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Compress and minify Flask responses!

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Flask-Squeeze is a Flask extension that automatically:

  • Minifies repsonses with the mimetypes javascript and css
  • Compresses all responses with brotli if the browser supports it, or gzip if the browser supports it!
  • Secured against the BREACH exploit
  • Caches static files so that they don't have to be re-compressed. The cache will be cleared each time Flask restarts. Files are considered to be static if they contain ".../static/..." in their request path.

Compatibility

  • Tested with Python 3.7, 3.8, 3.9, 3.10 and 3.11

Installation

pip install Flask-Squeeze

Usage

Initialize Flask-Squeeze BEFORE all other extensions and after_request handlers! Flask executes after_request handlers in reverse order of declaration, and the compression should be the last step before sending the response.

from flask_squeeze import Squeeze
squeeze = Squeeze()

def create_app():
    app = Flask(__name__)
    squeeze.init_app(app)
    # Init all other extensions AFTER Flask-Squeeze
    # ...

    return app

Thats it! The responses of your Flask app will now get minified and compressed, if the browser supports it. To control how Flask-Squeeze behaves, the following options exist:

General options

You can configure Flask-Squeeze with the following options in your Flask config:

  • COMPRESS_FLAG (default=True): Globally enables or disables Flask-Squeeze
  • COMPRESS_MIN_SIZE (default=500): Defines the minimum file size in bytes to activate the compression
  • COMPRESS_VERBOSE_LOGGING (default=False): Enable or disable verbose logging. If enabled, Flask-Squeeze will print what it does into the terminal in a highlighted color.

Minification options

  • COMPRESS_MINIFY_HTML (default=True): Enable or disable HTML minification using htmlmin.
  • COMPRESS_MINIFY_CSS (default=True): Enable or disable css minification using rcssmin.
  • COMPRESS_MINIFY_JS (default=True): Enable or disable js minification using rjsmin.

Compression level options

Static files are chached, so they only have to be compressed once. Dynamic files like generated HTML files will not be cached, so they will be compressed for each response.

  • COMPRESS_LEVEL_BROTLI_STATIC (default=11, min=0 , max=11): Defines the compression level of brotli for static files.
  • COMPRESS_LEVEL_BROTLI_DYNAMIC (default=1, min=0, max=11): Defines the compression level of brotli for dynamic files.
  • COMPRESS_LEVEL_DEFLATE_STATIC (default=9, min=-1 , max=9): Defines the compression level of deflate for static files.
  • COMPRESS_LEVEL_DEFLATE_DYNAMIC (default=1, min=-1, max=9): Defines the compression level of deflate for dynamic files.
  • COMPRESS_LEVEL_GZIP_STATIC (default=9, min=0 , max=9): Defines the compression level of gzip for static files.
  • COMPRESS_LEVEL_GZIP_DYNAMIC (default=1, min=0, max=9): Defines the compression level of gzip for dynamic files.

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