$ GIT_CURL_VERBOSE=1 GIT_TRACE=1 git clone https://git.openstack.org/openstack/requirements
trace: built-in: git 'clone' 'https://git.openstack.org/openstack/requirements'
Initialized empty Git repository in /home/cloud-user/requirements/.git/
trace: run_command: 'git-remote-https' 'https://git.openstack.org/openstack/requirements' 'https://git.openstack.org/openstack/requirements'
* Couldn't find host git.openstack.org in the .netrc file; using defaults
* About to connect() to git.openstack.org port 443 (#0)
*   Trying 104.239.158.55... * Connected to git.openstack.org (104.239.158.55) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using TLS_DHE_RSA_WITH_AES_256_CBC_SHA
* Server certificate:
* 	subject: CN=git.openstack.org,OU=PositiveSSL,OU=Domain Control Validated
* 	start date: Jul 19 00:00:00 2013 GMT
* 	expire date: Jul 19 23:59:59 2015 GMT
* 	common name: git.openstack.org
* 	issuer: CN=PositiveSSL CA 2,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB
> GET /openstack/requirements/info/refs?service=git-upload-pack HTTP/1.1
User-Agent: git/1.7.1
Host: git.openstack.org
Accept: */*
Pragma: no-cache

< HTTP/1.1 200 OK
< Date: Fri, 26 Jun 2015 15:34:18 GMT
< Server: Apache/2.2.15 (CentOS)
< Expires: Fri, 01 Jan 1980 00:00:00 GMT
< Pragma: no-cache
< Cache-Control: no-cache, max-age=0, must-revalidate
< Connection: close
< Transfer-Encoding: chunked
< Content-Type: application/x-git-upload-pack-advertisement
<