H2O is a very fast HTTP server written in C

Key Features

• HTTP/1.0, HTTP/1.1
  • uses PicoHTTPParser
• HTTP/2
  • supports the final version¹
  • negotiation methods: NPN, ALPN, Upgrade, direct
  • dependency and weight-based prioritization
  • server push
• WebSocket²
• TLS
  • uses OpenSSL or LibreSSL
  • forward secrecy
  • AEAD ciphers including the upcoming ones preferred by Google Chrome³
  • OCSP stapling⁴
  • session resumption and session tickets⁵
• static file serving
  • conditional GET using last-modified / etag
  • directory listing
  • mime-type configuration
• reverse proxy
  • HTTP/1.x only⁶
  • persistent upstream connection
• access-logging
  • apache-like format strings
• graceful restart and self-upgrade

https://h2o.github.io/

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