版本：Apache / 2.4.10（Raspbian）PHP / 5.6.30-0 + deb8u1 OpenSSL / 1.0.1t
从linux控制台，testingssl超时：
time openssl s_client -connect xyz:443 ... Start Time: 1504204638 Timeout : 300 (sec) Verify return code: 0 (ok) --- (delay of about 20 secs) ---- read:errno=0 real 0m20.903s user 0m0.050s sys 0m0.000s 当上述testing完成时，错误日志显示（在debugging级别设置中）
[2017-08-31 12:00:46] [ssl:info] [client 192.168.1.1:38094] AH01964: Connection to child 0 established (server xyz:443) [2017-08-31 12:00:46] [ssl:debug] ssl_engine_kernel.c(1936): [client 192.168.1.1:38094] AH02645: Server name not provided via TLS extension (using default/first virtual host) [2017-08-31 12:00:46] [ssl:debug] ssl_engine_kernel.c(1841): [client 192.168.1.1:38094] AH02041: Protocol: TLSv1.2, Cipher: ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
（注意21秒延迟（显然openssl有20秒的硬编码延迟））
[2017-08-31 12:01:07] [reqtimeout:info] [client 192.168.1.1:38094] AH01382: Request header read timeout [2017-08-31 12:01:07] [ssl:info] (70007)The timeout specified has expired: [client 192.168.1.1:38094] AH01991: SSL input filter read failed. [2017-08-31 12:01:07] [ssl:debug] ssl_engine_io.c(1004): [client 192.168.1.1:38094] AH02001: Connection closed to child 0 with standard shutdown (server xyz:443)
图像上传，甚至是小文件，大约15秒后超时，独立于以下（见两个设置尝试）
# the following is an expt, setting very low to see if this statement has any effect at all. We get time out after 15 secs, for any setting. #RequestReadTimeout header=5 body=9 RequestReadTimeout header=60-100,MinRate=50 body=80,MinRate=50
对于超时期间在apache 2.4 error.log中的实际超时（With上述任一设置，超时几乎是相同的15秒;下面只显示一个日志）
[2017-08-31 12:06:52] [authz_core:debug] mod_authz_core.c(809): [client 192.168.1.1:52406] AH01626: authorization result of <RequireAny>: granted, referer ...
（注意授权，延迟15秒以上！）
[2017-08-31 12:07:07] [reqtimeout:info] [client 192.168.1.1:52406] AH01382: Request header read timeout [2017-08-31 12:07:07] [ssl:info] (70007)The timeout specified has expired: [client 192.168.1.1:52406] AH01991: SSL input filter read failed. [2017-08-31 12:07:07] [ssl:debug] ssl_engine_io.c(1004): [client 192.168.1.1:52406] AH02001: Connection closed to child 2 with standardshutdown (server xyz:443)