πŸ› οΈToolsShed

HTTP Cache Header Generator

Visually build Cache-Control headers with directives explained.

Generated Header

Cache-Control: (none)

Presets

Frequently Asked Questions

Code Implementation

from flask import Flask, make_response, send_file
import hashlib
import time

app = Flask(__name__)

@app.route('/static/asset')
def serve_immutable_asset():
    """Cache forever β€” content-hashed file (e.g., bundle.abc123.js)"""
    response = make_response("asset content")
    response.headers['Cache-Control'] = 'public, max-age=31536000, immutable'
    return response

@app.route('/api/data')
def serve_api_data():
    """Short-lived private API response with ETag"""
    data = "dynamic content"
    etag = hashlib.md5(data.encode()).hexdigest()

    response = make_response(data)
    response.headers['Cache-Control'] = 'private, max-age=60'
    response.headers['ETag'] = f'"{etag}"'
    return response

@app.route('/page')
def serve_page():
    """HTML page: always check freshness, cache 10 minutes"""
    response = make_response("<html>...</html>")
    response.headers['Cache-Control'] = 'public, max-age=600, must-revalidate'
    response.headers['Last-Modified'] = 'Mon, 01 Jan 2024 00:00:00 GMT'
    return response

@app.route('/auth')
def serve_auth_page():
    """Never cache sensitive pages"""
    response = make_response("sensitive content")
    response.headers['Cache-Control'] = 'no-store'
    return response

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