如何在Zuul帖子过滤器中获取响应正文? [英] How to get response body in Zuul post filter?
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问题描述
在post
过滤器中使用Zuul作为代理时,如何读取响应正文?
How it is possible to read a response body while using Zuul as a proxy in post
filter?
我正在尝试这样调用代码:
I am trying to call the code like this:
@Component
public class PostFilter extends ZuulFilter {
private static final Logger log = LoggerFactory.getLogger(PostFilter.class);
@Override
public String filterType() {
return "post";
}
@Override
public int filterOrder() {
return 2000;
}
@Override
public boolean shouldFilter() {
return true;
}
@Override
public Object run() {
RequestContext ctx = RequestContext.getCurrentContext();
ctx.getResponseBody(); // null
// cant't do this, cause input stream is used later in other filters and I got InputStream Closed exception
// GZIPInputStream gzipInputStream = new GZIPInputStream(stream);
return null;
}
}
推荐答案
我已经设法克服了这一点.该解决方案包括4个步骤:
I've managed to overcome this. The solution consists of 4 steps:
- 将
ctx.getResponseDataStream()
读入ByteArrayOutputStream - 将OutputStream复制到2个InputStreams.
- 使用其中之一进行自定义.
- 使用第二个重新分配上下文:
context.setResponseBody(inputStream)
- 从点1读取流会导致无法再次读取该流,因此,这种方式将传递尚未读取的新的新鲜流
- Read
ctx.getResponseDataStream()
into a ByteArrayOutputStream - Copy OutputStream to 2 InputStreams.
- Use one of it for your custom purposes.
- Use the second to reassign to context:
context.setResponseBody(inputStream)
- reading stream from point 1 would cause that the stream cannot be read again, so this way you're passing a new fresh stream that wasn't read yet
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