错误信息：
KeyError: key not found: :ciphers
from /Users/mike/.rvm/gems/ruby-2.4.0@sa/gems/rest-client-1.8.0/lib/restclient/request.rb:163:in `fetch'
from /Users/mike/.rvm/gems/ruby-2.4.0@sa/gems/rest-client-1.8.0/lib/restclient/request.rb:163:in `initialize'
from /Users/mike/.rvm/gems/ruby-2.4.0@sa/gems/rest-client-1.8.0/lib/restclient/request.rb:41:in `new'
from /Users/mike/.rvm/gems/ruby-2.4.0@sa/gems/rest-client-1.8.0/lib/restclient/request.rb:41:in `execute'
原因：
https://github.com/rest-client/rest-client/issues/569
RestClient checks for weak ciphers onOpenSSL::SSL::SSLContext::DEFAULT_PARAMSbut ciphers param was removed from the defaults for openssl 2.0 built with OpenSSL version 1.1.0 or newer, since it was a workaround for OpenSSL bad DEFAULT. See PRruby/openssl#66
So for ruby 2.4 and openssl 2.0.2 built with OpenSSL 1.1.0 I'm gettingKeyError: key not found: :ciphers.
One way of checking for default ciphers with openssl built with OpenSSL 1.1.0 is
OpenSSL::SSL::SSLContext.new.ciphers.map { |v,_,_,_,_| v }.join(':')
修改：
参考：
https://github.com/rest-client/rest-client/pull/572/commits/ec58882a81f2ca6a8d1944d090dfdc71c58a9b49
注释这两行，
ifWeakDefaultCiphers.include?(
OpenSSL::SSL::SSLContext::DEFAULT_PARAMS.fetch(:ciphers))
修改为：
ifdefined?(OpenSSL::OPENSSL_LIBRARY_VERSION)&&
OpenSSL::OPENSSL_LIBRARY_VERSION.start_with?("OpenSSL 1.1")
ciphers=OpenSSL::SSL::SSLContext.new.ciphers.map(&:first).join(':')
else
ciphers=OpenSSL::SSL::SSLContext::DEFAULT_PARAMS.fetch(:ciphers)
end
ifWeakDefaultCiphers.include?(ciphers)
