class Faraday::FollowRedirects::Middleware

end
faraday.adapter Faraday.default_adapter
faraday.use :cookie_jar
faraday.use FaradayMiddleware::FollowRedirects
Faraday.new(:url => url) do |faraday|
the faraday-cookie_jar gem:
If you wish to persist cookies across redirects, you could use
doesn’t support parallelism.
This middleware currently only works with synchronous requests; i.e. it
to opt into HTTP/1.1 compliance and act unlike the major web browsers.
however, the HTTP method after 301/302 remains unchanged. This allows you
request gets converted into a GET. With ‘:standards_compliant => true`,
For HTTP 301, 302, and 303, the original GET, POST, PUT, DELETE, or PATCH
Public: Follow HTTP 301, 302, 303, 307, and 308 redirects.

def call(env) 

def call(env)
  perform_with_redirection(env, follow_limit)
end

def callback 

def callback
  @options[:callback]
end

def clear_authorization_header(env, from_url, to_url) 

def clear_authorization_header(env, from_url, to_url)
  return env if redirect_to_same_host?(from_url, to_url)
  return env unless @options.fetch(:clear_authorization_header, true)
  env[:request_headers].delete(AUTH_HEADER)
end

def convert_to_get?(response) 

def convert_to_get?(response)
  !%i[head options].include?(response.env[:method]) &&
    @convert_to_get.include?(response.status)
end

def follow_limit 

def follow_limit
  @options.fetch(:limit, FOLLOW_LIMIT)
end

def follow_redirect?(env, response) 

def follow_redirect?(env, response)
  ALLOWED_METHODS.include?(env[:method]) &&
    REDIRECT_CODES.include?(response.status)
end

def initialize(app, options = {})

redirects (default: true)
Authorization header should be cleared on
:clear_authorization_header - A Boolean indicating whether the request
all cookies (default: []).
cookies to be kept, or :all to keep
['cookie1', 'cookie2']) to choose
:cookies - An Array of Strings (e.g.
with the old and new envs
:callback - A callable used on redirects
(default: false)
the HTTP spec when following 301/302
:standards_compliant - A Boolean indicating whether to respect
:limit - A Numeric redirect limit (default: 3)
options - An options Hash (default: {}):

Public: Initialize the middleware. 
def initialize(app, options = {})
  super(app)
  @options = options
  @convert_to_get = Set.new [303]
  @convert_to_get << 301 << 302 unless standards_compliant?
end

def perform_with_redirection(env, follows) 

def perform_with_redirection(env, follows)
  request_body = env[:body]
  response = @app.call(env)
  response.on_complete do |response_env|
    if follow_redirect?(response_env, response)
      raise RedirectLimitReached, response if follows.zero?
      new_request_env = update_env(response_env.dup, request_body, response)
      callback&.call(response_env, new_request_env)
      response = perform_with_redirection(new_request_env, follows - 1)
    end
  end
  response
end

def redirect_to_same_host?(from_url, to_url) 

def redirect_to_same_host?(from_url, to_url)
  return true if to_url.start_with?('/')
  from_uri = URI.parse(from_url)
  to_uri = URI.parse(to_url)
  [from_uri.scheme, from_uri.host, from_uri.port] ==
    [to_uri.scheme, to_uri.host, to_uri.port]
end

def safe_escape(uri)

risk double-escaping.
URI:HTTP using the `+` operator. Doesn't escape "%" characters so to not
component only or a fully qualified URI so that it can be joined onto an
Internal: escapes unsafe characters from an URL which might be a path 
def safe_escape(uri)
  uri = uri.split('#')[0] # we want to remove the fragment if present
  uri.to_s.gsub(URI_UNSAFE) do |match|
    "%#{match.unpack('H2' * match.bytesize).join('%').upcase}"
  end
end

def standards_compliant? 

def standards_compliant?
  @options.fetch(:standards_compliant, false)
end

def update_env(env, request_body, response) 

def update_env(env, request_body, response)
  redirect_from_url = env[:url].to_s
  redirect_to_url = safe_escape(response['location'] || '')
  env[:url] += redirect_to_url
  ENV_TO_CLEAR.each { |key| env.delete key }
  if convert_to_get?(response)
    env[:method] = :get
    env[:body] = nil
  else
    env[:body] = request_body
  end
  clear_authorization_header(env, redirect_from_url, redirect_to_url)
  env
end