etag 1.8.1

The etag package is a JavaScript module that allows developers to generate HTTP ETags. ETags, as defined in RFC 7232, are essential for web optimization because they provide a mechanism for validating entities cached in a client's browser. With ETags, a client can make conditional requests to validate an entity, reducing unnecessary traffic and making for a more efficient web experience.

To use the etag package, start by installing it through the npm registry by using the npm install etag command in the terminal. In your code, you can require the package by using var etag = require('etag'). You can generate an ETag for an entity (the complete body of an entity) via etag(entity, [options]). Acceptable entities are Strings, Buffers, and fs.Stats. The 'options' parameter lets you specify whether to generate a strong or weak ETag (with the weak validator mark, the leading 'W/'). By default, 'options.weak' is false, meaning a strong ETag will be generated, unless the entity is 'fs.Stats', for which a weak ETag will be generated. A code example of setting an ETag for an HTTP response can be: res.setHeader('ETag', etag(body)).

var etag = require('etag')

// ... your application code here ...

var body = 'Hello, world!'
res.setHeader('ETag', etag(body))

Documentation for the etag package doesn't exist as separate documentation files or sites. Instead, all the necessary information, including the API reference and usage examples, are directly laid out in the readme file of the repository, which is accessible through its GitHub page here. For additional queries or clarifications, you can inspect the code directly or check the repository's issues for similar questions. Open-source platforms such as this support community contributions, which often include discussions and resolutions for common issues or confusions.