When a knowledge base document is downloaded, the document content is missing

[ocyisheng]

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Dify version

dify 0.15.3 1.0.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

In this file，
/api/controllers/files/image_preview.py

delete the code
if upload_file.size > 0:
response.headers["Content-Length"] = str(upload_file.size)

It will work fine！！！

✔️ Expected Behavior

下载知识库库文档

❌ Actual Behavior

使用流式下载，相应头Content-Length出错

[dosubot]

Hello @ocyisheng! I'm here to help you with any bugs, questions, or contributions you have for the project. Let's work together to solve this issue.

The issue you're encountering seems to be related to the Content-Length header in the HTTP response when downloading knowledge base documents. The user suggests that removing the code setting the Content-Length header in the image_preview.py file resolves the problem. This indicates that the Content-Length header might be causing issues with streaming downloads, possibly due to incorrect size calculations or mismatches.

To address this, you might consider verifying the calculation of upload_file.size to ensure it accurately reflects the file's size. If the size is incorrect, it could lead to incomplete downloads or errors. Alternatively, if the Content-Length header is not essential for your use case, removing it, as suggested, could be a temporary workaround. However, be cautious, as omitting this header might affect download reliability in some scenarios.

To continue talking to Dosu, mention @dosu.

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