response.Body() cant‘run in the page.OnResponse(HandleResponse) callback function

[xiaoyaochen]

when use response.Body() in the page.OnResponse(HandleResponse) callback function, it will be stop running
like this:

package main

import (
	"fmt"

	"github.com/playwright-community/playwright-go"
)

func HandleResponse(response playwright.Response) {
	fmt.Println(response.URL())
	body, err := response.Body()
	if err == nil {
		fmt.Println(body)
	}
}

func main() {
	pw, _ := playwright.Run()
	browser, _ := pw.Chromium.Launch(playwright.BrowserTypeLaunchOptions{
		Headless: playwright.Bool(true),
	})
	context, _ := browser.NewContext()
	page, _ := context.NewPage()
	page.OnResponse(HandleResponse)
	_, err := page.Goto("https://github.com/")
	if err != nil {
		fmt.Printf(err.Error())
	}
	defer func() {
		page.Close()
		browser.Close()
		pw.Stop()
	}()
}

[canstand]

Please provide verified reproducible code in markdown code block format.

[xiaoyaochen]

package main

import (
	"fmt"

	"github.com/playwright-community/playwright-go"
)

func HandleResponse(response playwright.Response) {
	fmt.Println(response.URL())
	body, err := response.Body()
	if err == nil {
		fmt.Println(body)
	}
}

func main() {
	pw, _ := playwright.Run()
	browser, _ := pw.Chromium.Launch(playwright.BrowserTypeLaunchOptions{
		Headless: playwright.Bool(true),
	})
	context, _ := browser.NewContext()
	page, _ := context.NewPage()
	page.OnResponse(HandleResponse)
	_, err := page.Goto("https://github.com/")
	if err != nil {
		fmt.Printf(err.Error())
	}
	defer func() {
		page.Close()
		browser.Close()
		pw.Stop()
	}()
}

[canstand]

pls use goroutine to get response body for now:

func HandleResponse(response playwright.Response) {
	go func() {
		fmt.Println(response.URL())
		body, err := response.Body()
		if err == nil {
			fmt.Println(body)
		}
	}()
}

[roku-on-it]

Why the event listener handle is blocking inside OnResponse's context? I'm just curious because Page struct has an embedded EventEmitter member if I'm not wrong. It looks similar to how it's defined in Node version since Page extends EventEmitter.

Naturally, I expected this to be handled how it's handled in Node.

Please correct me if I'm wrong, but shouldn't handlers run in a Go routine by default to make them non-blocking?

[canstand]

Playwright-go only uses a synchronized EventEmitter. Otherwise there is a lot of data race and event synchronization to deal with.