Spring Cloud实战小贴士：Zuul处理Cookie和重定向

public class RibbonRoutingFilter extends ZuulFilter {
	...
	protected ProxyRequestHelper helper;
	
	@Override
	public Object run() {
		RequestContext context = RequestContext.getCurrentContext();
		this.helper.addIgnoredHeaders();
		try {
			RibbonCommandContext commandContext = buildCommandContext(context);
			ClientHttpResponse response = forward(commandContext);
			setResponse(response);
			return response;
		}
		...
		return null;
	}
	
		protected RibbonCommandContext buildCommandContext(RequestContext context) {
		HttpServletRequest request = context.getRequest();

		MultiValueMap<String, String> headers = this.helper
				.buildZuulRequestHeaders(request);
		MultiValueMap<String, String> params = this.helper
				.buildZuulRequestQueryParams(request);
		...
	}
}

public class ProxyRequestHelper {

	public MultiValueMap<String, String> buildZuulRequestHeaders(
			HttpServletRequest request) {
		RequestContext context = RequestContext.getCurrentContext();
		MultiValueMap<String, String> headers = new HttpHeaders();
		Enumeration<String> headerNames = request.getHeaderNames();
		if (headerNames != null) {
			while (headerNames.hasMoreElements()) {
				String name = headerNames.nextElement();
				if (isIncludedHeader(name)) {
					Enumeration<String> values = request.getHeaders(name);
					while (values.hasMoreElements()) {
						String value = values.nextElement();
						headers.add(name, value);
					}
				}
			}
		}
		Map<String, String> zuulRequestHeaders = context.getZuulRequestHeaders();
		for (String header : zuulRequestHeaders.keySet()) {
			headers.set(header, zuulRequestHeaders.get(header));
		}
		headers.set(HttpHeaders.ACCEPT_ENCODING, "gzip");
		return headers;
	}

	public boolean isIncludedHeader(String headerName) {
		String name = headerName.toLowerCase();
		RequestContext ctx = RequestContext.getCurrentContext();
		if (ctx.containsKey(IGNORED_HEADERS)) {
			Object object = ctx.get(IGNORED_HEADERS);
			if (object instanceof Collection && ((Collection<?>) object).contains(name)) {
				return false;
			}
		}
		...
	}
}

public class PreDecorationFilter extends ZuulFilter {
	...
	public Object run() {
		RequestContext ctx = RequestContext.getCurrentContext();
		final String requestURI = this.urlPathHelper.getPathWithinApplication(ctx.getRequest());
		Route route = this.routeLocator.getMatchingRoute(requestURI);
		if (route != null) {
			String location = route.getLocation();
			if (location != null) {
				ctx.put("requestURI", route.getPath());
				ctx.put("proxy", route.getId());
              	 // 处理忽略头信息的部分
				if (!route.isCustomSensitiveHeaders()) {
					this.proxyRequestHelper.addIgnoredHeaders(
						this.properties.getSensitiveHeaders()
						.toArray(new String[0]));
				} else {
					this.proxyRequestHelper.addIgnoredHeaders(
						route.getSensitiveHeaders()
						.toArray(new String[0]));
				}
		...
}

@Data
@ConfigurationProperties("zuul")
public class ZuulProperties {
	private Set<String> sensitiveHeaders = new LinkedHashSet<>(
			Arrays.asList("Cookie", "Set-Cookie", "Authorization"));
	...
}