Robot Framework Chrome Headless _hot_ Download 🚀
*** Settings *** Library SeleniumLibrary Library BrowserHelper.py *** Test Cases *** Force Download via CDP Open Browser ${URL} headlesschrome Enable Download In Headless Chrome ${DOWNLOAD_PATH} Click Element id=download-link Use code with caution. Troubleshooting Common Issues Stack Overflowhttps://stackoverflow.com
*** Settings *** Library SeleniumLibrary Library Collections *** Variables *** ${DOWNLOAD_PATH} ${CURDIR}${/}downloads ${URL} https://example.com *** Test Cases *** Download File In Headless Chrome # 1. Define Preferences ${prefs}= Create Dictionary ... download.default_directory=${DOWNLOAD_PATH} ... download.prompt_for_download=${FALSE} ... plugins.always_open_pdf_externally=${TRUE} # 2. Setup Chrome Options ${options}= Evaluate sys.modules['selenium.webdriver'].ChromeOptions() sys, selenium.webdriver Call Method ${options} add_argument --headless=new Call Method ${options} add_argument --no-sandbox Call Method ${options} add_experimental_option prefs ${prefs} # 3. Open Browser Open Browser ${URL} chrome options=${options} Click Element id=download-button # 4. Verification Wait Until Keyword Succeeds 30s 2s File Should Exist ${DOWNLOAD_PATH}/expected_file.pdf Use code with caution. Method 2: Enabling Download via CDP (Advanced Workaround)
from robot.libraries.BuiltIn import BuiltIn def enable_download_in_headless_chrome(download_path): driver = BuiltIn().get_library_instance('SeleniumLibrary').driver driver.execute_cdp_cmd('Page.setDownloadBehavior', { 'behavior': 'allow', 'downloadPath': download_path }) Use code with caution. robot framework chrome headless download
Define where the file should go and disable interactive prompts.
Downloading files in mode using Robot Framework often presents a challenge because, by default, headless browsers disable file downloads for security reasons. To enable this functionality, you must explicitly configure browser preferences and, in some cases, use the Chrome DevTools Protocol (CDP) to authorize the download behavior. Core Configuration Requirements download
Use --headless=new for modern versions of Chrome (v109+) to ensure better compatibility with standard browser features. Method 1: Using Open Browser with chrome_options
To successfully download files in headless mode, you generally need to address two areas: Setup Chrome Options ${options}= Evaluate sys
If the standard prefs fail in highly restricted environments, you can use the to force the browser to allow downloads. This often requires a custom Python keyword to access the underlying driver instance. Python Helper ( BrowserHelper.py ):
The most common approach involves creating a dictionary of preferences and passing it through the Open Browser keyword in the SeleniumLibrary.
