diff --git a/tempest/api/data_processing/base.py b/tempest/api/data_processing/base.py
index ab0e83a..cfb5a3d 100644
--- a/tempest/api/data_processing/base.py
+++ b/tempest/api/data_processing/base.py
@@ -75,16 +75,16 @@
         object. All resources created in this method will be automatically
         removed in tearDownClass method.
         """
-        resp, body = cls.client.create_node_group_template(name, plugin_name,
-                                                           hadoop_version,
-                                                           node_processes,
-                                                           flavor_id,
-                                                           node_configs,
-                                                           **kwargs)
+        _, resp_body = cls.client.create_node_group_template(name, plugin_name,
+                                                             hadoop_version,
+                                                             node_processes,
+                                                             flavor_id,
+                                                             node_configs,
+                                                             **kwargs)
         # store id of created node group template
-        cls._node_group_templates.append(body['id'])
+        cls._node_group_templates.append(resp_body['id'])
 
-        return resp, body
+        return resp_body
 
     @classmethod
     def create_cluster_template(cls, name, plugin_name, hadoop_version,
@@ -95,15 +95,15 @@
         object. All resources created in this method will be automatically
         removed in tearDownClass method.
         """
-        resp, body = cls.client.create_cluster_template(name, plugin_name,
-                                                        hadoop_version,
-                                                        node_groups,
-                                                        cluster_configs,
-                                                        **kwargs)
+        _, resp_body = cls.client.create_cluster_template(name, plugin_name,
+                                                          hadoop_version,
+                                                          node_groups,
+                                                          cluster_configs,
+                                                          **kwargs)
         # store id of created cluster template
-        cls._cluster_templates.append(body['id'])
+        cls._cluster_templates.append(resp_body['id'])
 
-        return resp, body
+        return resp_body
 
     @classmethod
     def create_data_source(cls, name, type, url, **kwargs):
@@ -113,11 +113,11 @@
         object. All resources created in this method will be automatically
         removed in tearDownClass method.
         """
-        resp, body = cls.client.create_data_source(name, type, url, **kwargs)
+        _, resp_body = cls.client.create_data_source(name, type, url, **kwargs)
         # store id of created data source
-        cls._data_sources.append(body['id'])
+        cls._data_sources.append(resp_body['id'])
 
-        return resp, body
+        return resp_body
 
     @classmethod
     def create_job_binary_internal(cls, name, data):
@@ -126,11 +126,11 @@
         It returns created object. All resources created in this method will
         be automatically removed in tearDownClass method.
         """
-        resp, body = cls.client.create_job_binary_internal(name, data)
+        _, resp_body = cls.client.create_job_binary_internal(name, data)
         # store id of created job binary internal
-        cls._job_binary_internals.append(body['id'])
+        cls._job_binary_internals.append(resp_body['id'])
 
-        return resp, body
+        return resp_body
 
     def create_job_binary(cls, name, url, extra=None, **kwargs):
         """Creates watched job binary with specified params.
@@ -139,8 +139,8 @@
         object. All resources created in this method will be automatically
         removed in tearDownClass method.
         """
-        resp, body = cls.client.create_job_binary(name, url, extra, **kwargs)
+        _, resp_body = cls.client.create_job_binary(name, url, extra, **kwargs)
         # store id of created job binary
-        cls._job_binaries.append(body['id'])
+        cls._job_binaries.append(resp_body['id'])
 
-        return resp, body
+        return resp_body
diff --git a/tempest/api/data_processing/test_cluster_templates.py b/tempest/api/data_processing/test_cluster_templates.py
index ad9ed2a..ff67c1c 100644
--- a/tempest/api/data_processing/test_cluster_templates.py
+++ b/tempest/api/data_processing/test_cluster_templates.py
@@ -39,7 +39,7 @@
                 }
             }
         }
-        resp_body = cls.create_node_group_template(**node_group_template)[1]
+        resp_body = cls.create_node_group_template(**node_group_template)
         node_group_template_id = resp_body['id']
 
         cls.full_cluster_template = {
@@ -95,23 +95,22 @@
     def _create_cluster_template(self, template_name=None):
         """Creates Cluster Template with optional name specified.
 
-        It creates template and ensures response status, template name and
-        response body. Returns id and name of created template.
+        It creates template, ensures template name and response body.
+        Returns id and name of created template.
         """
         if not template_name:
             # generate random name if it's not specified
             template_name = data_utils.rand_name('sahara-cluster-template')
 
         # create cluster template
-        resp, body = self.create_cluster_template(template_name,
-                                                  **self.full_cluster_template)
+        resp_body = self.create_cluster_template(template_name,
+                                                 **self.full_cluster_template)
 
         # ensure that template created successfully
-        self.assertEqual(202, resp.status)
-        self.assertEqual(template_name, body['name'])
-        self.assertDictContainsSubset(self.cluster_template, body)
+        self.assertEqual(template_name, resp_body['name'])
+        self.assertDictContainsSubset(self.cluster_template, resp_body)
 
-        return body['id'], template_name
+        return resp_body['id'], template_name
 
     @test.attr(type='smoke')
     def test_cluster_template_create(self):
@@ -122,8 +121,7 @@
         template_info = self._create_cluster_template()
 
         # check for cluster template in list
-        resp, templates = self.client.list_cluster_templates()
-        self.assertEqual(200, resp.status)
+        _, templates = self.client.list_cluster_templates()
         templates_info = [(template['id'], template['name'])
                           for template in templates]
         self.assertIn(template_info, templates_info)
@@ -133,16 +131,14 @@
         template_id, template_name = self._create_cluster_template()
 
         # check cluster template fetch by id
-        resp, template = self.client.get_cluster_template(template_id)
-        self.assertEqual(200, resp.status)
+        _, template = self.client.get_cluster_template(template_id)
         self.assertEqual(template_name, template['name'])
         self.assertDictContainsSubset(self.cluster_template, template)
 
     @test.attr(type='smoke')
     def test_cluster_template_delete(self):
-        template_id = self._create_cluster_template()[0]
+        template_id, _ = self._create_cluster_template()
 
         # delete the cluster template by id
-        resp = self.client.delete_cluster_template(template_id)[0]
-        self.assertEqual(204, resp.status)
+        self.client.delete_cluster_template(template_id)
         # TODO(ylobankov): check that cluster template is really deleted
diff --git a/tempest/api/data_processing/test_data_sources.py b/tempest/api/data_processing/test_data_sources.py
index 345153b..aae56c4 100644
--- a/tempest/api/data_processing/test_data_sources.py
+++ b/tempest/api/data_processing/test_data_sources.py
@@ -48,65 +48,59 @@
     def _create_data_source(self, source_body, source_name=None):
         """Creates Data Source with optional name specified.
 
-        It creates a link to input-source file (it may not exist) and ensures
-        response status and source name. Returns id and name of created source.
+        It creates a link to input-source file (it may not exist), ensures
+        source name and response body. Returns id and name of created source.
         """
         if not source_name:
             # generate random name if it's not specified
             source_name = data_utils.rand_name('sahara-data-source')
 
         # create data source
-        resp, body = self.create_data_source(source_name, **source_body)
+        resp_body = self.create_data_source(source_name, **source_body)
 
         # ensure that source created successfully
-        self.assertEqual(202, resp.status)
-        self.assertEqual(source_name, body['name'])
+        self.assertEqual(source_name, resp_body['name'])
         if source_body['type'] == 'swift':
             source_body = self.swift_data_source
-        self.assertDictContainsSubset(source_body, body)
+        self.assertDictContainsSubset(source_body, resp_body)
 
-        return body['id'], source_name
+        return resp_body['id'], source_name
 
     def _list_data_sources(self, source_info):
         # check for data source in list
-        resp, sources = self.client.list_data_sources()
-        self.assertEqual(200, resp.status)
+        _, sources = self.client.list_data_sources()
         sources_info = [(source['id'], source['name']) for source in sources]
         self.assertIn(source_info, sources_info)
 
     def _get_data_source(self, source_id, source_name, source_body):
         # check data source fetch by id
-        resp, source = self.client.get_data_source(source_id)
-        self.assertEqual(200, resp.status)
+        _, source = self.client.get_data_source(source_id)
         self.assertEqual(source_name, source['name'])
         self.assertDictContainsSubset(source_body, source)
 
-    def _delete_data_source(self, source_id):
-        # delete the data source by id
-        resp = self.client.delete_data_source(source_id)[0]
-        self.assertEqual(204, resp.status)
-
     @test.attr(type='smoke')
     def test_swift_data_source_create(self):
         self._create_data_source(self.swift_data_source_with_creds)
 
     @test.attr(type='smoke')
     def test_swift_data_source_list(self):
-        source_info = self._create_data_source(
-            self.swift_data_source_with_creds)
+        source_info = (
+            self._create_data_source(self.swift_data_source_with_creds))
         self._list_data_sources(source_info)
 
     @test.attr(type='smoke')
     def test_swift_data_source_get(self):
-        source_id, source_name = self._create_data_source(
-            self.swift_data_source_with_creds)
+        source_id, source_name = (
+            self._create_data_source(self.swift_data_source_with_creds))
         self._get_data_source(source_id, source_name, self.swift_data_source)
 
     @test.attr(type='smoke')
     def test_swift_data_source_delete(self):
-        source_id = self._create_data_source(
-            self.swift_data_source_with_creds)[0]
-        self._delete_data_source(source_id)
+        source_id, _ = (
+            self._create_data_source(self.swift_data_source_with_creds))
+
+        # delete the data source by id
+        self.client.delete_data_source(source_id)
 
     @test.attr(type='smoke')
     def test_local_hdfs_data_source_create(self):
@@ -119,15 +113,17 @@
 
     @test.attr(type='smoke')
     def test_local_hdfs_data_source_get(self):
-        source_id, source_name = self._create_data_source(
-            self.local_hdfs_data_source)
+        source_id, source_name = (
+            self._create_data_source(self.local_hdfs_data_source))
         self._get_data_source(
             source_id, source_name, self.local_hdfs_data_source)
 
     @test.attr(type='smoke')
     def test_local_hdfs_data_source_delete(self):
-        source_id = self._create_data_source(self.local_hdfs_data_source)[0]
-        self._delete_data_source(source_id)
+        source_id, _ = self._create_data_source(self.local_hdfs_data_source)
+
+        # delete the data source by id
+        self.client.delete_data_source(source_id)
 
     @test.attr(type='smoke')
     def test_external_hdfs_data_source_create(self):
@@ -140,12 +136,14 @@
 
     @test.attr(type='smoke')
     def test_external_hdfs_data_source_get(self):
-        source_id, source_name = self._create_data_source(
-            self.external_hdfs_data_source)
+        source_id, source_name = (
+            self._create_data_source(self.external_hdfs_data_source))
         self._get_data_source(
             source_id, source_name, self.external_hdfs_data_source)
 
     @test.attr(type='smoke')
     def test_external_hdfs_data_source_delete(self):
-        source_id = self._create_data_source(self.external_hdfs_data_source)[0]
-        self._delete_data_source(source_id)
+        source_id, _ = self._create_data_source(self.external_hdfs_data_source)
+
+        # delete the data source by id
+        self.client.delete_data_source(source_id)
diff --git a/tempest/api/data_processing/test_job_binaries.py b/tempest/api/data_processing/test_job_binaries.py
index 689c1fe..15ee145 100644
--- a/tempest/api/data_processing/test_job_binaries.py
+++ b/tempest/api/data_processing/test_job_binaries.py
@@ -40,8 +40,8 @@
 
         name = data_utils.rand_name('sahara-internal-job-binary')
         cls.job_binary_data = 'Some script may be data'
-        job_binary_internal = cls.create_job_binary_internal(
-            name, cls.job_binary_data)[1]
+        job_binary_internal = (
+            cls.create_job_binary_internal(name, cls.job_binary_data))
         cls.internal_db_job_binary = {
             'url': 'internal-db://%s' % job_binary_internal['id'],
             'description': 'Test job binary',
@@ -50,26 +50,25 @@
     def _create_job_binary(self, binary_body, binary_name=None):
         """Creates Job Binary with optional name specified.
 
-        It creates a link to data (jar, pig files, etc.) and ensures response
-        status, job binary name and response body. Returns id and name of
-        created job binary. Data may not exist when using Swift
-        as data storage. In other cases data must exist in storage.
+        It creates a link to data (jar, pig files, etc.), ensures job binary
+        name and response body. Returns id and name of created job binary.
+        Data may not exist when using Swift as data storage.
+        In other cases data must exist in storage.
         """
         if not binary_name:
             # generate random name if it's not specified
             binary_name = data_utils.rand_name('sahara-job-binary')
 
         # create job binary
-        resp, body = self.create_job_binary(binary_name, **binary_body)
+        resp_body = self.create_job_binary(binary_name, **binary_body)
 
         # ensure that binary created successfully
-        self.assertEqual(202, resp.status)
-        self.assertEqual(binary_name, body['name'])
+        self.assertEqual(binary_name, resp_body['name'])
         if 'swift' in binary_body['url']:
             binary_body = self.swift_job_binary
-        self.assertDictContainsSubset(binary_body, body)
+        self.assertDictContainsSubset(binary_body, resp_body)
 
-        return body['id'], binary_name
+        return resp_body['id'], binary_name
 
     @test.attr(type='smoke')
     def test_swift_job_binary_create(self):
@@ -80,30 +79,27 @@
         binary_info = self._create_job_binary(self.swift_job_binary_with_extra)
 
         # check for job binary in list
-        resp, binaries = self.client.list_job_binaries()
-        self.assertEqual(200, resp.status)
+        _, binaries = self.client.list_job_binaries()
         binaries_info = [(binary['id'], binary['name']) for binary in binaries]
         self.assertIn(binary_info, binaries_info)
 
     @test.attr(type='smoke')
     def test_swift_job_binary_get(self):
-        binary_id, binary_name = self._create_job_binary(
-            self.swift_job_binary_with_extra)
+        binary_id, binary_name = (
+            self._create_job_binary(self.swift_job_binary_with_extra))
 
         # check job binary fetch by id
-        resp, binary = self.client.get_job_binary(binary_id)
-        self.assertEqual(200, resp.status)
+        _, binary = self.client.get_job_binary(binary_id)
         self.assertEqual(binary_name, binary['name'])
         self.assertDictContainsSubset(self.swift_job_binary, binary)
 
     @test.attr(type='smoke')
     def test_swift_job_binary_delete(self):
-        binary_id = self._create_job_binary(
-            self.swift_job_binary_with_extra)[0]
+        binary_id, _ = (
+            self._create_job_binary(self.swift_job_binary_with_extra))
 
         # delete the job binary by id
-        resp = self.client.delete_job_binary(binary_id)[0]
-        self.assertEqual(204, resp.status)
+        self.client.delete_job_binary(binary_id)
 
     @test.attr(type='smoke')
     def test_internal_db_job_binary_create(self):
@@ -114,35 +110,31 @@
         binary_info = self._create_job_binary(self.internal_db_job_binary)
 
         # check for job binary in list
-        resp, binaries = self.client.list_job_binaries()
-        self.assertEqual(200, resp.status)
+        _, binaries = self.client.list_job_binaries()
         binaries_info = [(binary['id'], binary['name']) for binary in binaries]
         self.assertIn(binary_info, binaries_info)
 
     @test.attr(type='smoke')
     def test_internal_db_job_binary_get(self):
-        binary_id, binary_name = self._create_job_binary(
-            self.internal_db_job_binary)
+        binary_id, binary_name = (
+            self._create_job_binary(self.internal_db_job_binary))
 
         # check job binary fetch by id
-        resp, binary = self.client.get_job_binary(binary_id)
-        self.assertEqual(200, resp.status)
+        _, binary = self.client.get_job_binary(binary_id)
         self.assertEqual(binary_name, binary['name'])
         self.assertDictContainsSubset(self.internal_db_job_binary, binary)
 
     @test.attr(type='smoke')
     def test_internal_db_job_binary_delete(self):
-        binary_id = self._create_job_binary(self.internal_db_job_binary)[0]
+        binary_id, _ = self._create_job_binary(self.internal_db_job_binary)
 
         # delete the job binary by id
-        resp = self.client.delete_job_binary(binary_id)[0]
-        self.assertEqual(204, resp.status)
+        self.client.delete_job_binary(binary_id)
 
     @test.attr(type='smoke')
     def test_job_binary_get_data(self):
-        binary_id = self._create_job_binary(self.internal_db_job_binary)[0]
+        binary_id, _ = self._create_job_binary(self.internal_db_job_binary)
 
         # get data of job binary by id
-        resp, data = self.client.get_job_binary_data(binary_id)
-        self.assertEqual(200, resp.status)
+        _, data = self.client.get_job_binary_data(binary_id)
         self.assertEqual(data, self.job_binary_data)
diff --git a/tempest/api/data_processing/test_job_binary_internals.py b/tempest/api/data_processing/test_job_binary_internals.py
index 6d59177..45e1140 100644
--- a/tempest/api/data_processing/test_job_binary_internals.py
+++ b/tempest/api/data_processing/test_job_binary_internals.py
@@ -29,23 +29,22 @@
     def _create_job_binary_internal(self, binary_name=None):
         """Creates Job Binary Internal with optional name specified.
 
-        It puts data into Sahara database and ensures response status and
-        job binary internal name. Returns id and name of created job binary
-        internal.
+        It puts data into Sahara database and ensures job binary internal name.
+        Returns id and name of created job binary internal.
         """
         if not binary_name:
             # generate random name if it's not specified
             binary_name = data_utils.rand_name('sahara-job-binary-internal')
 
         # create job binary internal
-        resp, body = self.create_job_binary_internal(
-            binary_name, self.job_binary_internal_data)
+        resp_body = (
+            self.create_job_binary_internal(binary_name,
+                                            self.job_binary_internal_data))
 
         # ensure that job binary internal created successfully
-        self.assertEqual(202, resp.status)
-        self.assertEqual(binary_name, body['name'])
+        self.assertEqual(binary_name, resp_body['name'])
 
-        return body['id'], binary_name
+        return resp_body['id'], binary_name
 
     @test.attr(type='smoke')
     def test_job_binary_internal_create(self):
@@ -56,8 +55,7 @@
         binary_info = self._create_job_binary_internal()
 
         # check for job binary internal in list
-        resp, binaries = self.client.list_job_binary_internals()
-        self.assertEqual(200, resp.status)
+        _, binaries = self.client.list_job_binary_internals()
         binaries_info = [(binary['id'], binary['name']) for binary in binaries]
         self.assertIn(binary_info, binaries_info)
 
@@ -66,23 +64,20 @@
         binary_id, binary_name = self._create_job_binary_internal()
 
         # check job binary internal fetch by id
-        resp, binary = self.client.get_job_binary_internal(binary_id)
-        self.assertEqual(200, resp.status)
+        _, binary = self.client.get_job_binary_internal(binary_id)
         self.assertEqual(binary_name, binary['name'])
 
     @test.attr(type='smoke')
     def test_job_binary_internal_delete(self):
-        binary_id = self._create_job_binary_internal()[0]
+        binary_id, _ = self._create_job_binary_internal()
 
         # delete the job binary internal by id
-        resp = self.client.delete_job_binary_internal(binary_id)[0]
-        self.assertEqual(204, resp.status)
+        self.client.delete_job_binary_internal(binary_id)
 
     @test.attr(type='smoke')
     def test_job_binary_internal_get_data(self):
-        binary_id = self._create_job_binary_internal()[0]
+        binary_id, _ = self._create_job_binary_internal()
 
         # get data of job binary internal by id
-        resp, data = self.client.get_job_binary_internal_data(binary_id)
-        self.assertEqual(200, resp.status)
+        _, data = self.client.get_job_binary_internal_data(binary_id)
         self.assertEqual(data, self.job_binary_internal_data)
diff --git a/tempest/api/data_processing/test_node_group_templates.py b/tempest/api/data_processing/test_node_group_templates.py
index 04f98b4..c2c0075 100644
--- a/tempest/api/data_processing/test_node_group_templates.py
+++ b/tempest/api/data_processing/test_node_group_templates.py
@@ -43,7 +43,7 @@
     def _create_node_group_template(self, template_name=None):
         """Creates Node Group Template with optional name specified.
 
-        It creates template and ensures response status and template name.
+        It creates template, ensures template name and response body.
         Returns id and name of created template.
         """
         if not template_name:
@@ -51,15 +51,14 @@
             template_name = data_utils.rand_name('sahara-ng-template')
 
         # create node group template
-        resp, body = self.create_node_group_template(
-            template_name, **self.node_group_template)
+        resp_body = self.create_node_group_template(template_name,
+                                                    **self.node_group_template)
 
         # ensure that template created successfully
-        self.assertEqual(202, resp.status)
-        self.assertEqual(template_name, body['name'])
-        self.assertDictContainsSubset(self.node_group_template, body)
+        self.assertEqual(template_name, resp_body['name'])
+        self.assertDictContainsSubset(self.node_group_template, resp_body)
 
-        return body['id'], template_name
+        return resp_body['id'], template_name
 
     @test.attr(type='smoke')
     def test_node_group_template_create(self):
@@ -70,8 +69,7 @@
         template_info = self._create_node_group_template()
 
         # check for node group template in list
-        resp, templates = self.client.list_node_group_templates()
-        self.assertEqual(200, resp.status)
+        _, templates = self.client.list_node_group_templates()
         templates_info = [(template['id'], template['name'])
                           for template in templates]
         self.assertIn(template_info, templates_info)
@@ -81,15 +79,13 @@
         template_id, template_name = self._create_node_group_template()
 
         # check node group template fetch by id
-        resp, template = self.client.get_node_group_template(template_id)
-        self.assertEqual(200, resp.status)
+        _, template = self.client.get_node_group_template(template_id)
         self.assertEqual(template_name, template['name'])
         self.assertDictContainsSubset(self.node_group_template, template)
 
     @test.attr(type='smoke')
     def test_node_group_template_delete(self):
-        template_id = self._create_node_group_template()[0]
+        template_id, _ = self._create_node_group_template()
 
         # delete the node group template by id
-        resp = self.client.delete_node_group_template(template_id)[0]
-        self.assertEqual(204, resp.status)
+        self.client.delete_node_group_template(template_id)
diff --git a/tempest/api/data_processing/test_plugins.py b/tempest/api/data_processing/test_plugins.py
index d643f23..9fd7a17 100644
--- a/tempest/api/data_processing/test_plugins.py
+++ b/tempest/api/data_processing/test_plugins.py
@@ -20,10 +20,9 @@
     def _list_all_plugin_names(self):
         """Returns all enabled plugin names.
 
-        It ensures response status and main plugins availability.
+        It ensures main plugins availability.
         """
-        resp, plugins = self.client.list_plugins()
-        self.assertEqual(200, resp.status)
+        _, plugins = self.client.list_plugins()
         plugins_names = [plugin['name'] for plugin in plugins]
         self.assertIn('vanilla', plugins_names)
         self.assertIn('hdp', plugins_names)
@@ -37,14 +36,12 @@
     @test.attr(type='smoke')
     def test_plugin_get(self):
         for plugin_name in self._list_all_plugin_names():
-            resp, plugin = self.client.get_plugin(plugin_name)
-            self.assertEqual(200, resp.status)
+            _, plugin = self.client.get_plugin(plugin_name)
             self.assertEqual(plugin_name, plugin['name'])
 
             for plugin_version in plugin['versions']:
-                resp, detailed_plugin = self.client.get_plugin(plugin_name,
-                                                               plugin_version)
-                self.assertEqual(200, resp.status)
+                _, detailed_plugin = self.client.get_plugin(plugin_name,
+                                                            plugin_version)
                 self.assertEqual(plugin_name, detailed_plugin['name'])
 
                 # check that required image tags contains name and version
diff --git a/tempest/services/data_processing/v1_1/client.py b/tempest/services/data_processing/v1_1/client.py
index c2c7fd1..1fe0cf1 100644
--- a/tempest/services/data_processing/v1_1/client.py
+++ b/tempest/services/data_processing/v1_1/client.py
@@ -25,29 +25,42 @@
         super(DataProcessingClient, self).__init__(auth_provider)
         self.service = CONF.data_processing.catalog_type
 
-    @classmethod
-    def _request_and_parse(cls, req_fun, uri, res_name, *args, **kwargs):
-        """Make a request using specified req_fun and parse response.
+    def _request_and_check_resp(self, request_func, uri, resp_status):
+        """Make a request using specified request_func and check response
+        status code.
+
+        It returns pair: resp and response body.
+        """
+        resp, body = request_func(uri)
+        self.expected_success(resp_status, resp.status)
+        return resp, body
+
+    def _request_check_and_parse_resp(self, request_func, uri, resp_status,
+                                      resource_name, *args, **kwargs):
+        """Make a request using specified request_func, check response status
+        code and parse response body.
 
         It returns pair: resp and parsed resource(s) body.
         """
-        resp, body = req_fun(uri, headers={
-            'Content-Type': 'application/json'
-        }, *args, **kwargs)
+        headers = {'Content-Type': 'application/json'}
+        resp, body = request_func(uri, headers=headers, *args, **kwargs)
+        self.expected_success(resp_status, resp.status)
         body = json.loads(body)
-        return resp, body[res_name]
+        return resp, body[resource_name]
 
     def list_node_group_templates(self):
         """List all node group templates for a user."""
 
         uri = 'node-group-templates'
-        return self._request_and_parse(self.get, uri, 'node_group_templates')
+        return self._request_check_and_parse_resp(self.get, uri,
+                                                  200, 'node_group_templates')
 
     def get_node_group_template(self, tmpl_id):
         """Returns the details of a single node group template."""
 
         uri = 'node-group-templates/%s' % tmpl_id
-        return self._request_and_parse(self.get, uri, 'node_group_template')
+        return self._request_check_and_parse_resp(self.get, uri,
+                                                  200, 'node_group_template')
 
     def create_node_group_template(self, name, plugin_name, hadoop_version,
                                    node_processes, flavor_id,
@@ -67,20 +80,22 @@
             'flavor_id': flavor_id,
             'node_configs': node_configs or dict(),
         })
-        return self._request_and_parse(self.post, uri, 'node_group_template',
-                                       body=json.dumps(body))
+        return self._request_check_and_parse_resp(self.post, uri, 202,
+                                                  'node_group_template',
+                                                  body=json.dumps(body))
 
     def delete_node_group_template(self, tmpl_id):
         """Deletes the specified node group template by id."""
 
         uri = 'node-group-templates/%s' % tmpl_id
-        return self.delete(uri)
+        return self._request_and_check_resp(self.delete, uri, 204)
 
     def list_plugins(self):
         """List all enabled plugins."""
 
         uri = 'plugins'
-        return self._request_and_parse(self.get, uri, 'plugins')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'plugins')
 
     def get_plugin(self, plugin_name, plugin_version=None):
         """Returns the details of a single plugin."""
@@ -88,19 +103,21 @@
         uri = 'plugins/%s' % plugin_name
         if plugin_version:
             uri += '/%s' % plugin_version
-        return self._request_and_parse(self.get, uri, 'plugin')
+        return self._request_check_and_parse_resp(self.get, uri, 200, 'plugin')
 
     def list_cluster_templates(self):
         """List all cluster templates for a user."""
 
         uri = 'cluster-templates'
-        return self._request_and_parse(self.get, uri, 'cluster_templates')
+        return self._request_check_and_parse_resp(self.get, uri,
+                                                  200, 'cluster_templates')
 
     def get_cluster_template(self, tmpl_id):
         """Returns the details of a single cluster template."""
 
         uri = 'cluster-templates/%s' % tmpl_id
-        return self._request_and_parse(self.get, uri, 'cluster_template')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'cluster_template')
 
     def create_cluster_template(self, name, plugin_name, hadoop_version,
                                 node_groups, cluster_configs=None,
@@ -119,26 +136,29 @@
             'node_groups': node_groups,
             'cluster_configs': cluster_configs or dict(),
         })
-        return self._request_and_parse(self.post, uri, 'cluster_template',
-                                       body=json.dumps(body))
+        return self._request_check_and_parse_resp(self.post, uri, 202,
+                                                  'cluster_template',
+                                                  body=json.dumps(body))
 
     def delete_cluster_template(self, tmpl_id):
         """Deletes the specified cluster template by id."""
 
         uri = 'cluster-templates/%s' % tmpl_id
-        return self.delete(uri)
+        return self._request_and_check_resp(self.delete, uri, 204)
 
     def list_data_sources(self):
         """List all data sources for a user."""
 
         uri = 'data-sources'
-        return self._request_and_parse(self.get, uri, 'data_sources')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'data_sources')
 
     def get_data_source(self, source_id):
         """Returns the details of a single data source."""
 
         uri = 'data-sources/%s' % source_id
-        return self._request_and_parse(self.get, uri, 'data_source')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'data_source')
 
     def create_data_source(self, name, data_source_type, url, **kwargs):
         """Creates data source with specified params.
@@ -153,57 +173,62 @@
             'type': data_source_type,
             'url': url
         })
-        return self._request_and_parse(self.post, uri, 'data_source',
-                                       body=json.dumps(body))
+        return self._request_check_and_parse_resp(self.post, uri,
+                                                  202, 'data_source',
+                                                  body=json.dumps(body))
 
     def delete_data_source(self, source_id):
         """Deletes the specified data source by id."""
 
         uri = 'data-sources/%s' % source_id
-        return self.delete(uri)
+        return self._request_and_check_resp(self.delete, uri, 204)
 
     def list_job_binary_internals(self):
         """List all job binary internals for a user."""
 
         uri = 'job-binary-internals'
-        return self._request_and_parse(self.get, uri, 'binaries')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'binaries')
 
     def get_job_binary_internal(self, job_binary_id):
         """Returns the details of a single job binary internal."""
 
         uri = 'job-binary-internals/%s' % job_binary_id
-        return self._request_and_parse(self.get, uri, 'job_binary_internal')
+        return self._request_check_and_parse_resp(self.get, uri,
+                                                  200, 'job_binary_internal')
 
     def create_job_binary_internal(self, name, data):
         """Creates job binary internal with specified params."""
 
         uri = 'job-binary-internals/%s' % name
-        return self._request_and_parse(self.put, uri, 'job_binary_internal',
-                                       data)
+        return self._request_check_and_parse_resp(self.put, uri, 202,
+                                                  'job_binary_internal', data)
 
     def delete_job_binary_internal(self, job_binary_id):
         """Deletes the specified job binary internal by id."""
 
         uri = 'job-binary-internals/%s' % job_binary_id
-        return self.delete(uri)
+        return self._request_and_check_resp(self.delete, uri, 204)
 
     def get_job_binary_internal_data(self, job_binary_id):
         """Returns data of a single job binary internal."""
 
         uri = 'job-binary-internals/%s/data' % job_binary_id
-        return self.get(uri)
+        return self._request_and_check_resp(self.get, uri, 200)
 
     def list_job_binaries(self):
         """List all job binaries for a user."""
 
         uri = 'job-binaries'
-        return self._request_and_parse(self.get, uri, 'binaries')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'binaries')
 
     def get_job_binary(self, job_binary_id):
         """Returns the details of a single job binary."""
 
         uri = 'job-binaries/%s' % job_binary_id
-        return self._request_and_parse(self.get, uri, 'job_binary')
+        return self._request_check_and_parse_resp(self.get,
+                                                  uri, 200, 'job_binary')
 
     def create_job_binary(self, name, url, extra=None, **kwargs):
         """Creates job binary with specified params.
@@ -218,17 +243,18 @@
             'url': url,
             'extra': extra or dict(),
         })
-        return self._request_and_parse(self.post, uri, 'job_binary',
-                                       body=json.dumps(body))
+        return self._request_check_and_parse_resp(self.post, uri,
+                                                  202, 'job_binary',
+                                                  body=json.dumps(body))
 
     def delete_job_binary(self, job_binary_id):
         """Deletes the specified job binary by id."""
 
         uri = 'job-binaries/%s' % job_binary_id
-        return self.delete(uri)
+        return self._request_and_check_resp(self.delete, uri, 204)
 
     def get_job_binary_data(self, job_binary_id):
         """Returns data of a single job binary."""
 
         uri = 'job-binaries/%s/data' % job_binary_id
-        return self.get(uri)
+        return self._request_and_check_resp(self.get, uri, 200)