chromedp - get response headers

main.go

// https://stackoverflow.com/a/56602780

package main

import (
    "context"
    "io/ioutil"
    "log"
    "os"
    "time"

    "github.com/chromedp/cdproto/network"
    "github.com/chromedp/chromedp"
)

func main() {
    dir, err := ioutil.TempDir("", "chromedp-example")
    if err != nil {
        panic(err)
    }
    defer os.RemoveAll(dir)

    opts := append(chromedp.DefaultExecAllocatorOptions[:],
        chromedp.DisableGPU,
        chromedp.NoDefaultBrowserCheck,
        chromedp.Flag("headless", false),
        chromedp.Flag("ignore-certificate-errors", true),
        chromedp.Flag("window-size", "50,400"),
        chromedp.UserDataDir(dir),
    )

    allocCtx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
    defer cancel()

    // also set up a custom logger
    taskCtx, cancel := chromedp.NewContext(allocCtx, chromedp.WithLogf(log.Printf))
    defer cancel()

    // create a timeout
    taskCtx, cancel = context.WithTimeout(taskCtx, 10*time.Second)
    defer cancel()

    // ensure that the browser process is started
    if err := chromedp.Run(taskCtx); err != nil {
        panic(err)
    }

    // listen network event
    listenForNetworkEvent(taskCtx)

    chromedp.Run(taskCtx,
        network.Enable(),
        chromedp.Navigate(`http://www.google.com`),
        chromedp.WaitVisible(`body`, chromedp.BySearch),
    )

}

func listenForNetworkEvent(ctx context.Context) {
    chromedp.ListenTarget(ctx, func(ev interface{}) {
        switch ev := ev.(type) {

        case *network.EventResponseReceived:
            resp := ev.Response
            if len(resp.Headers) != 0 {
                log.Printf("received headers: %s", resp.Headers)

            }

        }
        // other needed network Event
    })
}