// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package browser

import (
	"fmt"
	"strconv"
	"sync"

	"github.com/minio/minio/internal/config"
	"github.com/minio/pkg/v3/env"
)

// Browser sub-system constants
const (
	// browserCSPPolicy setting name for Content-Security-Policy response header value
	browserCSPPolicy = "csp_policy"

nput[disabled] ~ .custom-file-label,\n.custom-file-input:disabled ~ .custom-file-label {\n  background-color: #e9ecef;\n}\n\n.custom-file-input:lang(en) ~ .custom-file-label::after {\n  content: \"Browse\";\n}\n\n.custom-file-input ~ .custom-file-label[data-browse]::after {\n  content: attr(data-browse);\n}\n\n.custom-file-label {\n  position: absolute;\n  top: 0;\n  right: 0;\n  left: 0;\n  z-index: 1;\n  height: calc(1.5em + 0.75rem + 2px);\n  padding: 0.375rem 0.75rem;\n  overflow: hidden;\n ...

0bdff;box-shadow:none}.custom-file-input:disabled~.custom-file-label,.custom-file-input[disabled]~.custom-file-label{background-color:#e9ecef}.custom-file-input:lang(en)~.custom-file-label::after{content:"Browse"}.custom-file-input~.custom-file-label[data-browse]::after{content:attr(data-browse)}.custom-file-label{position:absolute;top:0;right:0;left:0;z-index:1;height:calc(2.25rem + 2px);padding:.375rem .75rem;overflow:hidden;font-weight:400;line-height:1.5;color:#495057;background-color:#fff;border:1px...

## Steps { #steps }

So, let's say you have a frontend running in your browser at `http://localhost:8080`, and its JavaScript is trying to communicate with a backend running at `http://localhost` (because we don't specify a port, the browser will assume the default port `80`).

    /**
     * Enumeration of supported browser types for user agent detection.
     * Each type represents a major browser family that can be detected
     * from the User-Agent header string.
     */
    public enum UserAgentType {
        /** Internet Explorer and Trident-based browsers */
        IE,
        /** Mozilla Firefox browser */
        FIREFOX,
        /** Google Chrome browser */
        CHROME,

```
http://localhost:8000/v1/agents/multivac
```

Even though the host of the malicious website and the local app is different, the browser won't trigger a CORS preflight request because:

* It's running without any authentication, it doesn't have to send any credentials.
* The browser thinks it's not sending JSON (because of the missing `Content-Type` header).

`data` und `raw_data` schließen sich gegenseitig aus. Sie können pro `ServerSentEvent` nur eines von beiden setzen.

///

## Mit `Last-Event-ID` fortsetzen { #resuming-with-last-event-id }

Wenn ein Browser nach einem Verbindungsabbruch erneut verbindet, sendet er die zuletzt empfangene `id` im Header `Last-Event-ID`.

Sie können ihn als Header-Parameter einlesen und verwenden, um den Stream dort fortzusetzen, wo der Client aufgehört hat:

/// note

`data` and `raw_data` are mutually exclusive. You can only set one of them on each `ServerSentEvent`.

///

## Resuming with `Last-Event-ID` { #resuming-with-last-event-id }

When a browser reconnects after a connection drop, it sends the last received `id` in the `Last-Event-ID` header.

You can read it as a header parameter and use it to resume the stream from where the client left off:

def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    browser = playwright.chromium.launch(headless=False)
    context = browser.new_context()
    page = context.new_page()
    page.goto("http://localhost:8000/docs")

# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()
    page.goto("http://localhost:8000/docs")