https://github.com/cherry/network-error-logging

Middleware for setting the NEL HTTP response header
https://github.com/cherry/network-error-logging

express hacktoberfest middleware nel network-error-logging

Last synced: about 1 month ago
JSON representation

Middleware for setting the NEL HTTP response header

• Host: GitHub
• URL: https://github.com/cherry/network-error-logging
• Owner: Cherry
• License: mit
• Created: 2018-11-17T18:47:51.000Z (about 6 years ago)
• Default Branch: main
• Last Pushed: 2024-11-25T13:01:51.000Z (about 1 month ago)
• Last Synced: 2024-11-27T03:34:22.376Z (about 1 month ago)
• Topics: express, hacktoberfest, middleware, nel, network-error-logging
• Language: JavaScript
• Homepage:
• Size: 1.31 MB
• Stars: 5
• Watchers: 3
• Forks: 4
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

Awesome Lists containing this project

README

        
Network Error Logging

==============

[![npm version](https://badge.fury.io/js/network-error-logging.svg)](https://badge.fury.io/js/network-error-logging)

[![dependencies Status](https://david-dm.org/Cherry/network-error-logging/status.svg)](https://david-dm.org/Cherry/network-error-logging)

[![Actions Status](https://github.com/Cherry/network-error-logging/workflows/Test/badge.svg)](https://github.com/Cherry/network-error-logging/actions)

[![Coverage Status](https://coveralls.io/repos/github/Cherry/network-error-logging/badge.svg?branch=main)](https://coveralls.io/github/Cherry/network-error-logging?branch=main)

[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FCherry%2Fnetwork-error-logging.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2FCherry%2Fnetwork-error-logging?ref=badge_shield)

This is Express middleware to set the `NEL` HTTP response header. You can read more about it [here](https://www.w3.org/TR/network-error-logging/#nel-response-header).

To use:

```javascript

const NEL = require('network-error-logging')

// ...

app.use(NEL({

  report_to: 'endpoint-1', // REQUIRED to register. OPTIONAL if intention is to remove a previous registration. defined in the Report-To header

  max_age: 31_536_000, // REQUIRED. seconds

  include_subdomains: true, // OPTIONAL

  success_fraction: 0.5, // OPTIONAL. sampling rate

  failure_fraction: 0.5, // OPTIONAL. sampling rate

  request_headers: ["If-None-Match"], // OPTIONAL. request headers whose names and values are included in the network error reports

  response_headers: ["ETag"] // OPTIONAL. response headers whose names and values are included in the network error reports

}))

```

For further documentation on each field, see https://w3c.github.io/network-error-logging/#nel-response-header.

This header is best set with a previously defined `Report-To` group. [This module](https://github.com/Cherry/report-to) is a great way to do that.

https://report-uri.com/ is a great reporting platform for monitoring CSP, NEL, etc. error logs.

## License

[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FCherry%2Fnetwork-error-logging.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2FCherry%2Fnetwork-error-logging?ref=badge_large)