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--- layout: post title: Rails中的request category: ruby --- 每个web请求都有对应的 Request和Response，在Rails中，我们如何获取关于request的信息呢？ ### Request对象 在controller的实例中，可以通过request方法获取request对象 ```ruby request # => ActionDispatch::Request对象 ``` ## Request对象包含的内容 ### Headers ```ruby request.headers # => #<ActionDispatch::Http::Headers:0x007ff849c55a50> ``` headers分为： `request.headers` `response.headers` ### Params ```ruby request.params # => ActiveSupport::HashWithIndifferentAccess对象 request.parameters # 同request.params request.path_parameters ``` `params` 返回的是 ActionController::Parameters 对象 ### Method ```ruby request.method # => "GET"，String对象 request.method_symbol # => :get，Symbol对象 request.request_method_symbol request.get? request.post? request.put? request.patch? request.delete? request.head? ``` ### Url ```ruby request.fullpath request.original_fullpath request.original_url ``` ### 请求内容 ```ruby request.body # => StringIO对象 request.body_stream request.raw_post request.form_data? request.xml_http_request? request.authorization ``` ### MIME等信息 ```ruby request.media_type request.accepts request.content_type request.formats request.format request.variant ``` ### 客户端、服务端、中间件信息 ```ruby request.ip request.remote_ip request.local? request.uuid request.server_software ``` ### 缓存相关信息 ```ruby request.if_modified_since request.if_none_match request.if_none_match_etags ```
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