1、让我们看看这熟悉的报错

java.lang.IllegalStateException: No thread-bound request found: 
Are you referring to request attributes outside of an actual web request, 
or processing a request outside of the originally receiving thread? 
If you are actually operating within a web request and still receive this message, 
your code is probably running outside of DispatcherServlet: In this case, 
use RequestContextListener or RequestContextFilter to expose the current request.
2、我的使用场景
 
在@Async注解的方法里进行Feign调用，为什么会出现这个问题尼？是因为我@configurtion里加了这行代码，因为有业务需求我要从request里取到header里的参数 
HttpServletRequest request = ((ServletRequestAttributes) 
(RequestContextHolder.currentRequestAttributes())).getRequest();
3、那这个报错信息从何而来？
 
点进RequestContextHolder这个类，查看源码可知，RequestAttributes - 请求属性线程拿不到了，所以为null，然后就throw new IllegalStateException，以下为源码： 
	 * Return the RequestAttributes currently bound to the thread.
	 * <p>Exposes the previously bound RequestAttributes instance, if any.
	 * Falls back to the current JSF FacesContext, if any.
	 * @return the RequestAttributes currently bound to the thread
	 * @throws IllegalStateException if no RequestAttributes object
	 * is bound to the current thread
	 * @see #setRequestAttributes
	 * @see ServletRequestAttributes
	 * @see FacesRequestAttributes
	 * @see javax.faces.context.FacesContext#getCurrentInstance()
	public static RequestAttributes currentRequestAttributes() throws IllegalStateException {
		RequestAttributes attributes = getRequestAttributes();
		if (attributes == null) {
			if (jsfPresent) {
				attributes = FacesRequestAttributesFactory.getFacesRequestAttributes();
			if (attributes == null) {
				throw new IllegalStateException("No thread-bound request found: " +
						"Are you referring to request attributes outside of an actual web request, " +
						"or processing a request outside of the originally receiving thread? " +
						"If you are actually operating within a web request and still receive this message, " +
						"your code is probably running outside of DispatcherServlet: " +
						"In this case, use RequestContextListener or RequestContextFilter to expose the current request.");
		return attributes;
4、解决方法
 
 只需要在调用异步方法的外面将RequestAttributes对象设置为子线程共享即可。当然，我们要知道异步线程执行时，ThreadLocal - 线程上下文信息不会自动带过去。当然还有InheritableThreadLocal可以支持将线程上下文传入子线程。 
4.2、核心代码
 
ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
RequestContextHolder.setRequestAttributes(sra, true);
4.3、举个栗子
 
public void childThreadSharing(ScreeningDTO dto) {
	// 设置子线程共享
	ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    RequestContextHolder.setRequestAttributes(sra, true);
	// 开始执行异步方法
	this.somethingService.executeAsync();
                    No thread-bound request found: " +						"Are you referring to request attributes outside of an actual web request, " +						"or processing a request outside of the originally receiving thread?
				问题描述：
xxljob定时任务中写了一个线程池，每次调用定时任务，都会起7条线程，进行数据传输，程序运行时报错：java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attribu
bug原因：
线程池中的子线程获取不到定时任务主线程的request信息
解决方法：
在定义线程池之前加入两行代码，设置request子线程共享
// 子线程request共享
ServletRe
				Android异常详情介绍
这种异常我遇到以下两种情况： 
1. java.lang.IllegalStateException: No wrapped connection. 
2.java.lang.IllegalStateException: Adapter is detached.
1.单线程一次执行一个请求可以正常执行，如果使用多线程，同时执行多个请求时就会出现连接超时. 
2.HttpConnection没有连接池的概念，多少次请求就会建立多少个IO，在访问量巨大的情况下服务器的IO可能会耗尽。 
3.通常是因为HttpClient访问单一实例的不同的线程或未关闭Input
					解决No thread-bound request found: Are you referring to request attributes outside of an actual web re
					java.lang.illegalstateexception: no thread-bound request found: are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? if you are actually operating within a web request and still receive this message, your code is probably running outside of dispatcherservlet: in this case, use requestcontextlistener or requestcontextfilter to expose the current request.