"x-ec-custom-error:1"；这是什么意思? [英] "x-ec-custom-error: 1" What does it mean?

问题描述

在研究HTTP协议时，我在响应标头字段中看到了这一点:

While studying the HTTP protocol, I saw this in a response header field:

x-ec-custom-error: 1

我正在使用netcat通过代理连接获取example.com的主页.

I was using netcat to get example.com's main page through a proxy connection.

以下是所有控制台通信，其中出现了此标头:

Here is all console comunication where this header appears:

$ nc -x (omitted proxy address):3128 -Xconnect www.example.com 80
GET http://www.example.com/ HTTP/1.1
Host: www.example.com

HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=604800
Content-Type: text/html
Date: Fri, 07 Mar 2014 20:08:45 GMT
Etag: "359670651"
Expires: Fri, 14 Mar 2014 20:08:45 GMT
Last-Modified: Fri, 09 Aug 2013 23:54:35 GMT
Server: ECS (iad/19AB)
X-Cache: HIT
x-ec-custom-error: 1                                <----------------HERE
Content-Length: 1270

(Omitted message body)

注意到后，我尝试在Google和此网站上进行详尽的搜索，但找不到任何答案，也没有与我讨论这个问题的人.

After noticing it, I tried searching thouroughly on google and on this site but I didn't find the answer anywhere, nor did the people who were discussing this with me.

提前感谢所有答案.

推荐答案

X-前缀标头是非标准标头，通常特定于所使用的特定软件.

X- prefixed headers are nonstandard headers that are often specific to the particular software in use.

ECS(iad/19AB) Server 标头显示EdgeCast(现为Verizon Digital Media Services)CDN正在从其IAD(弗吉尼亚州)提供内容存在点.

The ECS (iad/19AB) Server header shows that the content is being served by the EdgeCast (now Verizon Digital Media Services) CDN from their IAD (Virginia) point of presence.

x-ec-custom-error 中的 ec 很可能代表EdgeCast，但标头的整体含义并未公开记录，可能特定于应用程序.

The ec in x-ec-custom-error very likely stands for EdgeCast, but the meaning of the header as a whole isn't publicly documented and is probably application-specific.

但是，有一种理论认为， example.com 上的所有可能的HTTP状态代码都将替换为自定义错误页面，并且此标头就是对此的一种指示.因此，无论原始服务器返回的是 200 OK 还是 404 Not Found ，EdgeCast都配置为用预定义的响应替换页面内容.

One theory though is that every possible HTTP status code on example.com is being replaced with a custom error page, and that this header is an indicator of that. So regardless of whether the origin server returns a 200 OK or 404 Not Found, EdgeCast is configured to replace the page contents with a predefined response.

$ curl -i http://example.com/asdfsdfasf
HTTP/1.1 404 Not Found
Server: ECS (oxr/83C7)
X-Cache: HIT
x-ec-custom-error: 1

$ curl -i http://example.com/
HTTP/1.1 200 OK
Server: ECS (ftw/FBE4)
X-Cache: HIT
x-ec-custom-error: 1

(此外， X-Cache:HIT 标头告诉您该页面是在EdgeCast的缓存中找到的，并直接从它们提供服务.)

(Also, the X-Cache: HIT header tells you that the page was found in EdgeCast's cache and was served directly from them.)

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