【每日鲜蘑】异常`org.apache.http.NoHttpResponseException`解决
这是HTTP引起的异常，属于偶然发生异常。
异常日志
org.apache.http.NoHttpResponseException: The target server failed to respond
复制代码解决方案
服务端方案
客户端可以检测到服务已经过期了，主动关闭。
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追踪代码我们可以看到是 client 是从 HttpHeader 中读取 Keep-Alive: timeout=xx，如果没有读到就认为永不超时。
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而 Nginx 配置的第二个参数就是这个，因此只要服务端将 keepalive_timeout 30s;改为 keepalive_timeout 30s 29s;即可，这里少 1s 为了防止网络延时造成的并发问题。
客户端方案
如果服务端不方便修改，那么第二方案是客户端这边修改，比较麻烦。
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首先保证用最新的
httpClient。 -
其次有三种方法:
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jest closeIdleConnection keep alive
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根据
keep Alive时间，调整validateAfterInactivity 小于keepAlive Time`,但这种方法依旧不能避免同时关闭。 -
Retry HttpClient disableAutomaticRetries
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推荐的方案
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客户端使用短连接，比如换成
UrlConnection； -
HttpClient nginx keepalive_timeout
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不用
PoolingHttpClientConnectionManager； -
出错后重试，
HttpClient的RetryHandler； -
JDK11已经带了
HttpClinet,这不吸引人么？
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