A Free Software, multi-threaded, non-blocking network
application server designed for low _idle_ power consumption.
It is primarily optimized for applications with occasional users
which see little or no traffic.  yahns currently hosts Rack/HTTP
applications, but may eventually support other application
types.  Unlike some existing servers, yahns is extremely
sensitive to fatal bugs in the applications it hosts.

Changes:

    yahns 1.12.0 - TLS fixes and more!

    Most notably, serving static files over HTTPS did not work
    before this release with the "sendfile" gem installed.  The
    yahns_config(5) manpage is also updated with an example for
    using OpenSSL::SSL::SSLContext objects.  Users of
    Rack::Request#scheme and env['rack.url_scheme'] should see
    "https" properly set for HTTPS connections.

    There's also a bunch of internal tweaks like taking advantage of
    the file-level frozen_string_literal: directive in 2.3 and
    explicitly clearing short-lived string buffers

    TLS support is still in its early stages, but I'm experimenting
    with Let's Encrypt (via getssl[1]) and hosting https://YHBT.net/
    on it.

    For now, I suggest using a separate yahns instance (with a
    different master process) to avoid any potential data leaks
    between HTTPS and HTTP instances.  In the future, it may be
    possible to isolate HTTPS from HTTP at the worker process level.
    Supporting GnuTLS (alongside OpenSSL) may be in our future, too.

    To paraphrase the warning in http://www.postfix.org/TLS_README.html
    (which was written before Heartbleed):

        WARNING

          By turning on TLS support in yahns, you not only get the
          ability to encrypt traffic and to authenticate remote
          clients.  You also turn on thousands and thousands of
          lines of OpenSSL library code.  Assuming that OpenSSL is
          written as carefully as Eric's own code, every 1000 lines
          introduce one additional bug into yahns.

    I'm not nearly as careful with yahns as Wietse is with postfix,
    either.

    20 changes since v1.11.0:
          README: updates for kqueue
          add .gitattributes for Ruby method detection
          nodoc internals
          enable frozen_string_literal for Ruby 2.3+
          copyright updates for 2016
          extras/exec_cgi: fix frozen string error on slow responses
          avoid StringIO#binmode for the next few years
          use String#clear for short-lived buffers we create
          gemspec: make rack a development dependency
          build: install-gem forced to "--local" domain
          acceptor: all subclasses of TCPServer use TCP_INFO
          properly emulate sendfile for OpenSSL sockets
          avoid race conditions in OpenSSL::SSL::SSLContext#setup
          set HTTPS and rack.url_scheme in Rack env as appropriate
          proxy_pass: pass X-Forwarded-Proto through
          doc: switch to perlpod (from pandoc-flavored Markdown)
          doc: trim down documentation slightly
          doc: document ssl_ctx for "listen" directive
          doc: various doc and linkification improvements
          http_context: reduce constant lookup + bytecode

    [1] git clone https://github.com/srvrco/getssl.git

Please note the disclaimer:

  yahns is extremely sensitive to fatal bugs in the apps it hosts.  There
  is no (and never will be) any built-in "watchdog"-type feature to kill
  stuck processes/threads.  Each yahns process may be handling thousands
  of clients; unexpectedly killing the process will abort _all_ of those
  connections.  Lives may be lost!

  yahns hackers are not responsible for your application/library bugs.
  Use an application server which is tolerant of buggy applications
  if you cannot be bothered to fix all your fatal bugs.

* git clone git://yhbt.net/yahns
* http://yahns.yhbt.net/README
* http://yahns.yhbt.net/NEWS.atom.xml
* we only accept plain-text email yahns-public / yhbt.net
* and archive all the mail we receive: http://yhbt.net/yahns-public/
* nntp://news.public-inbox.org/inbox.comp.lang.ruby.yahns

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