Kateryna,
For op_host you put
```
"op_host":"https://gluu_server_2.4.4"
```
But it seems you don't have Gluu Server installed for this address. Please provide valid Gluu Server url.
You should be able to check it also manually if hit in browser this discovery url:
```
https://gluu_server_2.4.4/.well-known/openid-configuration
```
Then in browser you should see somethink like this:
```
{
"issuer":
"https://gluu_server_2.4.4.com",
"authorization_endpoint":
"https://gluu_server_2.4.4.com/connect/authorize",
"token_endpoint":
"https://gluu_server_2.4.4/connect/token",
"token_endpoint_auth_methods_supported":
["client_secret_basic", "private_key_jwt"],
"token_endpoint_auth_signing_alg_values_supported":
["RS256", "ES256"],
"userinfo_endpoint":
"https://gluu_server_2.4.4.com/connect/userinfo",
"check_session_iframe":
"https://gluu_server_2.4.4.com/connect/check_session",
"end_session_endpoint":
"https://gluu_server_2.4.4.com/connect/end_session",
"jwks_uri":
"https://gluu_server_2.4.4.com/jwks.json",
"registration_endpoint":
"https://gluu_server_2.4.4.com/connect/register",
"scopes_supported":
["openid", "profile", "email", "address",
"phone", "offline_access"],
"response_types_supported":
["code", "code id_token", "id_token", "token id_token"],
"acr_values_supported":
["urn:mace:incommon:iap:silver",
"urn:mace:incommon:iap:bronze"],
"subject_types_supported":
["public", "pairwise"],
"userinfo_signing_alg_values_supported":
["RS256", "ES256", "HS256"],
"userinfo_encryption_alg_values_supported":
["RSA1_5", "A128KW"],
"userinfo_encryption_enc_values_supported":
["A128CBC-HS256", "A128GCM"],
"id_token_signing_alg_values_supported":
["RS256", "ES256", "HS256"],
"id_token_encryption_alg_values_supported":
["RSA1_5", "A128KW"],
...
}
```