如何在Struts2拦截器中配置HTTP响应头？ [英] How can I configure HTTP Response Headers in a Struts2 Interceptor?

问题描述

我们目前在从Struts 1迁移到Struts 2的过程中有一个java Web应用程序。我们想配置 X-Frame-Options 和所有Struts 2操作的Content-Security-Policy 标头。我们有很多动作，如果可能的话，我想避免单独修改它们。

We currently have a java web application in the middle of migration from Struts 1 to Struts 2. We would like to configure X-Frame-Options and Content-Security-Policy headers for all our Struts 2 actions. We have a lot of actions and I want to avoid modifying them all separately if at all possible.

我目前拥有的想法是以下拦截器，它将被添加到默认堆栈：

the idea I currently have is the following interceptor which would be added to the default stack:

import javax.servlet.http.HttpServletResponse;    
import org.apache.struts2.ServletActionContext;    
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class HttpHeaderInterceptor implements Interceptor {

    private static final long serialVersionUID = 1L;

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
    }

    @Override
    public void init() {
        // TODO Auto-generated method stub
    }

    @Override
    public String intercept(ActionInvocation Invocation) throws Exception {
        HttpServletResponse response = ServletActionContext.getResponse();
        response.addHeader("X-Frame-Options", "SAMEORIGIN");
        response.addHeader("Content-Security-Policy-Report-Only", "default-src 'self'; script-src 'self' 'unsafe-inline'; object-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self'; media-src 'none'; frame-src 'none'; font-src 'self'; connect-src 'self'; report-uri REDACTED");
        response.addHeader("X-Content-Security-Policy-Report-Only", "default-src 'self'; script-src 'self' 'unsafe-inline'; object-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self'; media-src 'none'; frame-src 'none'; font-src 'self'; connect-src 'self'; report-uri REDACTED");
        return Invocation.invoke();
    }
}

我尝试了以上操作，但它不起作用，它没有设置标题。

I tried the above, and it does not work, it does not set the headers.

我需要做些什么修改来修复这个拦截器？是否有可能以这种方式更改响应头？

What changes do I need to make to fix this interceptor? Is it even possible to change response headers in this way?

推荐答案

获取响应（和请求）的正确方法拦截器内部是通过 InvocationContext ，而不是通过 ServletActionContext ：

The correct way to get the the response (and the request) inside an Interceptor is through the InvocationContext, instead that through the ServletActionContext:

public String intercept(ActionInvocation Invocation) throws Exception {

    final ActionContext ac = invocation.getInvocationContext();
    HttpServletResponse response = (HttpServletResponse) ac.get(StrutsStatics.HTTP_RE‌​SPONSE);
    //HttpServletResponse response = ServletActionContext.getResponse();

    response.addHeader("X-Frame-Options", "SAMEORIGIN");
    response.addHeader("Content-Security-Policy-Report-Only", "default-src 'self'; script-src 'self' 'unsafe-inline'; object-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self'; media-src 'none'; frame-src 'none'; font-src 'self'; connect-src 'self'; report-uri REDACTED");
    response.addHeader("X-Content-Security-Policy-Report-Only", "default-src 'self'; script-src 'self' 'unsafe-inline'; object-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self'; media-src 'none'; frame-src 'none'; font-src 'self'; connect-src 'self'; report-uri REDACTED");
    return Invocation.invoke();
}

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