java - Apache 服务器上的第一个 REST 调用速度缓慢

Question

我在某些请求中遇到了这个问题。用户的所有首次调用(或经过一段时间后)最多需要 60 秒才能完成。之后需要几毫秒。无论我是在 Internet 浏览器上还是使用 SOAP UI 调用它，它总是一样的。我正在 Apache 上运行 java 应用程序。我用 fiddler 运行它来查看调用花费最多时间的地方，看起来是在服务器收到请求和开始应答之间，每次都需要 61 秒。 Fiddler 还显示了两种情况下 SSL 握手都花费了几毫秒

我不知道还能去哪里寻找。如果有人能提供一些线索，我们将不胜感激。

第一个请求(需要 1 分 01 分钟)

Request Count:   1
Bytes Sent:      683        (headers:683; body:0)
Bytes Received:  846        (headers:347; body:499)

ACTUAL PERFORMANCE
--------------

This traffic was captured on Friday, May 18, 2018.

ClientConnected:    16:21:17.244
ClientBeginRequest: 16:21:17.465
GotRequestHeaders:  16:21:17.465
ClientDoneRequest:  16:21:17.465
Determine Gateway:  0ms
DNS Lookup:         0ms
TCP/IP Connect: 0ms
HTTPS Handshake:    0ms
ServerConnected:    16:21:17.275
FiddlerBeginRequest:    16:21:17.466
ServerGotRequest:   16:21:17.466
ServerBeginResponse:    16:22:18.597
GotResponseHeaders: 16:22:18.597
ServerDoneResponse: 16:22:18.599
ClientBeginResponse:    16:22:18.599
ClientDoneResponse: 16:22:18.599

    Overall Elapsed:    0:01:01.133

RESPONSE BYTES (by Content-Type)
--------------
application/json: 499
       ~headers~: 347

后续请求(需要 0.120 分钟)

Request Count:   1
Bytes Sent:      683        (headers:683; body:0)
Bytes Received:  846        (headers:347; body:499)

ACTUAL PERFORMANCE
--------------

This traffic was captured on Friday, May 18, 2018.

ClientConnected:    16:22:38.582
ClientBeginRequest: 16:22:38.607
GotRequestHeaders:  16:22:38.607
ClientDoneRequest:  16:22:38.607
Determine Gateway:  0ms
DNS Lookup:         0ms
TCP/IP Connect: 0ms
HTTPS Handshake:    0ms
ServerConnected:    16:22:38.589
FiddlerBeginRequest:    16:22:38.607
ServerGotRequest:   16:22:38.607
ServerBeginResponse:    16:22:38.726
GotResponseHeaders: 16:22:38.726
ServerDoneResponse: 16:22:38.727
ClientBeginResponse:    16:22:38.727
ClientDoneResponse: 16:22:38.727

    Overall Elapsed:    0:00:00.120

RESPONSE BYTES (by Content-Type)
--------------
application/json: 499
       ~headers~: 347

这就是使用浏览器进行的另一个首次调用的样子 Chrome Network Analysis

谢谢!!

Answer 1

所以，我终于发表了这篇关于 LDAP 的文章 -> Debugging a timeout with ldap auth on apache

这恰好是我的情况。将 LDAPConnectionPoolTTL 0 添加到我的 httpd.config 解决了我的问题。