REDbot is lint for HTTP resources. it tests protocol correctness, cacheability, content negotiation and more.
Cost / License
- Free
- Open Source
Platforms
- Online
- Self-Hosted
- Docker
Australia

Apps similar to HTTP Observatory include Web Check, which is free and open source. Other options are SiteOne Crawler, Google Lighthouse, SpiderFoot and Blacklight Privacy Inspector. You're spoiled for choice with Website Audit Tools like HTTP Observatory: we list more than 25 alternatives for the web, self-hosting, Linux, Windows and Mac.
REDbot is lint for HTTP resources. it tests protocol correctness, cacheability, content negotiation and more.

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