我正在使用Apache HttpClient 4.5.1向我们的服务器发送一些请求。为了提高性能，我想为所有这些请求重用相同的HttpClient实例。请求（大多数）按顺序发生，因此不涉及多线程。
不幸的是，某些服务器端点出现故障。他们正在返回HTTP 204（无内容），但无论如何都会在响应正文中返回一些数据。即使在最新版本中已经修复了这个问题，我们也必须在很长一段时间内处理旧版本。此服务器行为导致HTTP客户端在下一个请求上“挂起”（/ timeout）（有关详细信息，请参阅Every second request using Apache HTTPClient fails）。
有没有办法在客户端解决这个问题？我试过这个
HttpEntity entity = response.getEntity();
if (null != entity) {
EntityUtils.consumeQuietly(entity);
}
但实体似乎是null，所以我不能消耗连接套接字中的响应数据。是否有另一种方法来清除套接字而不丢弃HttpClient实例（及其HTTP连接）？
客户端日志如下所示：
DefaultManagedHttpClientConnection - http-outgoing-0: set socket timeout to 90000
MainClientExec - Executing request DELETE /prod/update-rest/private/deleteGroup/AS123 HTTP/1.1
MainClientExec - Target auth state: UNCHALLENGED
MainClientExec - Proxy auth state: UNCHALLENGED
headers - http-outgoing-0 >> DELETE /prod/update-rest/private/deleteGroup/AS123 HTTP/1.1
headers - http-outgoing-0 >> Host: xyz
headers - http-outgoing-0 >> Connection: Keep-Alive
headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.5.1 (Java/1.7.0_79)
headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
wire - http-outgoing-0 >> "DELETE /prod/update-rest/private/deleteGroup/AS123 HTTP/1.1[\r][\n]"
wire - http-outgoing-0 >> "Host: xyz[\r][\n]"
wire - http-outgoing-0 >> "Connection: Keep-Alive[\r][\n]"
wire - http-outgoing-0 >> "User-Agent: Apache-HttpClient/4.5.1 (Java/1.7.0_79)[\r][\n]"
wire - http-outgoing-0 >> "Accept-Encoding: gzip,deflate[\r][\n]"
wire - http-outgoing-0 >> "[\r][\n]"
wire - http-outgoing-0 << "HTTP/1.1 401 Unauthorized[\r][\n]"
wire - http-outgoing-0 << "Date: Mon, 05 Oct 2015 13:30:35 GMT[\r][\n]"
wire - http-outgoing-0 << "Server: Apache/2.2.12 (Linux/SUSE)[\r][\n]"
wire - http-outgoing-0 << "Pragma: No-cache[\r][\n]"
wire - http-outgoing-0 << "Cache-Control: no-cache[\r][\n]"
wire - http-outgoing-0 << "Expires: Thu, 01 Jan 1970 01:00:00 CET[\r][\n]"
wire - http-outgoing-0 << "WWW-Authenticate: Basic realm="ApplicationRealm"[\r][\n]"
wire - http-outgoing-0 << "Content-Length: 958[\r][\n]"
wire - http-outgoing-0 << "Keep-Alive: timeout=15, max=100[\r][\n]"
wire - http-outgoing-0 << "Connection: Keep-Alive[\r][\n]"
wire - http-outgoing-0 << "Content-Type: text/html;charset=utf-8[\r][\n]"
wire - http-outgoing-0 << "[\r][\n]"
headers - http-outgoing-0 << HTTP/1.1 401 Unauthorized
headers - http-outgoing-0 << Date: Mon, 05 Oct 2015 13:30:35 GMT
headers - http-outgoing-0 << Server: Apache/2.2.12 (Linux/SUSE)
headers - http-outgoing-0 << Pragma: No-cache
headers - http-outgoing-0 << Cache-Control: no-cache
headers - http-outgoing-0 << Expires: Thu, 01 Jan 1970 01:00:00 CET
headers - http-outgoing-0 << WWW-Authenticate: Basic realm="ApplicationRealm"
headers - http-outgoing-0 << Content-Length: 958
headers - http-outgoing-0 << Keep-Alive: timeout=15, max=100
headers - http-outgoing-0 << Connection: Keep-Alive
headers - http-outgoing-0 << Content-Type: text/html;charset=utf-8
MainClientExec - Connection can be kept alive for 15000 MILLISECONDS
HttpAuthenticator - Authentication required
HttpAuthenticator - xyz:443 requested authentication
TargetAuthenticationStrategy - Authentication schemes in the order of preference: [Negotiate, Kerberos, NTLM, Digest, Basic]
TargetAuthenticationStrategy - Challenge for Negotiate authentication scheme not available
TargetAuthenticationStrategy - Challenge for Kerberos authentication scheme not available
TargetAuthenticationStrategy - Challenge for NTLM authentication scheme not available
TargetAuthenticationStrategy - Challenge for Digest authentication scheme not available
HttpAuthenticator - Selected authentication options: [BASIC [complete=true]]
wire - http-outgoing-0 << "<html><head><title>JBoss Web/7.0.13.Final - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 401 - </h1><HR size="1" noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>This request requires HTTP authentication ().</u></p><HR size="1" noshade="noshade"><h3>JBoss Web/7.0.13.Final</h3></body></html>"
DefaultManagedHttpClientConnection - http-outgoing-0: set socket timeout to 90000
MainClientExec - Executing request DELETE /prod/update-rest/private/deleteGroup/AS123 HTTP/1.1
MainClientExec - Target auth state: CHALLENGED
HttpAuthenticator - Generating response to an authentication challenge using basic scheme
MainClientExec - Proxy auth state: UNCHALLENGED
headers - http-outgoing-0 >> DELETE /prod/update-rest/private/deleteGroup/AS123 HTTP/1.1
headers - http-outgoing-0 >> Host: xyz
headers - http-outgoing-0 >> Connection: Keep-Alive
headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.5.1 (Java/1.7.0_79)
headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
headers - http-outgoing-0 >> Authorization: Basic dGN1YWRtaW46c3RhcnQ=
wire - http-outgoing-0 >> "DELETE /prod/update-rest/private/deleteGroup/AS123 HTTP/1.1[\r][\n]"
wire - http-outgoing-0 >> "Host: xyz[\r][\n]"
wire - http-outgoing-0 >> "Connection: Keep-Alive[\r][\n]"
wire - http-outgoing-0 >> "User-Agent: Apache-HttpClient/4.5.1 (Java/1.7.0_79)[\r][\n]"
wire - http-outgoing-0 >> "Accept-Encoding: gzip,deflate[\r][\n]"
wire - http-outgoing-0 >> "Authorization: Basic dGN1YWRtaW46c3RhcnQ=[\r][\n]"
wire - http-outgoing-0 >> "[\r][\n]"
wire - http-outgoing-0 << "HTTP/1.1 204 No Content[\r][\n]"
wire - http-outgoing-0 << "Date: Mon, 05 Oct 2015 13:30:35 GMT[\r][\n]"
wire - http-outgoing-0 << "Server: Apache/2.2.12 (Linux/SUSE)[\r][\n]"
wire - http-outgoing-0 << "Pragma: No-cache[\r][\n]"
wire - http-outgoing-0 << "Cache-Control: no-cache[\r][\n]"
wire - http-outgoing-0 << "Expires: Thu, 01 Jan 1970 01:00:00 CET[\r][\n]"
wire - http-outgoing-0 << "Content-Length: 22[\r][\n]"
wire - http-outgoing-0 << "Keep-Alive: timeout=15, max=99[\r][\n]"
wire - http-outgoing-0 << "Connection: Keep-Alive[\r][\n]"
wire - http-outgoing-0 << "Content-Type: */*[\r][\n]"
wire - http-outgoing-0 << "[\r][\n]"
headers - http-outgoing-0 << HTTP/1.1 204 No Content
headers - http-outgoing-0 << Date: Mon, 05 Oct 2015 13:30:35 GMT
headers - http-outgoing-0 << Server: Apache/2.2.12 (Linux/SUSE)
headers - http-outgoing-0 << Pragma: No-cache
headers - http-outgoing-0 << Cache-Control: no-cache
headers - http-outgoing-0 << Expires: Thu, 01 Jan 1970 01:00:00 CET
headers - http-outgoing-0 << Content-Length: 22
headers - http-outgoing-0 << Keep-Alive: timeout=15, max=99
headers - http-outgoing-0 << Connection: Keep-Alive
headers - http-outgoing-0 << Content-Type: */*
MainClientExec - Connection can be kept alive for 15000 MILLISECONDS
HttpAuthenticator - Authentication succeeded
TargetAuthenticationStrategy - Caching 'basic' auth scheme for https://xyz:443
PoolingHttpClientConnectionManager - Connection [id: 0][route: {s}->https://xyz:443] can be kept alive for 15.0 seconds
PoolingHttpClientConnectionManager - Connection released: [id: 0][route: {s}->https://xyz:443][total kept alive: 1; route allocated: 1 of 20; total allocated: 1 of 20]
RequestAddCookies - CookieSpec selected: default
RequestAuthCache - Auth cache not set in the context
PoolingHttpClientConnectionManager - Connection request: [route: {s}->https://xyz:443][total kept alive: 1; route allocated: 1 of 20; total allocated: 1 of 20]
PoolingHttpClientConnectionManager - Connection leased: [id: 0][route: {s}->https://xyz:443][total kept alive: 0; route allocated: 1 of 20; total allocated: 1 of 20]
DefaultManagedHttpClientConnection - http-outgoing-0: set socket timeout to 90000
MainClientExec - Executing request DELETE /prod/update-rest/private/deleteGroup/AS678 HTTP/1.1
MainClientExec - Target auth state: UNCHALLENGED
MainClientExec - Proxy auth state: UNCHALLENGED
headers - http-outgoing-0 >> DELETE /prod/update-rest/private/deleteGroup/AS678 HTTP/1.1
headers - http-outgoing-0 >> Host: xyz
headers - http-outgoing-0 >> Connection: Keep-Alive
headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.5.1 (Java/1.7.0_79)
headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
wire - http-outgoing-0 >> "DELETE /prod/update-rest/private/deleteGroup/AS678 HTTP/1.1[\r][\n]"
wire - http-outgoing-0 >> "Host: xyz[\r][\n]"
wire - http-outgoing-0 >> "Connection: Keep-Alive[\r][\n]"
wire - http-outgoing-0 >> "User-Agent: Apache-HttpClient/4.5.1 (Java/1.7.0_79)[\r][\n]"
wire - http-outgoing-0 >> "Accept-Encoding: gzip,deflate[\r][\n]"
wire - http-outgoing-0 >> "[\r][\n]"
wire - http-outgoing-0 << "Group AS123 not found!"
wire - http-outgoing-0 << "HTTP/1.1 401 Unauthorized[\r][\n]"
wire - http-outgoing-0 << "Date: Mon, 05 Oct 2015 13:30:36 GMT[\r][\n]"
wire - http-outgoing-0 << "Server: Apache/2.2.12 (Linux/SUSE)[\r][\n]"
wire - http-outgoing-0 << "Pragma: No-cache[\r][\n]"
wire - http-outgoing-0 << "Cache-Control: no-cache[\r][\n]"
wire - http-outgoing-0 << "Expires: Thu, 01 Jan 1970 01:00:00 CET[\r][\n]"
wire - http-outgoing-0 << "WWW-Authenticate: Basic realm="ApplicationRealm"[\r][\n]"
wire - http-outgoing-0 << "Content-Length: 958[\r][\n]"
wire - http-outgoing-0 << "Keep-Alive: timeout=15, max=98[\r][\n]"
wire - http-outgoing-0 << "Connection: Keep-Alive[\r][\n]"
wire - http-outgoing-0 << "Content-Type: text/html;charset=utf-8[\r][\n]"
wire - http-outgoing-0 << "[\r][\n]"
DefaultHttpResponseParser - Garbage in response: Group AS123 not found!HTTP/1.1 401 Unauthorized
DefaultHttpResponseParser - Garbage in response: Date: Mon, 05 Oct 2015 13:30:36 GMT
DefaultHttpResponseParser - Garbage in response: Server: Apache/2.2.12 (Linux/SUSE)
DefaultHttpResponseParser - Garbage in response: Pragma: No-cache
答案 0 :(得分：1)
我设法解决了我的问题：
我创建了一个 HttpRequestExecutor 的子类，覆盖 canResponseHaveBody 方法，如下所示：
protected boolean canResponseHaveBody(final HttpRequest request,
final HttpResponse response) {
if ("HEAD".equalsIgnoreCase(request.getRequestLine().getMethod())) {
return false;
}
final int status = response.getStatusLine().getStatusCode();
return status >= HttpStatus.SC_OK
// && status != HttpStatus.SC_NO_CONTENT
&& status != HttpStatus.SC_NOT_MODIFIED
&& status != HttpStatus.SC_RESET_CONTENT;
}
使用 HttpClients.custom（）。setRequestExecutor（）注册后，我能够通过 response.getEntity（）来回收垃圾并使用它。
之后，下一个请求就像魅力一样。