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Description of problem:
operation hang when convert image on http server, cpu and mem usage is 0

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.9.0-3.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.#qemu-img convert -f qcow2 -O raw 'json:{"file.driver":"http", "file.url":"http://10.66.10.53/test/rhel73-64-virtio.qcow2", "file.sslverify":"off", "file.readahead":"64k"}' convert.img

2.
3.

Actual results:


Expected results:


Additional info:

#top -p `pidof qemu-img`
  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                           
11469 root      20   0  590052  18304   6508 S   0.0  0.2   0:00.08 qemu-img

# qemu-img convert -p http://10.66.10.53/test/rhel73-64-virtio.qcow2 test
    (0.00/100%)

I think the problem is using http. IIRC we only support https in RHEL, but it needs proper investigation and proper error handling.

See also Bug 1449879 and Bug 1447413

*** This bug has been marked as a duplicate of bug 1437393 ***