Rack::ContentTypeDefault

Rack::ContentTypeDefault is a tiny piece of middleware that sets default CONTENT-TYPE: header when it isn't present for specific requests. It checks if a content type is set and does not override the existing one.

The following options may be specified:

1. Request method(s) on which the content type is applied. The default value is post.
2. Desired content type. The default value is 'application/json'.
3. Paths on which the content type is applied. The default is all paths when none are specified.
4. A boolean value to indicate whether or not to apply 'application/xml' or 'application/json' if the path ends in .xml or .json, respectively. The default value is false.

The code has been copied and adapted from https://gist.github.com/tstachl/6264249

Add the following line to your application's Gemfile:

gem 'rack_content_type_default', '~> 1.0'

Examples:

require 'rack/content-type-default'
config.middleware.use Rack::ContentTypeDefault, :post, 'application/x-www-form-urlencoded'

require 'rack/content-type-default'
config.middleware.use Rack::ContentTypeDefault, [:get, :post], 'application/xml', '/authenticate.xml'

require 'rack/content-type-default'
config.middleware.use Rack::ContentTypeDefault, :post, 'application/json', ['/authenticate.json', '/show'], true

It is useful if you want to make your application opinionated about the content type it expects from clients when not provided. In addition it bridges a gap between test and production environments if the clients differ.