[Bug]: XHR PUT FormData postData is null

[daniera3]

Version

latest

Steps to reproduce

cant get content of file uploaded

Expected behavior

get asdasdasd in post_data

Actual behavior

in pyptteer i can get this content with

    await cdp.send("Network.enable", {
        # Buffer up to 10 MB of POST/PUT data
        "maxPostDataSize": 0
    })
    async def on_request_will_be_sent(params):
        try:
            req = params["request"]
            if req.get("method") == "PUT" and "/api/file/raw" in req.get("url", ""):
                request_id = params["requestId"]
                # Ask Chrome: “Please give me the POST/PUT payload that you buffered.”
                resp = await cdp.send(
                    "Network.getRequestPostData",
                    {"requestId": request_id}
                )
                body = resp.get("postData", None)
                print("→ Caught PUT to /api/file/raw via Network:")
                print("   • request.postData →", body)
                # If you want bytes instead of a string, do:
                # raw_bytes = body.encode("utf-8")
                # print("   • as bytes:", raw_bytes)
        except Exception as e:
            # If "No post data available" still shows up, check that `maxPostDataSize` was set early enough.
            print("ERROR in on_request_will_be_sent:", e)

    cdp.on("Network.requestWillBeSent", lambda event: asyncio.create_task(on_request_will_be_sent(event)))

Additional context

No response

Environment

- Operating System: [Ubuntu 22.04]
- CPU: [arm64]
- Browser: [All, Chromium, Firefox, WebKit]
- Python Version: [3.12]
- Other info:

[mxschmitt]

Playwright supports this out of the box: https://playwright.dev/python/docs/api/class-request#request-post-data

def handle_request(request):
    print(">>", request.method, request.url)
    print(request.post_data)
page.on("request", handle_request)

[daniera3]

this not give me content .
request.post_data = empty string
or mutipart/data without content

[mxschmitt]

Would it be possible to share a repro?

[daniera3]

upload file "a.txt" and not see content but if use burp or pyppteer or other tool you will get content

import asyncio
from playwright.async_api import async_playwright
def handle_request(request):
    print(">>", request.method, request.url)
    print(request.post_data)


async def main():
    async with async_playwright() as p:
        browser = await p.chromium.launch(headless=False, channel="chrome")  # Set headless=False if you want to see the browser
        page = await browser.new_page()

        # Navigate to the login page
        await page.goto("https://brokencrystals.com/userlogin")

        # Fill in the email and password inputs
        await page.fill("#email", "admin")
        await page.fill("#password", "admin")

        # Click the submit button (assuming it’s a <button type="submit">)
        await page.click("button[type='submit']")

        # Optionally wait for navigation or some selector that appears after login
        await page.wait_for_load_state("networkidle")
        await page.click("#header > div > div > div > nav > ul > li:nth-child(2) > a")
        await asyncio.sleep(1)
        page.on("request", handle_request)
        await page.set_input_files("#file-input", "a.txt")
        await page.set_input_files("#feedback-file-input","a.txt")

        # Do other actions here, or close the browser
        await browser.close()


if __name__ == "__main__":
    asyncio.run(main())

[mxschmitt]

I can reproduce using the following:

it('should return post data for PUT requests with XHR', async ({ page, server }) => {
  await page.goto(server.EMPTY_PAGE);
  const [request] = await Promise.all([
    page.waitForRequest('**'),
    page.evaluate(({ url }) => {
      return new Promise<void>(resolve => {
        const xhr = new XMLHttpRequest();
        xhr.open('PUT', url);
        xhr.onload = () => resolve();
        const payload = new FormData();
        const file = new Blob(['hello'], { type: 'text/plain' });
        payload.append('value', file);
        xhr.send(payload);
      });
    }, { url: server.PREFIX + '/title.html' })
  ]);
  expect(request.postData()).toContain('hello');
});

Looks like Chromium does not send anything back in the protocol.

[yury-s]

Related issue: #6479