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langgenius / dify

Dify is an open-source LLM app development platform. Dify's intuitive interface combines AI workflow, RAG pipeline, agent capabilities, model management, observability features and more, letting you quickly go from prototype to production.
https://dify.ai
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The webscraper plugin cannot capture the full content of the webpage #2924

Closed Caixiaopig closed 6 months ago

Caixiaopig commented 6 months ago

Self Checks

Dify version

0.5.9

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

  1. Create an application, use Agent mode, and add the WEBSCRAPER tool
  2. Publish the application and chat
  3. Allow the chatbot to access the website and summarize the content, for example: https://mp.weixin.qq.com/s/Eq0VXGnD1JAI3UDcXS8Csg The summary content is missing, open the response content of WEBSCRAPER, and find that it did not return the complete webpage text content.

✔️ Expected Behavior

Can the WEBSCRAPER capture all the content and provide it to the large model for subsequent dialogue?

❌ Actual Behavior

The summary content is missing, open the response content of WEBSCRAPER, and find that it did not return the complete webpage text content.

dosubot[bot] commented 6 months ago

Hey @Caixiaopig! Great to see you around here again. Hope you're doing well!

Thank you for your detailed report. Based on the information you provided and the context from the Dify repository, there could be several reasons why the WEBSCRAPER tool is not capturing the full content of the webpage.

  1. Content Type Support: The get_url function checks the content type of the URL response and only processes types listed in supported_content_types. If the content type of the webpage is not supported, the tool will not capture its content. You can check the content type of the webpage you are trying to scrape to see if it's supported.

  2. Content Extraction Limitations: The tool uses different methods (readabilipy and newspaper3k) to extract content from webpages. Each method has its own limitations regarding how it parses and extracts content. For example, dynamic content loaded via JavaScript might not be captured correctly.

  3. Truncation Due to Maximum Chunk Length: When not summarizing, the tool paginates the content based on max_chunk_length and cursor. If the content exceeds this length, it will be truncated, and a message will be appended indicating that the page was truncated.

  4. Failure in External Tools or Libraries: The tool relies on external libraries (readabilipy, newspaper3k) and subprocess calls to node.js for content extraction. Failures or limitations in these external dependencies could lead to incomplete content capture.

  5. Network or Request Issues: The requests library is used to fetch the webpage content. Network issues, request timeouts, or the webpage not responding correctly to the crafted request headers could result in failed or partial content capture.

  6. Summary Mode Limitations: When in summary mode, the tool limits the processing to the first 5 documents after splitting the text. If the relevant content is beyond this limit, it might not be captured.

  7. Unsupported or Malformed Webpage Structures: The content extraction logic might not handle all webpage structures effectively, especially if the webpage has a complex or non-standard layout.

To diagnose the specific issue, one would need to analyze the webpage being scraped, check for any error messages or logs produced by the tool, and possibly adjust the tool's logic or its dependencies' configurations to better handle the webpage's content.

You can find more details in the web_reader_tool.py file.

Regarding your question about the changes made to the WEBSCRAPER tool in the Dify version 0.5.10 compared to the 0.5.9 version, I wasn't able to find specific changes in the repository. However, it's worth noting that the latest version of Dify is 0.5.10, so it might be beneficial to update your version to the latest one, as it may contain improvements or fixes that could potentially resolve your issue.

I hope this information helps! If you have any other questions or need further clarification, feel free to ask.

Sources

#### About Dosu This response is meant to be useful and save you time. It is **not meant to be a precise solution**, but rather a starting point for your own research. Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant. If you want to continue the conversation, start your reply with @dosu-bot.
crazywoola commented 6 months ago

This webpage is too long to be retrieved and set them in the agent. This is a limitation of llm itself. Also, the web scrapper will be rejected due to the anti-spider policy, because this is a simple tool.