Fan Fei

1. specify `ubuntu:14.04` and remove `ssl_crl` to make docker build work 2. use different serial number to generate `client.crt`. on CentOS 7, I have curl version detail ``` curl -V...

Sorry, the title is incorrect, I can updated the issue body, but can not update the title. the problem is: with the combination `field=filename type=string`, everything works fine. but the...