* lib/webrick/cgi.rb (CGI::Socket): add check for existence of
OpenSSL module in all HTTPS related methods.
* lib/webrick/cgi.rb (CGI::Socket#cipher): should create similar
value to OpenSSL::SSLSocket#cipher.
* lib/webrick/httpresponse.rb (HTTPResponse#setup_header): should
set "connection: close" if @keep_alive is false.
* lib/webrick/https.rb (HTTPrequest#meta_vars): add supprt for
SSL_PROTOCOL, SSL_CIPHER_USEKEYSIZE and SSL_CIPHER_ALGKEYSIZE.
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HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH.
* lib/webrick/https.rb (HTTPRequest#parse): should check presence
of cert() method to detect SSLSocket.
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* lib/webrick/https.rb (HTTPRequest#meta_vars): create
SSL_CLIENT_CERT_CHAIN_n from @client_cert_chain.
* ext/openssl/ossl_ssl.c (ossl_ssl_get_peer_cert_chain): return nil
if no cert-chain was given.
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* lib/webrick/https.rb: SSLSocket handling is moved to webrick/ssl.rb.
* lib/webrick/compat.rb (File::fnmatch): remove old migration code.
* lib/webrick/httpserver.rb (HTTPServer#run): ditto.
* lib/webrick/server.rb (GenericServer#listen): the body of this
method is pull out as Utils::create_lisnteners.
* lib/webrick/utils.rb (Utils::create_lisnteners): new method.
* lib/webrick/server.rb (GenericServer#start): should not
through unknown errors. and refine comments.
* ext/openssl/lib/openssl/ssl.rb (SSLServer#accept): should close
socket if SSLSocket raises error.
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