A reasonably practical guide to validating RFC 9421 HTTP Signatures for ActivityPub in PHP

· · Sept. 3, 2026, 1:38 p.m.
PHP WebDev mastodon etc HTTP Signatures activitypub PHP Development mastodon
Summary
This blog post provides a practical guide to validating RFC 9421 HTTP Signatures in PHP, specifically for developers working with Mastodon and other Fediverse servers. While the guide acknowledges its limitations, it aims to help readers who are struggling with HTTP Signatures and offers some code examples to assist.
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