如何在 Apache Camel 中设置 Cache-Control 标头答案

【问题标题】：How to set Cache-Control headers in Apache Camel如何在 Apache Camel 中设置 Cache-Control 标头
【发布时间】：2015-09-09 15:05:35
【问题描述】：

我使用的是 Apache camel 2.15.1 版本。在这我使用 servlet 组件来休息 dsl。我的简单路线如下所示

from(rest:get:CustomerDetails.json) .to("http://localhost:8080/customer/getCustomerDetails?bridgeEndpoint=true");

我需要为响应设置 Cache-Control 和 Pragma 标头。

from(rest:get:CustomerDetails.json) .to("http://localhost:8080/customer/getCustomerDetails?bridgeEndpoint=true") .setHeader("Cache-Control",constant("private, max-age=0,no-store"));

但是骆驼忽略了这一点。我读了一些其他建议使用自定义 HeaderFilterStrategy 的博客。我也试过这个。它没有帮助。

https://access.redhat.com/documentation/en-US/Red_Hat_JBoss_Fuse/6.0/html/Web_Services_and_Routing_with_Camel_CXF/files/Proxying-Headers.html

https://issues.apache.org/jira/browse/CAMEL-6085

非常感谢任何解决此问题的帮助。

【问题讨论】：

标签： apache-camel cache-control

【解决方案1】：

您可以让它与自定义 HeaderFilterStrategy 一起使用。诀窍是在 restConfiguration().endpointProperties(..) 中配置它，如下所示：

public void configure() {
    JndiRegistry registry = getContext().getRegistry(JndiRegistry.class);
    registry.bind("filter", new HeaderFilter());

    restConfiguration()
    .host("localhost")
    .endpointProperty("headerFilterStrategy","#filter")
    .setPort("10000");

    from("rest:get:hello")
    .to("http://localhost:20000?bridgeEndpoint=true")
    .setHeader("Cache-Control",constant("private, max-age=0,no-store"));

    from("netty-http:http://localhost:20000")
    .setBody(constant("ok"));
}

#filter 只是像这样的虚拟实现（您可以创建一个更适合您需求的过滤器）

public class HeaderFilter implements HeaderFilterStrategy {

    @Override
    public boolean applyFilterToCamelHeaders(String arg0, Object arg1, Exchange arg2) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean applyFilterToExternalHeaders(String arg0, Object arg1, Exchange arg2) {
        // TODO Auto-generated method stub
        return false;
    }

}

现在如果运行我的路线 without .endpointProperty("headerFilterStrategy","#filter") 行我会得到这样的输出

$ curl -D - http://localhost:10000/hello
HTTP/1.1 200 OK
Accept: */*
breadcrumbId: ID-myhost-40508-1441899753215-0-1
User-Agent: curl/7.35.0
Content-Length: 2
Connection: keep-alive

ok

和 with .endpointProperty("headerFilterStrategy","#filter") 这样的行输出

$ curl -D - http://localhost:10000/hello
HTTP/1.1 200 OK
Accept: */*
breadcrumbId: ID-myhost-56308-1441899833287-0-1
Cache-Control: private, max-age=0,no-store
CamelHttpMethod: GET
CamelHttpResponseCode: 200
CamelHttpUri: /hello
CamelHttpUrl: http://localhost:10000/hello
CamelNettyChannelHandlerContext: org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext@1fac34b
CamelNettyLocalAddress: /127.0.0.1:10000
CamelNettyMessageEvent: [id: 0x93dfe147, /127.0.0.1:35302 => /127.0.0.1:10000] RECEIVED: DefaultHttpRequest(chunked: false) GET /hello HTTP/1.1 User-Agent: curl/7.35.0 Host: localhost:10000 Accept: */*
CamelNettyRemoteAddress: /127.0.0.1:35302
User-Agent: curl/7.35.0
Content-Length: 2
Connection: keep-alive

ok

【讨论】：