[RUBY] [Rails] Try using Faraday middleware

I tried using Faraday middleware, so I will summarize it easily.

What is Faraday?

HTTP client library written in ruby You can use this to access external APIs from your Rails project.

What is Faraday middleware?

Faraday has middleware that allows you to customize request and response processing. There are two types, Request middleware and Response middleware. By using this, you can add authentication information at the time of request and write out the communication in the log.

You can use it as follows using symbols.

api_client.rb


Faraday.new(url: 'https://test.com') do |builder|
  #Use middleware
  builder.request :url_encoded
  builder.response :logger, Config.logger if Config.enable_logger
end

Request middleware

Request middleware can set the details of the request before sending the request. Here, we will introduce two middleware. Authentication middleware can set the Authorization header, UrlEncoded middleware can convert the hash of key / value pairs into a URL-encoded request body.

Example of use

api_client.rb


#Authentication middleware
builder.request :basic_auth, "username", "password"
builder.request : authorization :Basic, "aut_key"

#UrlEncoded middleware
builder.request :url_encoded

Response middleware

The response middleware can set the details of the response when it receives the response. Here, we will introduce Logger middleware. Logger middleware allows you to log request and response body and headers. It also has a filter function that allows you to filter sensitive information using regular expressions.

Example of use

api_client.rb


#Logger middleware
builder.response :logger
#filter
builder.response :logger do | logger |
  logger.filter(/(password=)(\w+)/, '\1[REMOVED]')
end

Even more convenient with faraday_middleware!

If you add a gem called faraday_middleware, you can use more middleware.

For example, you can use the ParseJson class and specify parser_options and content_type to parse the hash key as a symbol for JSON.

Example of use

api_client.rb


builder.response :json, parser_options: { symbolize_names: true }, content_type: 'application/json'

Reference document

https://lostisland.github.io/faraday/ https://lostisland.github.io/faraday/middleware/list

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