{"record":{"id":"4e62f3a8af3a2751","repo":"xtekky/gpt4free","slug":"install-webview-package","errorCode":null,"errorMessage":"Install \"webview\" package","messagePattern":"Install \"webview\" package","errorType":"exception","errorClass":"MissingRequirementsError","httpStatus":null,"severity":"warning","filePath":"g4f/requests/__init__.py","lineNumber":74,"sourceCode":"from .. import debug\nfrom .raise_for_status import raise_for_status\nfrom ..errors import MissingRequirementsError\nfrom ..typing import Cookies\nfrom ..cookies import BrowserConfig, get_cookies_dir\nfrom .defaults import DEFAULT_HEADERS, WEBVIEW_HAEDERS\n\nif not has_curl_cffi:\n\n    class Session:\n        def __init__(self, **kwargs):\n            raise MissingRequirementsError(\n                'Install \"curl_cffi\" package | pip install -U curl_cffi'\n            )\n\n\nasync def get_args_from_webview(url: str) -> dict:\n    if not has_webview:\n        raise MissingRequirementsError('Install \"webview\" package')\n    window = webview.create_window(\"\", url, hidden=True)\n    await asyncio.sleep(2)\n    body = None\n    while body is None:\n        try:\n            await asyncio.sleep(1)\n            body = window.dom.get_element(\"body:not(.no-js)\")\n        except Exception:\n            ...\n    headers = {\n        **WEBVIEW_HAEDERS,\n        \"User-Agent\": window.evaluate_js(\"this.navigator.userAgent\"),\n        \"Accept-Language\": window.evaluate_js(\"this.navigator.language\"),\n        \"Referer\": window.real_url,\n    }\n    cookies = [list(*cookie.items()) for cookie in window.get_cookies()]\n    cookies = {name: cookie.value for name, cookie in cookies}\n    window.destroy()","sourceCodeStart":56,"sourceCodeEnd":92,"githubUrl":"https://github.com/xtekky/gpt4free/blob/973504e1770928ed5fb82f43da528f441ad9ddc3/g4f/requests/__init__.py#L56-L92","documentation":"MissingRequirementsError raised by g4f.requests.get_args_from_webview when the optional 'webview' package (pywebview) is absent: this helper loads a URL in a hidden desktop webview window to scrape real browser headers/args, so it hard-requires webview and a working GUI stack. Note the has_webview guard means the error fires before any window is created.","triggerScenarios":"Calling get_args_from_webview(url) (used by some providers to harvest Cloudflare-passing headers) in an environment without pip install pywebview — typical headless servers also fail later at window creation even with the package installed.","commonSituations":"Deploying g4f to headless Linux servers or containers where the webview path is attempted; minimal installs without the webview extra; CI environments with no display server.","solutions":["Install the package: pip install -U webview (pywebview) if your environment has a GUI/display.","On headless machines, avoid the webview path entirely — use providers that do not need it, or provide args (headers/cookies) explicitly.","In Docker/Linux servers, run under xvfb-run if you truly need the webview flow, or prefer curl_cffi-based providers.","Guard the call: check g4f.requests.has_webview before invoking get_args_from_webview."],"exampleFix":"# before\nargs = await get_args_from_webview(url)  # MissingRequirementsError on headless box\n\n# after\nfrom g4f.requests import has_webview, Session\nif has_webview:\n    args = await get_args_from_webview(url)\nelse:\n    args = {'headers': DEFAULT_HEADERS}  # fall back to static browser headers","handlingStrategy":"validation","validationCode":"from g4f.requests import has_webview\nif not has_webview:\n    raise RuntimeError('pywebview not installed; webview header-scraping unavailable — '\n                       'pass headers explicitly or use a curl_cffi-based provider')","typeGuard":"def webview_available() -> bool:\n    import importlib.util\n    return importlib.util.find_spec('webview') is not None and os.environ.get('DISPLAY') is not None","tryCatchPattern":"from g4f.errors import MissingRequirementsError\ntry:\n    args = await get_args_from_webview(url)\nexcept MissingRequirementsError:\n    args = {'headers': DEFAULT_HEADERS}  # degrade gracefully without the GUI stack","preventionTips":["Check has_webview (and a display server) before calling get_args_from_webview on servers.","Prefer curl_cffi-impersonated sessions over webview scraping in headless deployments.","Install pywebview only in environments that actually have a GUI stack."],"tags":["dependencies","missing-package","webview","headless","g4f"],"backgroundTag":null,"analyzedSha":"973504e1770928ed5fb82f43da528f441ad9ddc3","analyzedAt":"2026-08-14T23:45:32.408Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}