Apache AsyncHttpClient 4.1.4创建新的套接字连接，而不是重用连接池中的连接

我们使用的Apache AsyncHttpClient具有以下依赖项

[INFO] +- org.apache.httpcomponents:httpasyncclient:jar:4.1.4:compile
[INFO] |  +- org.apache.httpcomponents:httpcore:jar:4.4.10:compile
[INFO] |  +- org.apache.httpcomponents:httpcore-nio:jar:4.4.10:compile
[INFO] |  - org.apache.httpcomponents:httpclient:jar:4.5.6:compile

我们注意到它正在为每个请求创建一个新的套接字连接，该连接具有下游(启用ssl和客户端身份验证(。我们的期望是重用来自池的连接。

以下是调试日志

2020:03:31:19:49:27.430 DEBUG I/O dispatcher 8 ManagedNHttpClientConnectionImpl  http-outgoing-55 127.0.0.1:51706<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:32.430 DEBUG I/O dispatcher 9 ManagedNHttpClientConnectionImpl  http-outgoing-56 127.0.0.1:51740<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:32.534 DEBUG I/O dispatcher 10 ManagedNHttpClientConnectionImpl  http-outgoing-57 127.0.0.1:51741<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:32.637 DEBUG I/O dispatcher 11 ManagedNHttpClientConnectionImpl  http-outgoing-58 127.0.0.1:51742<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:32.740 DEBUG I/O dispatcher 12 ManagedNHttpClientConnectionImpl  http-outgoing-59 127.0.0.1:51743<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:32.840 DEBUG I/O dispatcher 13 ManagedNHttpClientConnectionImpl  http-outgoing-60 127.0.0.1:51744<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:32.938 DEBUG I/O dispatcher 14 ManagedNHttpClientConnectionImpl  http-outgoing-61 127.0.0.1:51745<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.041 DEBUG I/O dispatcher 15 ManagedNHttpClientConnectionImpl  http-outgoing-62 127.0.0.1:51746<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.146 DEBUG I/O dispatcher 16 ManagedNHttpClientConnectionImpl  http-outgoing-63 127.0.0.1:51747<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.238 DEBUG I/O dispatcher 1 ManagedNHttpClientConnectionImpl  http-outgoing-64 127.0.0.1:51748<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.344 DEBUG I/O dispatcher 2 ManagedNHttpClientConnectionImpl  http-outgoing-65 127.0.0.1:51749<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.432 DEBUG I/O dispatcher 3 ManagedNHttpClientConnectionImpl  http-outgoing-66 127.0.0.1:51750<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.541 DEBUG I/O dispatcher 4 ManagedNHttpClientConnectionImpl  http-outgoing-67 127.0.0.1:51751<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.638 DEBUG I/O dispatcher 5 ManagedNHttpClientConnectionImpl  http-outgoing-68 127.0.0.1:51752<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500
2020:03:31:19:51:33.743 DEBUG I/O dispatcher 6 ManagedNHttpClientConnectionImpl  http-outgoing-69 127.0.0.1:51753<->127.0.0.1:8102[ACTIVE][rw:][ACTIVE][rw][NEED_UNWRAP][0][0][239]: Set timeout 500

注意：当在没有SSL的情况下使用时，它按照我们的预期工作(重用池中的连接(

以下是我们的配置

"sslEnabled": true,
"host": "127.0.0.1",
"port": 8102,
"staleConnectionMonitorThreadName": "http-stale-connection-cleaner-thread",
"publishMaxThreadPoolSize": 1,
"defaultMaxThreadsPerRoute": 1,
"maxThreadsPerRoute": 1,
"connectionRequestTimeoutMs": 500,
"connectionTimeoutMs": 500,
"socketTimeoutMs": 500,
"evictThreadSleepTimeMs" : 5000,
"maxKeepAliveTimeMs" : 30000,
"trustStorePath": "abc.jks",
"trustStoreKey": "**",
"keyStorePath": "xyx.jks",
"keyStoreKey": "**"

以下是请求头

Content-Type: application/json
v-c-correlation-id: f7e046a9-e1f1-44f1-9fb4-dddcb973a951
v-c-username: xyz
Content-Length: 218
Host: 127.0.0.1:8102
Connection: Keep-Alive
User-Agent: Apache-HttpAsyncClient/4.1.4 (Java/1.8.0_201)

以下是的响应标头

"HTTP/1.1 200 OK[r][n]"
"Content-Type: application/json[r][n]"
"v-c-correlation-id: f7e046a9-e1f1-44f1-9fb4-dddcb973a951[r][n]"
"Content-Length: 0[r][n]"

注：jdk版本为1.8

Apache HttpClient区分了所谓的无状态连接和有状态连接。有状态连接是指使用特定用户标识或安全上下文创建的连接。默认情况下，HttpClient版本4.x和5.x支持两种类型：具有NTLM身份验证的连接和具有客户端身份验证的TLS连接。完全可重复使用的状态连接被认为是敏感的。除非HTTP执行上下文中的用户令牌与池中保持活动的连接状态相匹配，否则连接池管理器不会租用这些连接。

One在同一执行上下文中执行多个请求，从而使它们共享相同的用户标识重要：HttpContext实例不得同时使用！存储在HttpContext中的某些属性不具有线程安全性！

CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
try {
httpclient.start();
HttpClientContext clientContext = HttpClientContext.create();
HttpGet request1 = new HttpGet("http://httpbin.org/get");
Future<HttpResponse> future1 = httpclient.execute(request1, clientContext, null);
HttpResponse response1 = future1.get();
System.out.println("Response: " + response1.getStatusLine());
HttpGet request2 = new HttpGet("http://httpbin.org/get");
Future<HttpResponse> future2 = httpclient.execute(request2, clientContext, null);
HttpResponse response2 = future2.get();
System.out.println("Response: " + response2.getStatusLine());
} finally {
System.out.println("Shutting down");
httpclient.close();
}

对相关请求使用不同的HttpContext实例，但手动为这些请求分配相同的用户令牌

CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
try {
httpclient.start();
HttpClientContext clientContext1 = HttpClientContext.create();
clientContext1.setUserToken("appuser");
HttpGet request1 = new HttpGet("http://httpbin.org/get");
Future<HttpResponse> future1 = httpclient.execute(request1, clientContext1, null);
HttpResponse response1 = future1.get();
System.out.println("Response: " + response1.getStatusLine());
HttpClientContext clientContext2 = HttpClientContext.create();
clientContext2.setUserToken("appuser");
HttpGet request2 = new HttpGet("http://httpbin.org/get");
Future<HttpResponse> future2 = httpclient.execute(request2, clientContext2, null);
HttpResponse response2 = future2.get();
System.out.println("Response: " + response2.getStatusLine());
} finally {
System.out.println("Shutting down");
httpclient.close();
}

如果客户端端点不支持不同的用户身份(所有HTTP请求都共享一个公共安全上下文(，则可以简单地禁用连接状态管理
```
CloseableHttpAsyncClient httpclient = HttpAsyncClients.custom()
.disableConnectionState()
.build();
```

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