[DID YOU KNOW] DAVdroid can use HTTP/2 to improve performance and save traffic


  • developer

    DAVdroid uses okhttp as an HTTP client, and okhttp is ready for HTTP/2. We're trying to contribute to okhttp by submitting qualified bug reports, patches, components (Digest authentication handler) etc.

    Major HTTP/2 (RFC 7540) improvements (in comparison to HTTP/1.1):

    • multiplexing of requests over a single TCP connection, thus
    • saving costly TCP handshakes (= time and traffic),
    • saving costly TLS handshakes (= time and traffic);
    • more efficient message processing through binary message framing,
    • compression of HTTP headers.

    In CalDAV/CardDAV context, it means that for synchronization of one collection, only one TCP/TLS handshake is required and HTTP headers are transferred compressed. (Body compression using gzip is also supported.)

    Many servers are supporting HTTP/2, for instance nginx 1.9.5+ and Apache 2.4.12+.

    Our Web sites, including this forum, support HTTP/2, too.


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