Скачать или смотреть How to View FPDF PDF via HTTP Response in Django

Discover how to successfully display `FPDF` PDF documents through HTTP responses in Django without encountering errors.
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This video is based on the question https://stackoverflow.com/q/77706743/ asked by the user 'shyam rathod' ( https://stackoverflow.com/u/20142866/ ) and on the answer https://stackoverflow.com/a/77708325/ provided by the user 'Marco' ( https://stackoverflow.com/u/4151233/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to View FPDF PDF via HTTP Response in Django

If you're working with Django and need to generate and display PDF files using FPDF, you may encounter an issue where the PDF does not render correctly in the browser. In this guide, we will discuss common errors and provide a detailed solution to render your PDF successfully in a new tab.

The Problem

When trying to generate and view a PDF file in a new browser tab using FPDF and Django, many developers face challenges. The code snippet provided often leads to an error when attempting to return the generated PDF.

Here's a simplified version of the code to illustrate the context:

[[See Video to Reveal this Text or Code Snippet]]

Understanding the Solution

Issue with Previous Code

The primary issue with the code above is that it tries to return the PDF directly from the pdf.output() method, which does not return the PDF content in a format that can be easily read by the HTTP response. Instead, it should be returned as a binary stream.

Steps to Fix the Code

Use the io.BytesIO Stream:
Instead of directly outputting the PDF file, we will use a binary stream to capture the output.

Return the PDF Using FileResponse:
Utilize Django's FileResponse to facilitate the downloading or viewing of the PDF document.

Here’s how the refactored code looks:

[[See Video to Reveal this Text or Code Snippet]]

Summary of Changes

Import BytesIO from the io module: This allows you to create an in-memory binary stream to hold file data.

Use FileResponse for the output: This tells Django to send the PDF as a response in the correct format.

Ensure the file stream is properly reset: Always seek the start of the stream before sending it as a response to prevent issues with file readings.

Conclusion

By following these revised steps, you can successfully view PDFs generated with FPDF in a new browser tab without any errors. Ensure that you handle your file streams correctly to provide the best user experience.

Now you're ready to implement this solution in your Django projects, and generate PDF files seamlessly!