Serving swagger-ui with the API Server

Use-Case: I was trying to serve swagger-ui from the generated API Server and I didn't find a straightforward enough way in the docs, so I've created my own swagger-ui middleware:

func setupGlobalMiddleware(handler http.Handler) http.Handler {
    return uiMiddleware(handler)

func uiMiddleware(handler http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        // Shortcut helpers for swagger-ui
        if r.URL.Path == "/swagger-ui" || r.URL.Path == "/api/help" {
            http.Redirect(w, r, "/swagger-ui/", http.StatusFound)
        // Serving ./swagger-ui/
        if strings.Index(r.URL.Path, "/swagger-ui/") == 0 {
            http.StripPrefix("/swagger-ui/", http.FileServer(http.Dir("swagger-ui"))).ServeHTTP(w, r)
        handler.ServeHTTP(w, r)

Can this be achieved any easier?

Answer: I think that's the way to do it.

At some point I included an embedded version of the swagger-ui in this toolkit but it became annoying to keep up to date and severely bloated the size of my binary.

What do you say if we add swagger-ui as git submodule, include this middleware in your binary and update the docs?

I'm reluctant to do so at this point in time because a git submodule break go-gettability.

I've had it included at one point but it's so much of a moving target that it would always be outdated. On top of it it are a lot of javascript and html files and people haven't been over the moon when go-swagger gets vendored and they see all of that.

Originally from issue #370.

See also: How to serve Swagger UI from a preexisting web app? #1029.

How to serve Swagger UI from a preexisting web app?

Use-Case: Does go-swagger provide an http.HandlerFunc or other easy method for serving Swagger UI from a preexisting web app? I want my web app to expose /swagger-ui, without using code generation, and without hosting a separate server.

Answer: there are a few ways you can serve a UI.

Use the middleware provided in the go-openapi/runtime package:

Originally from issues #1029 and #976

How to use swagger-ui cors?

Answer: you can add a cors middleware.


Documentation on how to customize middleware

Working example (in configure_name.go):

import ""

func setupGlobalMiddleware(handler http.Handler) http.Handler {
    handleCORS := cors.Default().Handler
    return handleCORS(handler)

Originally from issue #481.

How to serve my UI files?

Use-Case: I generated server code using go-swagger with my swagger.yaml file like below.

$ swagger generate server --exclude-main -A myapp -t gen -f ./swagger.yaml

And I want to add new handler to serve my own UI files. In this case, is middleware only solution to serve UI files? Or can I add new handler to serve files without middleware?

// Handler example which I want to add to swagger server
func pastaWorkspacePage(w http.ResponseWriter, r *http.Request) {
    http.ServeFile(w, r, "./static/workspace.html")

I solved the problem using middleware.

func FileServerMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        if strings.HasPrefix(r.URL.Path, "/api") {
            next.ServeHTTP(w, r)
        } else {
            http.FileServer(http.Dir("./static")).ServeHTTP(w, r)

But I'm not sure it is the best solution.

Hint: more info on using middlewares is found here: That page also contains a link to a good explanation on how to create net/http middlewares.

An implementation example is provided by the go-swagger serve UI command. It constructs a server with a redoc middleware:

Besides, every swagger generated server comes with the redoc UI baked in at /{basepath}/docs

Originally from issue #1375.

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