To Responses

The Cookie method on response instances allows you to easily attach cookies to the response. For example, you may use the Cookie method to generate a cookie and fluently attach it to the response instance like so:

return outcome.Html("Hello World").
    Cookie(http.Cookie{Name: "request_id", Value: "aGdsf89hA3jr2"})

Redirects

Redirect responses are instances of the outcome.redirectResponse struct, and contain the proper headers needed to redirect the user to another URL. There are several ways to generate a outcome.redirectResponse instance. The simplest method is to use the outcome.RedirectPermanent or the outcome.RedirectTemporary function:

    Get("dashboard", func(_ inter.Request) inter.Response {
        return outcome.RedirectPermanent("home/dashboard")
    }),

    Get("login", func(_ inter.Request) inter.Response {
        return outcome.RedirectTemporary("under_construction")
    }),

Or you can use outcome.Redirect to determine the HTTP status yourself.

outcome.Redirect("home/dashboard", net.StatusPermanentRedirect)

Redirecting To External Domains

Sometimes you may need to redirect to a domain outside of your application. Even then you can use the above methods:

return outcome.RedirectTemporary("https://github.com/confetti-framework")

Redirecting To Named Routes

When you call the outcome.RedirectToRoute function with the route name, the user will be redirected to that route.

return outcome.RedirectToRoute(request.App(), "login")

If your route has parameters, you may pass them as an extra argument to the method:

// For a route with the following URI: profile/{id}

return outcome.RedirectToRoute(request.App(), "profile", outcome.Parameters{"id": 12})

Redirecting To Controller Actions

You may also redirect the request to controller actions. To do so, simply call the controller:

return controllers.Homepage(request)

Other Response Types

The outcome package may be used to generate other types of response instances. The outcome package provides several helpful function for generating responses.

JSON Responses

The outcome.Json method will automatically set the Content-Type header to application/json, as well as convert the given object to JSON using json.Marshal:

return outcome.Json(map[string]string{
    "name": "abigail",
    "state": "CA",
})

View Responses

If you need control over the response's status and headers but also need to return a view as the response's content, you can use the outcome.Html method with a created view:

return outcome.Html(views.Homepage("James")).Status(200)

File Downloads

Function Download may be used to generate a response that forces the user's browser to download the file at the given path. The response of the Download method accepts the method Filename, which will determine the file name that is seen by the user downloading the file. Content-Type with MIME type is automatically filled in based on the file extension.

return outcome.Download(filePath)

return outcome.Download(filePath).Filename("label.pdf")

The file may not be found. Instead of a panic, DownloadE allows you to choose to handle your errors with more love.

response, err := outcome.DownloadE(filePath)
if err != nil {
    return err.Level(log_level.NOTICE)
}

The file being downloaded need to have an ASCII file name.

Streamed Downloads

Sometimes you may wish to turn the string response of a given operation into a downloadable response without having to write the contents of the operation to disk. You may use the Content function in this scenario:

return outcome.Content("%PDF-1.5").
    Header("Content-Type", "application/pdf").
    FileName("labels.pdf")

Show In Browser

Function ShowInBrowser may be used to display a file, such as an image or PDF, directly in the user's browser instead of initiating a download:

return outcome.Content("%PDF-1.5").
    Header("Content-Type", "application/pdf").
    ShowInBrowser()