使用Ruby的Net：HTTP保留HTTP头中的大小写 [英] Preserving case in HTTP headers with Ruby's Net:HTTP

问题描述

虽然HTTP规范说标题不区分大小写; Paypal及其新的自适应支付API要求其标题区分大小写。

Although the HTTP spec says that headers are case insensitive; Paypal, with their new adaptive payments API require their headers to be case-sensitive.

使用PayPal自适应支付扩​​展程序为ActiveMerchant（ http://github.com/lamp/paypal_adaptive_gateway ）虽然标题设置在所有大写字母中，但它们是以大小写形式发送的。

Using the paypal adaptive payments extension for ActiveMerchant (http://github.com/lamp/paypal_adaptive_gateway) it seems that although the headers are set in all caps, they are sent in mixed case.

以下是发送HTTP请求的代码：

Here is the code that sends the HTTP request:

headers = {
  "X-PAYPAL-REQUEST-DATA-FORMAT" => "XML",
  "X-PAYPAL-RESPONSE-DATA-FORMAT" => "JSON",
  "X-PAYPAL-SECURITY-USERID" => @config[:login],
  "X-PAYPAL-SECURITY-PASSWORD" => @config[:password],
  "X-PAYPAL-SECURITY-SIGNATURE" => @config[:signature],
  "X-PAYPAL-APPLICATION-ID" => @config[:appid]
}
build_url action

request = Net::HTTP::Post.new(@url.path)

request.body = @xml
headers.each_pair { |k,v| request[k] = v }
request.content_type = 'text/xml'

proxy = Net::HTTP::Proxy("127.0.0.1", "60723")

server = proxy.new(@url.host, 443)
server.use_ssl = true

server.start { |http| http.request(request) }.body

（我添加了代理行，所以我可以看到是什么继续与查尔斯 - http://www.charlesproxy.com/ ）

(i added the proxy line so i could see what was going on with Charles - http://www.charlesproxy.com/)

当我查看查尔斯的请求标题时，这就是我所看到的：

When I look at the request headers in charles, this is what i see:

X-Paypal-Application-Id ...
X-Paypal-Security-Password...
X-Paypal-Security-Signature ...
X-Paypal-Security-Userid ...
X-Paypal-Request-Data-Format XML
X-Paypal-Response-Data-Format JSON
Accept */*
Content-Type text/xml
Content-Length 522
Host svcs.sandbox.paypal.com

我确认它是不是Charles通过使用curl运行类似的请求来进行大小写转换。在该测试中，案例被保留。

I verified that it is not Charles doing the case conversion by running a similar request using curl. In that test the case was preserved.

推荐答案

RFC确实指定标题键是不区分大小写，所以不幸的是，您似乎遇到了PayPal API的烦人需求。

The RFC does specify that header keys are case-insensitive, so unfortunately you seem to have hit an annoying requirement with the PayPal API.

Net :: HTTP正在改变这种情况，虽然我很惊讶它们并非全都下降：

Net::HTTP is what is changing the case, although I'm surprised they're not all getting downcased:

# File net/http.rb, line 1160
    def []=(key, val)
      unless val
        @header.delete key.downcase
        return val
      end
      @header[key.downcase] = [val]
    end

设置与不区分大小写的键对应的标题字段。

"Sets the header field corresponding to the case-insensitive key."

由于上面是一个简单的类，它可能是猴子修补。我会进一步思考一个更好的解决方案。

As the above is a simple class it could be monkey-patched. I will think further for a nicer solution.

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