[squid-users] 503 issue after accessing https svn

[G~D~Lunatic]

my squid is a transparent proxy. and the problem is that i can't access the svn server.
the access.log shows that 
1512545348.844    380 192.168.51.15 TAG_NONE/200 0 CONNECT 192.168.52.6:443 - ORIGINAL_DST/192.168.52.6 -
1512545348.920      0 192.168.51.15 TAG_NONE/503 4324 OPTIONS https://192.168.52.6/svn/WATMdev/trunk/development/third_period/icapServer - HIER_NONE/- text/html

but when i use splice step . the access is normal.  so i want to know  what's the problem.  


Here is my configure

https_port 192.168.51.200:3129 intercept ssl-bump connection-auth=off generate-host-certificates=on dynamic_cert_mem_cache_size=4MB cert=/usr/local/squid/ssl_cert/myCA.pem key=/usr/local/squid/ssl_cert/myCA.pem options=NO_SSLv3,NO_SSLv2


acl broken_sites ssl::server_name matchweb.sports.qq.com
acl ssl_step1 at_step SslBump1
acl ssl_step2 at_step SslBump2
acl ssl_step3 at_step SslBump3
ssl_bump splice broken_sites
#ssl_bump splice all
ssl_bump stare ssl_step1
ssl_bump bump ssl_step2
ssl_bump terminate ssl_step3
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