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Optimizing HTML Delivery in Flask with Minification and Compression

Tutorial August 20, 2024
python 

from flask import Response
import gzip
from io import BytesIO

@app.after_request
def after_request(response):
    if response.content_type == 'text/html; charset=utf-8':
        minified = minify(response.get_data(as_text=True))
        gzip_buffer = BytesIO()
        with gzip.GzipFile(mode='wb', fileobj=gzip_buffer) as gzip_file:
            gzip_file.write(minified.encode('utf-8'))

        response.set_data(gzip_buffer.getvalue())
        response.headers['Content-Encoding'] = 'gzip'
        response.headers['Content-Length'] = len(response.get_data())
    return response
  • gzip.GzipFile: Compresses the minified HTML content.
  • response.headers['Content-Encoding'] = 'gzip': Informs the browser that the content is compressed using gzip.
  • response.headers['Content-Length']: Updates the Content-Length header to reflect the compressed size.

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