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本示例介绍了如何从一系列URL中加载HTML文档，并将其转换为我们可以在下游使用的Document格式。

无结构URL加载器​

您需要安装unstructured库：

!pip install -U unstructured
from langchain_community.document_loaders import UnstructuredURLLoader
urls = [
    "https://www.understandingwar.org/backgrounder/russian-offensive-campaign-assessment-february-8-2023",
    "https://www.understandingwar.org/backgrounder/russian-offensive-campaign-assessment-february-9-2023",
]

在headers=headers中传入ssl_verify=False以解决ssl_verification错误。

loader = UnstructuredURLLoader(urls=urls)
data = loader.load()

Selenium URL加载器​

这部分介绍了如何使用SeleniumURLLoader从URL列表中加载HTML文档。

使用Selenium可以加载需要JavaScript渲染的页面。

要使用SeleniumURLLoader，您需要安装selenium和unstructured。

!pip install -U selenium unstructured
from langchain_community.document_loaders import SeleniumURLLoader
urls = [
    "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
    "https://goo.gl/maps/NDSHwePEyaHMFGwh8",
]
loader = SeleniumURLLoader(urls=urls)
data = loader.load()

Playwright URL加载器​

这部分介绍了如何使用PlaywrightURLLoader从URL列表中加载HTML文档。

Playwright为现代Web应用程序提供可靠的端到端测试。

与Selenium的情况类似，Playwright允许我们加载和渲染JavaScript页面。

要使用PlaywrightURLLoader，您需要安装playwright和unstructured。此外，您还需要安装Playwright Chromium浏览器：

!pip install -U playwright unstructured
!playwright install
from langchain_community.document_loaders import PlaywrightURLLoader
urls = [
    "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
    "https://goo.gl/maps/NDSHwePEyaHMFGwh8",
]
loader = PlaywrightURLLoader(urls=urls, remove_selectors=["header", "footer"])
data = loader.load()

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