Loading web pages with WebBaseLoader in LangChain - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What does WebBaseLoader return after loading a web page?

Using WebBaseLoader from LangChain, what is the type of the object returned after calling the load() method on a valid URL?

LangChain

from langchain.document_loaders import WebBaseLoader
loader = WebBaseLoader('https://example.com')
docs = loader.load()

A A dictionary with keys 'title' and 'content' of the page

B A list of Document objects containing the page content and metadata

C A single string with the raw HTML content of the page

D An integer representing the HTTP status code of the page

💡 Hint

Think about how LangChain organizes loaded data for further processing.

WebBaseLoader.load() returns a list of Document objects, each holding the text content and metadata like URL. It does not return raw HTML or status codes directly.

📝 Syntax

intermediate

Which code snippet correctly initializes WebBaseLoader for multiple URLs?

You want to load content from two web pages using WebBaseLoader. Which code correctly initializes the loader for both URLs at once?

A loader = WebBaseLoader(['https://site1.com', 'https://site2.com'])

B loader = WebBaseLoader('https://site1.com;https://site2.com')

C loader = WebBaseLoader(('https://site1.com', 'https://site2.com'))

D loader = WebBaseLoader('https://site1.com', 'https://site2.com')

💡 Hint

Check the expected argument type for WebBaseLoader constructor.

WebBaseLoader accepts a list of URLs as a single argument to load multiple pages. Passing multiple string arguments or a single string with separators is invalid.

🔧 Debug

advanced

Why does this WebBaseLoader code raise a TypeError?

Consider this code snippet:

loader = WebBaseLoader(12345)
docs = loader.load()

Why does it raise a TypeError?

LangChain

loader = WebBaseLoader(12345)
docs = loader.load()

A Because WebBaseLoader does not support loading from numbers

B Because load() requires an argument specifying the URL

C Because the URL argument must be a string or list of strings, not an integer

D Because the loader variable is not defined before calling load()

💡 Hint

Check the expected type for the URL parameter in WebBaseLoader.

WebBaseLoader expects a string or list of strings representing URLs. Passing an integer causes a TypeError during initialization or loading.

❓ state_output

advanced

What is the length of the list returned by WebBaseLoader.load() for multiple URLs?

If you initialize WebBaseLoader with three valid URLs and call load(), how many Document objects will the returned list contain?

LangChain

loader = WebBaseLoader(['https://a.com', 'https://b.com', 'https://c.com'])
docs = loader.load()
print(len(docs))

A Depends on the size of each web page

B 1

C 0

D 3

💡 Hint

Each URL corresponds to one Document object in the output list.

WebBaseLoader.load() returns one Document per URL provided, so the list length matches the number of URLs.

🧠 Conceptual

expert

What happens if WebBaseLoader tries to load a non-existent web page?

When WebBaseLoader.load() is called with a URL that returns a 404 error, what is the expected behavior?

LangChain

loader = WebBaseLoader('https://nonexistent.example.com')
docs = loader.load()

A It raises an HTTPError exception indicating the page was not found

B It returns a Document object with empty content and metadata

C It returns an empty list with no Document objects

D It silently skips the URL and returns Documents for other URLs only

💡 Hint

Consider how HTTP errors are handled by default in web requests.

WebBaseLoader uses requests under the hood which raises HTTPError on 4xx/5xx status codes unless caught. So a 404 causes an exception.