Introduction to Etagify

Etagify is a powerful API service designed to optimize the performance of your web applications by leveraging the principles of Entity Tags (ETags). ETags are a mechanism that helps in controlling caching behavior, ensuring efficient data delivery, and minimizing server load. This comprehensive guide delves into the various Etagify APIs, providing you with practical code snippets and real-use case examples to get you started.

Etagify API Examples

1. Generating ETags

The following code snippet demonstrates how to generate an ETag for a given resource:

  const etagify = require('etagify');

  app.get('/generate-etag', (req, res) => {
    const content = 'Sample Content';
    const etag = etagify.generateETag(content);
    res.set('ETag', etag).send(content);
  });

2. Validating ETags

Here is how you can validate an existing ETag against a given resource:

  const etagify = require('etagify');

  app.get('/validate-etag', (req, res) => {
    const existingETag = req.headers['if-none-match'];
    const content = 'Sample Content';
    const isValid = etagify.validateETag(existingETag, content);

    if (isValid) {
      res.status(304).end(); // Not Modified
    } else {
      const newETag = etagify.generateETag(content);
      res.set('ETag', newETag).send(content);
    }
  });

3. Strong vs Weak ETags

Etagify supports both strong and weak ETags. The following example shows how to generate a weak ETag:

  const etagify = require('etagify');

  app.get('/generate-weak-etag', (req, res) => {
    const content = 'Sample Content';
    const weakETag = etagify.generateETag(content, { weak: true });
    res.set('ETag', weakETag).send(content);
  });

App Example with Etagify APIs

This example demonstrates how to use Etagify in a simple Express.js application:

  const express = require('express');
  const etagify = require('etagify');
  const app = express();

  app.get('/resource', (req, res) => {
    const content = 'Sample Resource Content';
    const etag = etagify.generateETag(content);
    const clientETag = req.headers['if-none-match'];

    if (etag === clientETag) {
      res.status(304).end(); // Not Modified
    } else {
      res.set('ETag', etag).send(content);
    }
  });

  app.listen(3000, () => {
    console.log('Server running on port 3000');
  });

By using Etagify, you can significantly improve the performance of your web applications by reducing bandwidth usage and ensuring that clients receive the most up-to-date content efficiently.

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