问题：

使用httpClient连续请求Server服务时候，第一次成功，第二次失败，第三次成功，依次交替成功失败。

报错：

ERROR o.a.c.c.C.[.[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on PUT request for "http://192.168.0.45:20480/testenvbucketaggregation/20200602131200003-010": Software caused connection abort: recv failed; nested exception is java.net.SocketException: Software caused connection abort: recv failed] with root cause
java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:735)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1587)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at org.springframework.http.client.SimpleClientHttpResponse.getRawStatusCode(SimpleClientHttpResponse.java:55)
at org.springframework.web.client.DefaultResponseErrorHandler.hasError(DefaultResponseErrorHandler.java:55)
at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:773)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:743)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:677)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:586)

原因：

客户端以为是长连接，服务端是短链接，所以客户端第二次请求出错。

解决：

在httpClient 请求头部添加 Connection：Close，显示设置为短连接接，每次请求完关闭连接，下次请求重新建立连接。

分析：

可能是httpClient和服务端的协议版本不匹配，交互过程没有协商长短连接，需要显示设置。