Glance can not create image if we specified image_url

ISO: {"build_id": "2014-10-21_22-46-19", "ostf_sha": "de177931b53fbe9655502b73d03910b8118e25f1", "build_number": "156", "auth_required": true, "api": "1.0", "nailgun_sha": "f4bf25da24c4e5b0d9eb86493945200deba3d92e", "production": "docker", "fuelmain_sha": "dab17913263bbea7e9a3b55de8a0f3af5ac0e3e2", "astute_sha": "6a11a7c481d116e6cfdb422fab1d4bbb29cbea1c", "feature_groups": ["mirantis"], "release": "6.0", "release_versions": {"2014.2-6.0": {"VERSION": {"build_id": "2014-10-21_22-46-19", "ostf_sha": "de177931b53fbe9655502b73d03910b8118e25f1", "build_number": "156", "api": "1.0", "nailgun_sha": "f4bf25da24c4e5b0d9eb86493945200deba3d92e", "production": "docker", "fuelmain_sha": "dab17913263bbea7e9a3b55de8a0f3af5ac0e3e2", "astute_sha": "6a11a7c481d116e6cfdb422fab1d4bbb29cbea1c", "feature_groups": ["mirantis"], "release": "6.0", "fuellib_sha": "af2bf11d4a3a075fa4e9fa9b7b7209af29498a46"}}}, "fuellib_sha": "af2bf11d4a3a075fa4e9fa9b7b7209af29498a46"}

Steps to reproduce:
1. Install OS(HA, with default store for glance)
2. Upload image by using image_url

Actual result:
We get the following error:
<h1>400 Bad Request</h1>
03:16:59.534 External sourcing not supported for store

Need to add glance.store.http.Store in known_stores option in glance-cache config, and it would be work