Apache httpclient 4.x 302 重定向并关闭 keepalive？
Apache httpclient 4.x 302 redirects with keepalive off?
我一直在尝试使用 HttpClient 4.4.1 (GA) 向服务器发出 HTTP GET 请求，该服务器 returns 具有重定向路径的 302。我在不使用 keepalive 时遇到一些问题，无法使其无缝运行。
这是我的代码：
HttpGet httpget = new HttpGet("http://10.104.107.22:1354/video/Manifest");
Header header = new BasicHeader(HttpHeaders.CONNECTION,
"close");
ArrayList<Header> headers = new ArrayList<>();
headers.add(header);
CloseableHttpClient client = HttpClients.custom().setDefaultHeaders(headers).build();
HttpEntity entity = null;
CloseableHttpResponse response = client.execute(httpget);
try{
entity = response.getEntity();
if (entity != null) {
long len = entity.getContentLength();
if (len != -1 && len < 2048) {
responseBody = EntityUtils.toString(entity);
}
else {
InputStream instream = entity.getContent();
try {
StringWriter writer = new StringWriter();
IOUtils.copy(instream, writer, "UTF-8");
responseBody = writer.toString();
} finally {
instream.close();
}
}
}
}
finally{
EntityUtils.consume(entity);
response.close();
client.close();
}
非常简单。
收到 GET 请求时，服务器响应
HTTP/1.1 302 Moved Temporarily
Content-Length: 0
Location: http://10.104.107.22:1354/video/Manifest?sessionID=250849653588053716653279720260905006780
Date: Mon, 06 Apr 2015 19:18:42 GMT
太棒了，现在我们知道要去哪里了。问题是，httpclient 然后抱怨错误：
Apr 08, 2015 2:39:29 PM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (org.apache.http.NoHttpResponseException) caught when processing request to /127.0.0.1->{}->http://10.104.107.22:1354: The target server failed to respond
Apr 08, 2015 2:39:29 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to /127.0.0.1->{}->http://10.104.107.22:1354
正如其言，然后它会重试从 IOException 中恢复并在同一连接中发送另一个带有重定向 URL 的请求！
GET /video/Manifest?sessionID=250849653588053716653279720260905006780 HTTP/1.1
Connection: close
Host: 10.104.107.22:1354
User-Agent: Apache-HttpClient/4.4.1 (Java 1.5 minimum; Java/1.7.0_55)
Accept-Encoding: gzip,deflate
现在，由于我们从一开始就将 "Connection: close" 指定为 header，因此服务器会在此时赶上并关闭其端的套接字。然后我的客户收到一个 RST 信号。为重定向的 Url 再次重新发送请求，这次一切正常。
我要解决的问题是如何阻止客户端在同一连接中发送重定向请求。我设法 "solve" 通过在 CloseableHttpClient object 上使用 disableRedirectHandling() 的第一个请求后禁用重定向，然后在单独的连接中自己处理 302 响应。如果我使用 keepAlive 来处理这个问题，事情也能正常工作，尽管我必须在完成后使用 ConnectionKeepAliveStrategy 策略使客户端套接字超时。
HttpClient 4.4.1 有没有办法自动处理单独请求中的 302 重定向？
编辑：按要求发布 GET 请求的完整通信。
GET /video/Manifest HTTP/1.1
Connection: close
Host: 10.104.107.22:1354
User-Agent: Apache-HttpClient/4.4.1 (Java 1.5 minimum; Java/1.7.0_55)
Accept-Encoding: gzip,deflate
HTTP/1.1 302 Moved Temporarily
Content-Length: 0
Location: http://10.104.107.22:1354/video/Manifest?sessionID=250849653588053716653279720260905006780
Date: Wed, 08 Apr 2015 14:36:42 GMT
GET /video/Manifest?sessionID=250849653588053716653279720260905006780 HTTP/1.1
Connection: close
Host: 10.104.107.22:1354
User-Agent: Apache-HttpClient/4.4.1 (Java 1.5 minimum; Java/1.7.0_55)
Accept-Encoding: gzip,deflate
然后我从服务器获得了 RST 信号。
Header Wire + 上下文日志记录。
2015/04/08 15:57:25:657 EDT [DEBUG] RequestAddCookies - CookieSpec selected: default
2015/04/08 15:57:25:667 EDT [DEBUG] RequestAuthCache - Auth cache not set in the context
2015/04/08 15:57:25:668 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection request: [route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
2015/04/08 15:57:25:679 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection leased: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:681 EDT [DEBUG] MainClientExec - Opening connection /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:683 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connecting to /10.104.107.22:1354
2015/04/08 15:57:25:686 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connection established 127.0.0.1:46323<->10.104.107.22:1354
2015/04/08 15:57:25:686 EDT [DEBUG] MainClientExec - Executing request GET /video/Manifest HTTP/1.1
2015/04/08 15:57:25:686 EDT [DEBUG] MainClientExec - Target auth state: UNCHALLENGED
2015/04/08 15:57:25:687 EDT [DEBUG] MainClientExec - Proxy auth state: UNCHALLENGED
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> GET /video/Manifest HTTP/1.1
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> Connection: close
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> Host: 10.104.107.22:1354
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.4.1 (Java/1.7.0_55)
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << HTTP/1.1 302 Moved Temporarily
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << Content-Length: 0
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Location: http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Date: Wed, 08 Apr 2015 19:57:25 GMT
2015/04/08 15:57:25:707 EDT [DEBUG] MainClientExec - Connection can be kept alive indefinitely
2015/04/08 15:57:25:707 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354] can be kept alive indefinitely
2015/04/08 15:57:25:707 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection released: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:709 EDT [DEBUG] DefaultRedirectStrategy - Redirect requested to location 'http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850'
2015/04/08 15:57:25:713 EDT [DEBUG] RedirectExec - Redirecting to 'http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850' via /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:714 EDT [DEBUG] RequestAddCookies - CookieSpec selected: default
2015/04/08 15:57:25:714 EDT [DEBUG] RequestAuthCache - Auth cache not set in the context
2015/04/08 15:57:25:714 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection request: [route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:715 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection leased: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:715 EDT [DEBUG] MainClientExec - Executing request GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:715 EDT [DEBUG] MainClientExec - Target auth state: UNCHALLENGED
2015/04/08 15:57:25:716 EDT [DEBUG] MainClientExec - Proxy auth state: UNCHALLENGED
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> Connection: close
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> Host: 10.104.107.22:1354
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.4.1 (Java/1.7.0_55)
2015/04/08 15:57:25:717 EDT [DEBUG] headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
2015/04/08 15:57:25:717 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-0: Close connection
2015/04/08 15:57:25:718 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-0: Shutdown connection
2015/04/08 15:57:25:718 EDT [DEBUG] MainClientExec - Connection discarded
2015/04/08 15:57:25:718 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-0: Close connection
2015/04/08 15:57:25:718 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection released: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
2015/04/08 15:57:25:718 EDT [INFO] RetryExec - I/O exception (org.apache.http.NoHttpResponseException) caught when processing request to /127.0.0.1->{}->http://10.104.107.22:1354: The target server failed to respond
2015/04/08 15:57:25:718 EDT [DEBUG] RetryExec - The target server failed to respond <org.apache.http.NoHttpResponseException: The target server failed to respond>org.apache.http.NoHttpResponseException: The target server failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:143)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:261)
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:165)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:167)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:272)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:124)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:271)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
at WorkingNonKeepAliveUseCase.requestWithoutKeepAlive(WorkingNonKeepAliveUseCase.java:109)
at Runner.main(Runner.java:13)
2015/04/08 15:57:25:720 EDT [INFO] RetryExec - Retrying request to /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:720 EDT [DEBUG] RequestAddCookies - CookieSpec selected: default
2015/04/08 15:57:25:720 EDT [DEBUG] RequestAuthCache - Auth cache not set in the context
2015/04/08 15:57:25:720 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection request: [route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
2015/04/08 15:57:25:721 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection leased: [id: 1][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Opening connection /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:721 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connecting to /10.104.107.22:1354
2015/04/08 15:57:25:721 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connection established 127.0.0.1:40753<->10.104.107.22:1354
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Executing request GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Target auth state: UNCHALLENGED
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Proxy auth state: UNCHALLENGED
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> Connection: close
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> Host: 10.104.107.22:1354
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> User-Agent: Apache-HttpClient/4.4.1 (Java/1.7.0_55)
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> Accept-Encoding: gzip,deflate
2015/04/08 15:57:25:792 EDT [DEBUG] headers - http-outgoing-1 << HTTP/1.1 200 OK
2015/04/08 15:57:25:792 EDT [DEBUG] headers - http-outgoing-1 << Content-Length: 17090
2015/04/08 15:57:25:792 EDT [DEBUG] headers - http-outgoing-1 << Pragma: no-cache
2015/04/08 15:57:25:793 EDT [DEBUG] headers - http-outgoing-1 << Cache-Control: max-age=0, no-cache, no-store
2015/04/08 15:57:25:793 EDT [DEBUG] headers - http-outgoing-1 << Content-Type: application/vnd.ms-sstr+xml
2015/04/08 15:57:25:793 EDT [DEBUG] headers - http-outgoing-1 << Date: Wed, 08 Apr 2015 19:57:25 GMT
2015/04/08 15:57:25:794 EDT [DEBUG] MainClientExec - Connection can be kept alive indefinitely
2015/04/08 15:57:26:795 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection [id: 1][route: /127.0.0.1->{}->http://10.104.107.22:1354] can be kept alive indefinitely
2015/04/08 15:57:26:796 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection released: [id: 1][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:26:796 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection manager is shutting down
2015/04/08 15:57:26:796 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-1: Close connection
2015/04/08 15:57:26:797 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-1: Close connection
2015/04/08 15:57:26:797 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection manager shut down
问题出在这部分
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << HTTP/1.1 302 Moved Temporarily
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << Content-Length: 0
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Location: http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Date: Wed, 08 Apr 2015 19:57:25 GMT
服务器发回的重定向响应没有任何服务器打算之后关闭连接的线索。 HttpClient 尽职地 returns 将连接返回到池中，并将其取回以处理导致 I/O 错误的重定向。
完全禁用连接持久性真的有充分的理由吗？我认为您最好让 HttpClient 为同一会话重新使用连接，然后在会话结束后立即从连接池中逐出所有持久连接。
来自 Oleg Kalnichevski 的后续评论。
HttpClient expects the opposite endpoint to explicitly state its intent and send 'Connection: close' if it intends to drop the connection.
这解决了我的问题。
我一直在尝试使用 HttpClient 4.4.1 (GA) 向服务器发出 HTTP GET 请求，该服务器 returns 具有重定向路径的 302。我在不使用 keepalive 时遇到一些问题，无法使其无缝运行。
这是我的代码：
HttpGet httpget = new HttpGet("http://10.104.107.22:1354/video/Manifest");
Header header = new BasicHeader(HttpHeaders.CONNECTION,
"close");
ArrayList<Header> headers = new ArrayList<>();
headers.add(header);
CloseableHttpClient client = HttpClients.custom().setDefaultHeaders(headers).build();
HttpEntity entity = null;
CloseableHttpResponse response = client.execute(httpget);
try{
entity = response.getEntity();
if (entity != null) {
long len = entity.getContentLength();
if (len != -1 && len < 2048) {
responseBody = EntityUtils.toString(entity);
}
else {
InputStream instream = entity.getContent();
try {
StringWriter writer = new StringWriter();
IOUtils.copy(instream, writer, "UTF-8");
responseBody = writer.toString();
} finally {
instream.close();
}
}
}
}
finally{
EntityUtils.consume(entity);
response.close();
client.close();
}
非常简单。
收到 GET 请求时，服务器响应
HTTP/1.1 302 Moved Temporarily
Content-Length: 0
Location: http://10.104.107.22:1354/video/Manifest?sessionID=250849653588053716653279720260905006780
Date: Mon, 06 Apr 2015 19:18:42 GMT
太棒了，现在我们知道要去哪里了。问题是，httpclient 然后抱怨错误：
Apr 08, 2015 2:39:29 PM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (org.apache.http.NoHttpResponseException) caught when processing request to /127.0.0.1->{}->http://10.104.107.22:1354: The target server failed to respond
Apr 08, 2015 2:39:29 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to /127.0.0.1->{}->http://10.104.107.22:1354
正如其言，然后它会重试从 IOException 中恢复并在同一连接中发送另一个带有重定向 URL 的请求！
GET /video/Manifest?sessionID=250849653588053716653279720260905006780 HTTP/1.1
Connection: close
Host: 10.104.107.22:1354
User-Agent: Apache-HttpClient/4.4.1 (Java 1.5 minimum; Java/1.7.0_55)
Accept-Encoding: gzip,deflate
现在，由于我们从一开始就将 "Connection: close" 指定为 header，因此服务器会在此时赶上并关闭其端的套接字。然后我的客户收到一个 RST 信号。为重定向的 Url 再次重新发送请求，这次一切正常。
我要解决的问题是如何阻止客户端在同一连接中发送重定向请求。我设法 "solve" 通过在 CloseableHttpClient object 上使用 disableRedirectHandling() 的第一个请求后禁用重定向，然后在单独的连接中自己处理 302 响应。如果我使用 keepAlive 来处理这个问题，事情也能正常工作，尽管我必须在完成后使用 ConnectionKeepAliveStrategy 策略使客户端套接字超时。
HttpClient 4.4.1 有没有办法自动处理单独请求中的 302 重定向？
编辑：按要求发布 GET 请求的完整通信。
GET /video/Manifest HTTP/1.1
Connection: close
Host: 10.104.107.22:1354
User-Agent: Apache-HttpClient/4.4.1 (Java 1.5 minimum; Java/1.7.0_55)
Accept-Encoding: gzip,deflate
HTTP/1.1 302 Moved Temporarily
Content-Length: 0
Location: http://10.104.107.22:1354/video/Manifest?sessionID=250849653588053716653279720260905006780
Date: Wed, 08 Apr 2015 14:36:42 GMT
GET /video/Manifest?sessionID=250849653588053716653279720260905006780 HTTP/1.1
Connection: close
Host: 10.104.107.22:1354
User-Agent: Apache-HttpClient/4.4.1 (Java 1.5 minimum; Java/1.7.0_55)
Accept-Encoding: gzip,deflate
然后我从服务器获得了 RST 信号。
Header Wire + 上下文日志记录。
2015/04/08 15:57:25:657 EDT [DEBUG] RequestAddCookies - CookieSpec selected: default
2015/04/08 15:57:25:667 EDT [DEBUG] RequestAuthCache - Auth cache not set in the context
2015/04/08 15:57:25:668 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection request: [route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
2015/04/08 15:57:25:679 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection leased: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:681 EDT [DEBUG] MainClientExec - Opening connection /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:683 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connecting to /10.104.107.22:1354
2015/04/08 15:57:25:686 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connection established 127.0.0.1:46323<->10.104.107.22:1354
2015/04/08 15:57:25:686 EDT [DEBUG] MainClientExec - Executing request GET /video/Manifest HTTP/1.1
2015/04/08 15:57:25:686 EDT [DEBUG] MainClientExec - Target auth state: UNCHALLENGED
2015/04/08 15:57:25:687 EDT [DEBUG] MainClientExec - Proxy auth state: UNCHALLENGED
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> GET /video/Manifest HTTP/1.1
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> Connection: close
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> Host: 10.104.107.22:1354
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.4.1 (Java/1.7.0_55)
2015/04/08 15:57:25:688 EDT [DEBUG] headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << HTTP/1.1 302 Moved Temporarily
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << Content-Length: 0
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Location: http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Date: Wed, 08 Apr 2015 19:57:25 GMT
2015/04/08 15:57:25:707 EDT [DEBUG] MainClientExec - Connection can be kept alive indefinitely
2015/04/08 15:57:25:707 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354] can be kept alive indefinitely
2015/04/08 15:57:25:707 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection released: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:709 EDT [DEBUG] DefaultRedirectStrategy - Redirect requested to location 'http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850'
2015/04/08 15:57:25:713 EDT [DEBUG] RedirectExec - Redirecting to 'http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850' via /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:714 EDT [DEBUG] RequestAddCookies - CookieSpec selected: default
2015/04/08 15:57:25:714 EDT [DEBUG] RequestAuthCache - Auth cache not set in the context
2015/04/08 15:57:25:714 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection request: [route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:715 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection leased: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:715 EDT [DEBUG] MainClientExec - Executing request GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:715 EDT [DEBUG] MainClientExec - Target auth state: UNCHALLENGED
2015/04/08 15:57:25:716 EDT [DEBUG] MainClientExec - Proxy auth state: UNCHALLENGED
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> Connection: close
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> Host: 10.104.107.22:1354
2015/04/08 15:57:25:716 EDT [DEBUG] headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.4.1 (Java/1.7.0_55)
2015/04/08 15:57:25:717 EDT [DEBUG] headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
2015/04/08 15:57:25:717 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-0: Close connection
2015/04/08 15:57:25:718 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-0: Shutdown connection
2015/04/08 15:57:25:718 EDT [DEBUG] MainClientExec - Connection discarded
2015/04/08 15:57:25:718 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-0: Close connection
2015/04/08 15:57:25:718 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection released: [id: 0][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
2015/04/08 15:57:25:718 EDT [INFO] RetryExec - I/O exception (org.apache.http.NoHttpResponseException) caught when processing request to /127.0.0.1->{}->http://10.104.107.22:1354: The target server failed to respond
2015/04/08 15:57:25:718 EDT [DEBUG] RetryExec - The target server failed to respond <org.apache.http.NoHttpResponseException: The target server failed to respond>org.apache.http.NoHttpResponseException: The target server failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:143)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:261)
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:165)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:167)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:272)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:124)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:271)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
at WorkingNonKeepAliveUseCase.requestWithoutKeepAlive(WorkingNonKeepAliveUseCase.java:109)
at Runner.main(Runner.java:13)
2015/04/08 15:57:25:720 EDT [INFO] RetryExec - Retrying request to /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:720 EDT [DEBUG] RequestAddCookies - CookieSpec selected: default
2015/04/08 15:57:25:720 EDT [DEBUG] RequestAuthCache - Auth cache not set in the context
2015/04/08 15:57:25:720 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection request: [route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
2015/04/08 15:57:25:721 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection leased: [id: 1][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 0; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Opening connection /127.0.0.1->{}->http://10.104.107.22:1354
2015/04/08 15:57:25:721 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connecting to /10.104.107.22:1354
2015/04/08 15:57:25:721 EDT [DEBUG] DefaultHttpClientConnectionOperator - Connection established 127.0.0.1:40753<->10.104.107.22:1354
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Executing request GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Target auth state: UNCHALLENGED
2015/04/08 15:57:25:721 EDT [DEBUG] MainClientExec - Proxy auth state: UNCHALLENGED
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> GET /video/Manifest?sessionID=162729772390321694625639849465722594850 HTTP/1.1
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> Connection: close
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> Host: 10.104.107.22:1354
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> User-Agent: Apache-HttpClient/4.4.1 (Java/1.7.0_55)
2015/04/08 15:57:25:722 EDT [DEBUG] headers - http-outgoing-1 >> Accept-Encoding: gzip,deflate
2015/04/08 15:57:25:792 EDT [DEBUG] headers - http-outgoing-1 << HTTP/1.1 200 OK
2015/04/08 15:57:25:792 EDT [DEBUG] headers - http-outgoing-1 << Content-Length: 17090
2015/04/08 15:57:25:792 EDT [DEBUG] headers - http-outgoing-1 << Pragma: no-cache
2015/04/08 15:57:25:793 EDT [DEBUG] headers - http-outgoing-1 << Cache-Control: max-age=0, no-cache, no-store
2015/04/08 15:57:25:793 EDT [DEBUG] headers - http-outgoing-1 << Content-Type: application/vnd.ms-sstr+xml
2015/04/08 15:57:25:793 EDT [DEBUG] headers - http-outgoing-1 << Date: Wed, 08 Apr 2015 19:57:25 GMT
2015/04/08 15:57:25:794 EDT [DEBUG] MainClientExec - Connection can be kept alive indefinitely
2015/04/08 15:57:26:795 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection [id: 1][route: /127.0.0.1->{}->http://10.104.107.22:1354] can be kept alive indefinitely
2015/04/08 15:57:26:796 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection released: [id: 1][route: /127.0.0.1->{}->http://10.104.107.22:1354][total kept alive: 1; route allocated: 1 of 2; total allocated: 1 of 20]
2015/04/08 15:57:26:796 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection manager is shutting down
2015/04/08 15:57:26:796 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-1: Close connection
2015/04/08 15:57:26:797 EDT [DEBUG] DefaultManagedHttpClientConnection - http-outgoing-1: Close connection
2015/04/08 15:57:26:797 EDT [DEBUG] PoolingHttpClientConnectionManager - Connection manager shut down
问题出在这部分
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << HTTP/1.1 302 Moved Temporarily
2015/04/08 15:57:25:700 EDT [DEBUG] headers - http-outgoing-0 << Content-Length: 0
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Location: http://10.104.107.22:1354/video/Manifest?sessionID=162729772390321694625639849465722594850
2015/04/08 15:57:25:701 EDT [DEBUG] headers - http-outgoing-0 << Date: Wed, 08 Apr 2015 19:57:25 GMT
服务器发回的重定向响应没有任何服务器打算之后关闭连接的线索。 HttpClient 尽职地 returns 将连接返回到池中，并将其取回以处理导致 I/O 错误的重定向。
完全禁用连接持久性真的有充分的理由吗？我认为您最好让 HttpClient 为同一会话重新使用连接，然后在会话结束后立即从连接池中逐出所有持久连接。
来自 Oleg Kalnichevski 的后续评论。
HttpClient expects the opposite endpoint to explicitly state its intent and send 'Connection: close' if it intends to drop the connection.
这解决了我的问题。