Rack :: Request - 如何获取所有标题？ [英] Rack::Request - how do I get all headers?

问题描述

标题非常明显。有没有办法得到标题（除了 Rack :: Request.env [] ）？

The title is pretty self-explanatory. Is there any way to get the headers (except for Rack::Request.env[])?

推荐答案

HTTP标头在传递给您的应用的 Rack环境中可用：

The HTTP headers are available in the Rack environment passed to your app:

HTTP _ 变量：对应于客户端提供的HTTP请求标头的变量（即，名称以HTTP_开头的变量。这些变量的存在与否应与请求中是否存在适当的HTTP标头相对应。

HTTP_ Variables: Variables corresponding to the client-supplied HTTP request headers (i.e., variables whose names begin with HTTP_). The presence or absence of these variables should correspond with the presence or absence of the appropriate HTTP header in the request.

因此HTTP标头以HTTP_为前缀并添加到哈希。

So the HTTP headers are prefixed with "HTTP_" and added to the hash.

这是一个提取并显示它们的小程序：

Here's a little program that extracts and displays them:

require 'rack'

app = Proc.new do |env|
  headers = env.select {|k,v| k.start_with? 'HTTP_'}
    .collect {|key, val| [key.sub(/^HTTP_/, ''), val]}
    .collect {|key, val| "#{key}: #{val}<br>"}
    .sort
  [200, {'Content-Type' => 'text/html'}, headers]
end

Rack::Server.start :app => app, :Port => 8080

当我运行此功能时，除了Chrome或Firefox所示的HTTP标头之外，还有VERSION：HTPP / 1.1（即带有键HTTP_VERSION和值HTTP / 1.1的条目被添加到env哈希）。

When I run this, in addition to the HTTP headers as shown by Chrome or Firefox, there is a "VERSION: HTPP/1.1" (i.e. an entry with key "HTTP_VERSION" and value "HTTP/1.1" is being added to the env hash).

这篇关于Rack :: Request - 如何获取所有标题？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！