java – RestTemplate没有传递Origin头

发布时间：2020-12-14 05:55:47 所属栏目：Java 来源：网络整理

导读：我正在尝试使用 Spring的RestTemplate进行跨源请求.通信是在两个Spring-boot webapps之间完成的,这两个webapp都运行在localhost但不同的端口上.我所做的是： HttpHeaders httpHeaders = new HttpHeaders();httpHeaders.setOrigin("http://localhost:8083");h

我正在尝试使用 Spring的RestTemplate进行跨源请求.通信是在两个Spring-boot webapps之间完成的,这两个webapp都运行在localhost但不同的端口上.我所做的是：

HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setOrigin("http://localhost:8083");
httpHeaders.add("Authorization",token);

HttpEntity<Void> httpEntity = new HttpEntity<>(httpHeaders);

ParameterizedTypeReference<List<MyObj>> beanType = new ParameterizedTypeReference<List<MyObj>>() {};
ResponseEntity<List<MyObj>> list = restTemplate.exchange(serviceURL,HttpMethod.GET,httpEntity,beanType);

执行调用,“授权”标题传递得很好,但无论我尝试什么,接收端都没有“Origin”标题.
当我使用其他工具(SoapUI,RestClient Chrome插件等)创建一个simillar请求时,标题就像我提供的那样传递.

要在接收端打印所有标头,我正在使用javax.servlet.Filter的实现：

public void doFilter(ServletRequest req,ServletResponse res,FilterChain chain)
        throws IOException,ServletException {
    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    Enumeration<String> headerNames = request.getHeaderNames();
    while (headerNames.hasMoreElements()) {
        String headerName = headerNames.nextElement();
        log.info(headerName + ": " + request.getHeader(headerName));
    }
}

使用RestTemplate时为什么不传递origin头？

解决方法

有同样的问题,我花了一个世纪来修复.

根本原因是来自RestTemplate文档的这一行

Note: by default the RestTemplate relies on standard JDK facilities to establish HTTP connections.

如果您在Java中检查HttpUrlConnection类的源代码,您将在下面的代码块中找到,并且标头Origin是禁止更改的受限标头之一：

/*
 * Restrict setting of request headers through the public api
 * consistent with JavaScript XMLHttpRequest2 with a few
 * exceptions. Disallowed headers are silently ignored for
 * backwards compatibility reasons rather than throwing a
 * SecurityException. For example,some applets set the
 * Host header since old JREs did not implement HTTP 1.1.
 * Additionally,any header starting with Sec- is
 * disallowed.
 *
 * The following headers are allowed for historical reasons:
 *
 * Accept-Charset,Accept-Encoding,Cookie,Cookie2,Date,* Referer,TE,User-Agent,headers beginning with Proxy-.
 *
 * The following headers are allowed in a limited form:
 *
 * Connection: close
 *
 * See http://www.w3.org/TR/XMLHttpRequest2.
 */
 private static final boolean allowRestrictedHeaders;
 private static final Set<String> restrictedHeaderSet;
 private static final String[] restrictedHeaders = {
    /* Restricted by XMLHttpRequest2 */
    //"Accept-Charset",//"Accept-Encoding","Access-Control-Request-Headers","Access-Control-Request-Method","Connection",/* close is allowed */
    "Content-Length",//"Cookie",//"Cookie2","Content-Transfer-Encoding",//"Date",//"Expect","Host","Keep-Alive","Origin",// "Referer",// "TE","Trailer","Transfer-Encoding","Upgrade",//"User-Agent","Via"
};

只需设置JVM参数,就可以轻松解决此问题

-Dsun.net.http.allowRestrictedHeaders=true

或在代码中添加一行

System.setProperty("sun.net.http.allowRestrictedHeaders","true");

这抑制了限制.

（编辑：李大同）

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