Using version salt 0.17.1 I'm having trouble getting a file from an http source here

/var/lib/jenkins/plugins/active-directory.hpi:
  file.managed:
    - source: http://repo.jenkins-ci.org/releases/org/jenkins-ci/plugins/active-directory/1.31/active-directory-1.31.hpi
    - source_hash: md5=http://repo.jenkins-ci.org/releases/org/jenkins-ci/plugins/active-directory/1.31/active-directory-1.31.hpi.md5
    - user: jenkins
    - group: jenkins

The error I get is:

   State: - file
    Name:      /var/lib/jenkins/plugins/active-directory.hpi
    Function:  managed
        Result:    False
        Comment:   File sum set for file /var/lib/jenkins/plugins/active-directory.hpi of http://repo.jenkins-ci.org/releases/org/jenkins-ci/plugins/active-directory/1.31/active-directory-1.\
31.hpi.md5 does not match real sum of 45feb723d08d45efd6f9a3ae0efb6a06
        Changes:   diff: New file

if I enter the md5 hash for  the source_hash directly like so
    - source_hash: md5=45feb723d08d45efd6f9a3ae0efb6a06
and it works.  Any ideas why this doesn't work?