Issue using wails asset handler with custom router
Question content
I'm trying to use a custom multiplexer with the wails asset handler, but when trying to get anything I keep getting index.html page. I added a print statement at the top of the muxer's servehttp function, but this is only called once when the favicon.ico is fetched at the beginning of the program.
I have the following main file:
package main
import (
"embed"
"fmt"
"github.com/nigel2392/router/v3"
"github.com/nigel2392/router/v3/request"
"github.com/wailsapp/wails/v2"
"github.com/wailsapp/wails/v2/pkg/options"
"github.com/wailsapp/wails/v2/pkg/options/assetserver"
)
var router *router.router = router.newrouter(true)
func init() {
router.get("/about", func(r *request.request) {
fmt.println("about")
r.writestring("about")
})
}
//go:embed all:frontend/dist
var assets embed.fs
func main() {
// create an instance of the app structure
app := newapp()
// create application with options
err := wails.run(&options.app{
title: "new",
width: 1024,
height: 768,
assetserver: &assetserver.options{
assets: assets,
handler: router,
},
backgroundcolour: &options.rgba{r: 27, g: 38, b: 54, a: 1},
onstartup: app.startup,
bind: []interface{}{
app,
},
})
if err != nil {
println("error:", err.error())
}
}
I can see the following output in the terminal:
deb | [externalassethandler] loading 'http://localhost:3000/favicon.ico' deb | [externalassethandler] loading 'http://localhost:3000/favicon.ico' failed, using assethandler # print statement at the top of the servehttp function, # prints the requested path, and the available router paths. path: /favicon.ico get /about -> deb | [externalassethandler] loading 'http://localhost:3000/about' to develop in the browser and call your bound go methods from javascript, navigate to: http://localhost:34115 deb | [externalassethandler] loading 'http://localhost:3000/@vite/client' deb | [externalassethandler] loading 'http://localhost:3000/node_modules/vite/dist/client/env.mjs' deb | [externalassethandler] loading 'http://localhost:3000/about' deb | [externalassethandler] loading 'http://localhost:3000/@vite/client' deb | [externalassethandler] loading 'http://localhost:3000/node_modules/vite/dist/client/env.mjs' deb | [externalassethandler] loading 'http://localhost:3000/about'
When trying to get the page in question for testing, as described in the wails assetserver documentation, I retrieve the index page:
let resp = await fetch("/about")
undefined
await resp.text()
'<!DOCTYPE html>\n<html lang="en">\n<head>\n \x3Cscript type="module" src="/@vite/client">\x3C/script>\n\n <meta charset="UTF-8"/>\n <meta content="width=device-width, initial-scale=1.0" name="viewport"/>\n <meta name="wails-options" content="noautoinject" />\n \x3Cscript src="/wails/ipc.js">\x3C/script>\n \x3Cscript src="/wails/runtime.js">\x3C/script>\n <title>new</title>\n</head>\n<body>\n <h1>Index!</h1>\n <a href="/about">Go To About!</a>\n</body>\n</html>\n'
Why is the servehttp function not called?
Solution
The log shows that externalassethandler is used. This means using an external front-end development server. All resource requests are first forwarded to the external front-end development server. The handler specified in assetserver.options will be used only when the external front-end development server responds with a 404 or 405 status code. Today, most spa front-end development servers serve index.html for non-asset requests. This is why you see this behavior.
The workaround is to configure the external front-end development server to bypass this request. For vite, modify the configuration file and add the following content:
export default defineConfig({
server: {
proxy: {
'/about': {
bypass: function () {
// Return false to produce a 404 error for the request.
return false;
},
},
// or for all the requests that start with "/api/"
'/api/': {
bypass: function () {
return false;
},
},
},
},
});But I recommend not to do this. Because the asset handler, as the name suggests, provides services for dynamic assets. wails has its own way of calling the bound go method . You should try it.
references:
frontend:dev:serverurlis located inwails.json- vite’s
server.proxyoptions - externalassethandler in
errskipproxy
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