java 如何在 Spring MVC 中处理 HTTP 标头？
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How to handle HTTP headers in Spring MVC?
提问by AndreaNobili
in this period I am studying the Spring MVC showcase example. Now I am studying how Spring MVC requires data.
这期间我在研究Spring MVC的展示示例。现在我正在研究 Spring MVC 如何需要数据。
I have some difficulties to understand how HTTP Request header are handled.
我在理解 HTTP 请求标头的处理方式方面遇到了一些困难。
In pratcice I have the following link:
在实践中，我有以下链接：
<a id="header" class="textLink" href="<c:url value="/data/header" />">Header</a>
This link generate an HTTP Request towards the URL: "/data/header"
此链接生成一个指向 URL 的 HTTP 请求：“/data/header”
This is the method of the RequestDataController class that handles this HTTP Request (the entire class is annoted by @RequestMapping("/data"): so this method handle /data/header URL)
这是RequestDataController类处理这个HTTP请求的方法（整个类用@RequestMapping("/data")注解：所以这个方法处理/data/header URL）
@RequestMapping(value="header", method=RequestMethod.GET)
public @ResponseBody String withHeader(@RequestHeader String Accept) {
return "Obtained 'Accept' header '" + Accept + "'";
}
So the withHeader method take a parameter that is annoted by @RequestHeaderannotation that is an annotation which indicates that a method parameter should be bound to a web request header.
因此 withHeader 方法采用一个由@RequestHeader注释注释的参数，该注释指示方法参数应绑定到 Web 请求标头。
Ok, so my answer is: what exactly I have inside the Accept variable? The value of my HTTP Accetp Header? or what?
好的，所以我的答案是：我在 Accept 变量中到底有什么？我的 HTTP Accetp 标头的值？要不然是啥？
Fow what I know Accept request-header field can be used to specify certain media types which are acceptable for the response. Accept headers can be used to indicate that the request is specifically limited to a small set of desired types, as in the case of a request for an in-line image.
我所知道的 Accept 请求头字段可用于指定响应可接受的某些媒体类型。Accept 标头可用于指示请求仅限于一小组所需的类型，如请求内嵌图像的情况。
So my output (the returned value) is: Obtained 'Accept' header 'text/plain, /; q=0.01'
所以我的输出（返回值）是：获得 'Accept' header 'text/plain, /; q=0.01'
mmm...what it exactly means this Accept headers field value?
嗯……这个 Accept headers 字段值到底是什么意思？
Thank you
谢谢
Andrea
安德烈亚
回答by Biju Kunjummen
Yes, when you annotate a parameter with @RequestHeader, the parameter name is used for retrieving the header information - in your case that will be the header name of 'Accept'- the parameter name could have been acceptalso, the header names are retrieved in a case insensitive manner.
是的，当您使用@RequestHeader 注释参数时，参数名称用于检索标头信息-在您的情况下，这将是“接受”的标头名称-参数名称也可能是accept，标头名称在不区分大小写的方式。
You could have also explicitly specified the header name explicitly this way: @RequestHeader("Accept")
您还可以通过这种方式明确指定标头名称： @RequestHeader("Accept")
Accept header like you have indicated is a way for the client(browser) to say what it can accept as a media type of the response to be.
像您指出的那样接受标头是客户端（浏览器）说出它可以接受的响应媒体类型的一种方式。
