[Python] TypeError: Failed to fetch when uploading CSV file using Playwright and Python

Environment:

Python with Playwright Running on localhost:8000 Chrome browser in non-headless mode

Problem: I'm trying to upload a CSV file using Playwright with Python, but I'm getting the following errors in the console:

Failed to load resource: the server responded with a status of 404 (Not Found) for favicon.ico POST http://localhost:8000/upload - net::ERR_H2_OR_QUIC_REQUIRED Uncaught (in promise) TypeError: Failed to fetch at handleSubmit
enter image description here Pic with the isshu

Code: Here's my Playwright test code:

Here is the full code:

https://github.com/BoazYashar/Shopic


def test_response_format_and_values():
with sync_playwright() as playwright:
browser = playwright.chromium.launch(headless=False)
page = browser.new_page()
upload_page = UploadPage(page)

# Upload a valid file and click on upload
response = upload_page.upload_file("valid_products.csv")


And here's the relevant page object code:

class UploadPage(BasePage):
def upload_file(self, file_name: str) -> str:
self.navigate("http://localhost:8000")
file_path = str(CSV_FILE_PATH / file_name)
self.page.set_input_files(self.file_input_selector, file_path)
self.page.wait_for_selector(self.upload_button_selector)
self.page.click(self.upload_button_selector)
self.page.wait_for_selector(self.message_selector)
results = self.page.text_content(self.message_selector)
return results



What I've Tried: The file upload interface appears to be working (I can select the file), but the actual POST request to /upload is failing with a network error. Question: Why am I getting the ERR_H2_OR_QUIC_REQUIRED error and how can I fix it? The error suggests there might be an issue with the HTTP/2 protocol, but I'm not sure how to properly configure this for local development.

What I've Tried:

• I tried uploading the file in several different ways, but none worked
• I attempted various HTTP/2 solutions suggested by ChatGPT

Expected Behavior: The CSV file should be uploaded successfully to the local server and return a JSON response.

Actual Behavior: The request fails with ERR_H2_OR_QUIC_REQUIRED and a TypeError: Failed to fetch error.

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