編集:より関連性があるので、以下の答えを確認してください
これは私のために働きました( https://github.com/jspoonerの好意で修正):
次のモンキーパッチを使用して、イニシャライザのディレクトリにファイルを作成します。
require 'faraday'
module Faraday
class Adapter
 class NetHttp < Faraday::Adapter
  def call(env)
    super
    is_ssl = env[:url].scheme == 'https'
    http = net_http_class(env).new(env[:url].host, env[:url].port || (is_ssl ? 443 : 80))
    if http.use_ssl = is_ssl
      ssl = env[:ssl]
      if ssl[:verify] == false
        http.verify_mode = OpenSSL::SSL::VERIFY_NONE
      else
        http.verify_mode = OpenSSL::SSL::VERIFY_NONE # <= PATCH or HACK ssl[:verify]
      end
      http.cert    = ssl[:client_cert] if ssl[:client_cert]
      http.key     = ssl[:client_key]  if ssl[:client_key]
      http.ca_file = ssl[:ca_file]     if ssl[:ca_file]
    end
    req = env[:request]
    http.read_timeout = net.open_timeout = req[:timeout] if req[:timeout]
    http.open_timeout = req[:open_timeout]               if req[:open_timeout]
    full_path = full_path_for(env[:url].path, env[:url].query, env[:url].fragment)
    http_req  = Net::HTTPGenericRequest.new(
      env[:method].to_s.upcase,    # request method
      (env[:body] ? true : false), # is there data
      true,                        # does net/http love you, true or false?
      full_path,                   # request uri path
    env[:request_headers])       # request headers
    if env[:body].respond_to?(:read)
      http_req.body_stream = env[:body]
      env[:body] = nil
    end
    http_resp = http.request http_req, env[:body]
    resp_headers = {}
    http_resp.each_header do |key, value|
      resp_headers[key] = value
    end
    env.update \
      :status           => http_resp.code.to_i,
      :response_headers => resp_headers,
      :body             => http_resp.body
    @app.call env
  rescue Errno::ECONNREFUSED
    raise Error::ConnectionFailed.new(Errno::ECONNREFUSED)
  end
  def net_http_class(env)
    if proxy = env[:request][:proxy]
      Net::HTTP::Proxy(proxy[:uri].host, proxy[:uri].port, proxy[:user], proxy[:password])
    else
      Net::HTTP
    end
  end
 end
end
end