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Example of using chromedp to prerender a create-react-app frontend using fake SSR via chrome headless
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| package main | |
| import ( | |
| "context" | |
| "io/ioutil" | |
| "log" | |
| "strings" | |
| "testing" | |
| "github.com/chromedp/cdproto/dom" | |
| "github.com/chromedp/chromedp" | |
| ) | |
| func TestSSRofCRA(t *testing.T) { | |
| // create context, this would come from client if using HTTP | |
| ctx, cancel := chromedp.NewContext(context.Background()) | |
| defer cancel() | |
| // create-react-app uses port 3000 by default | |
| var res string | |
| err := chromedp.Run(ctx, scrapIt("http://localhost:3000/", &res)) | |
| if err != nil { | |
| t.Fatal(err) | |
| } | |
| ioutil.WriteFile("rendered.html", []byte(res), 0664) | |
| log.Println(strings.TrimSpace(res)) | |
| } | |
| func scrapIt(url string, str *string) chromedp.Tasks { | |
| return chromedp.Tasks{ | |
| chromedp.Navigate(url), | |
| chromedp.ActionFunc(func(ctx context.Context) error { | |
| node, err := dom.GetDocument().Do(ctx) | |
| if err != nil { | |
| return err | |
| } | |
| *str, err = dom.GetOuterHTML().WithNodeID(node.NodeID).Do(ctx) | |
| return err | |
| }), | |
| } | |
| } | |
| // Alternative, less-stable fetch using chrome directly | |
| // out, err := exec.Command("sh", "-c", "/root/tools/chromium-latest-linux/latest/chrome --headless --no-sandbox --dump-dom "+url).Output() | |
| // if err != nil { | |
| // log.Fatal(err) | |
| // } | |
| // fmt.Printf("%s\n", out) |
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