diff --git a/certServiceClient/pom.xml b/certServiceClient/pom.xml
index 5392163..9e82883 100644
--- a/certServiceClient/pom.xml
+++ b/certServiceClient/pom.xml
@@ -173,6 +173,14 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-log4j2</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpclient</artifactId>
+        </dependency>
     </dependencies>
 
 </project>
\ No newline at end of file
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/CertServiceClient.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/CertServiceClient.java
index 3e8f73e..59d0c03 100644
--- a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/CertServiceClient.java
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/CertServiceClient.java
@@ -28,12 +28,16 @@
 import org.onap.aaf.certservice.client.configuration.factory.CsrConfigurationFactory;
 import org.onap.aaf.certservice.client.configuration.model.ClientConfiguration;
 import org.onap.aaf.certservice.client.configuration.model.CsrConfiguration;
+import org.onap.aaf.certservice.client.httpclient.CloseableHttpClientProvider;
+import org.onap.aaf.certservice.client.httpclient.HttpClient;
+import org.onap.aaf.certservice.client.httpclient.model.CertServiceResponse;
 
 import java.security.KeyPair;
 
 import static org.onap.aaf.certservice.client.api.ExitCode.SUCCESS_EXIT_CODE;
 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.KEY_SIZE;
 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.RSA_ENCRYPTION_ALGORITHM;
+import static org.onap.aaf.certservice.client.common.Base64Coder.encode;
 
 public class CertServiceClient {
     private AppExitHandler appExitHandler;
@@ -49,7 +53,16 @@
             CsrConfiguration csrConfiguration = new CsrConfigurationFactory(new EnvsForCsr()).create();
             KeyPair keyPair = keyPairFactory.create();
             CsrFactory csrFactory = new CsrFactory(csrConfiguration);
-            String csr = csrFactory.createEncodedCsr(keyPair);
+
+            CloseableHttpClientProvider provider = new CloseableHttpClientProvider(clientConfiguration.getRequestTimeout());
+            HttpClient httpClient = new HttpClient(provider, clientConfiguration.getUrlToCertService());
+
+            CertServiceResponse certServiceData =
+                    httpClient.retrieveCertServiceData(
+                            clientConfiguration.getCaName(),
+                            csrFactory.createEncodedCsr(keyPair),
+                            encode(keyPair.getPrivate().toString()));
+
         } catch (ExitableException e) {
             appExitHandler.exit(e.applicationExitCode());
         }
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitCode.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitCode.java
index 45f2c40..b72a0e2 100644
--- a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitCode.java
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitCode.java
@@ -23,7 +23,9 @@
     CLIENT_CONFIGURATION_EXCEPTION(1),
     CSR_CONFIGURATION_EXCEPTION(2),
     KEY_PAIR_GENERATION_EXCEPTION(3),
-    CSR_GENERATION_EXCEPTION(4);
+    CSR_GENERATION_EXCEPTION(4),
+    CERT_SERVICE_API_CONNECTION_EXCEPTION(5),
+    HTTP_CLIENT_EXCEPTION(6);
 
     private final int value;
 
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitableException.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitableException.java
index 51981a4..f9166c9 100644
--- a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitableException.java
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/api/ExitableException.java
@@ -26,6 +26,5 @@
     public ExitableException(String message) {
         super(message);
     }
-
     public abstract int applicationExitCode();
 }
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/common/Base64Coder.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/common/Base64Coder.java
new file mode 100644
index 0000000..c066187
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/common/Base64Coder.java
@@ -0,0 +1,29 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.common;
+
+import org.bouncycastle.util.encoders.Base64;
+
+public class Base64Coder {
+    public static String encode(String string){
+        return new String(Base64.encode(string.getBytes()));
+    }
+}
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/CloseableHttpClientProvider.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/CloseableHttpClientProvider.java
new file mode 100644
index 0000000..ff29a14
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/CloseableHttpClientProvider.java
@@ -0,0 +1,40 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient;
+
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+
+public class CloseableHttpClientProvider {
+
+    private final int timeout;
+
+    public CloseableHttpClientProvider(int timeout) {
+        this.timeout = timeout;
+    }
+
+    public CloseableHttpClient getClient() {
+        RequestConfig config =
+                RequestConfig.custom().setConnectionRequestTimeout(timeout).build();
+        return HttpClientBuilder.create().setDefaultRequestConfig(config).build();
+    }
+}
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/HttpClient.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/HttpClient.java
new file mode 100644
index 0000000..603d584
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/HttpClient.java
@@ -0,0 +1,109 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient;
+
+import com.google.gson.Gson;
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.util.EntityUtils;
+import org.onap.aaf.certservice.client.httpclient.exception.CertServiceApiResponseException;
+import org.onap.aaf.certservice.client.httpclient.exception.HttpClientException;
+import org.onap.aaf.certservice.client.httpclient.model.CertServiceResponse;
+import org.onap.aaf.certservice.client.httpclient.model.ErrorCertServiceResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+public class HttpClient {
+
+    private static final String CSR_HEADER_NAME = "CSR";
+    private static final String PK_HEADER_NAME = "PK";
+    private static final String CHARSET_UTF_8 = "UTF-8";
+
+    private final Logger LOGGER = LoggerFactory.getLogger(HttpClient.class);
+
+    private final Gson gson = new Gson();
+    private final CloseableHttpClientProvider httpClientProvider;
+    private final String certServiceAddress;
+
+    public HttpClient(CloseableHttpClientProvider httpClientProvider, String certServiceAddress) {
+        this.httpClientProvider = httpClientProvider;
+        this.certServiceAddress = certServiceAddress;
+    }
+
+    public CertServiceResponse retrieveCertServiceData(String caName, String csr, String encodedPk)
+            throws CertServiceApiResponseException, HttpClientException {
+
+        try (CloseableHttpClient httpClient = httpClientProvider.getClient()) {
+            HttpResponse httpResponse = httpClient.execute(createHttpPayload(caName, csr, encodedPk));
+            return extractCertServiceResponse(httpResponse);
+
+        } catch (IOException e) {
+            LOGGER.error(String.format("Failed on communication between client and API for URL: '%s' . Exception message: '%s'",
+                    certServiceAddress + caName, e.getMessage()));
+            throw new HttpClientException(e);
+        }
+    }
+
+    private int getStatusCode(HttpResponse httpResponse) {
+        return httpResponse.getStatusLine().getStatusCode();
+    }
+
+    private CertServiceResponse extractCertServiceResponse(HttpResponse httpResponse)
+            throws CertServiceApiResponseException, IOException {
+        int httpResponseCode = getStatusCode(httpResponse);
+        if (HttpStatus.SC_OK != httpResponseCode) {
+            LOGGER.error(String.format("Error on API response. Response Code: %d", httpResponseCode));
+            throw generateApiResponseException(httpResponse);
+        }
+        String jsonResponse = getStringResponse(httpResponse.getEntity());
+        return gson.fromJson(jsonResponse, CertServiceResponse.class);
+    }
+
+    private String getStringResponse(HttpEntity httpEntity) throws IOException {
+        return EntityUtils.toString(httpEntity, CHARSET_UTF_8);
+    }
+
+    private HttpGet createHttpPayload(String caName, String csr, String pk) {
+        String url = certServiceAddress + caName;
+        HttpGet httpGet = new HttpGet(url);
+        httpGet.addHeader(CSR_HEADER_NAME, csr);
+        httpGet.addHeader(PK_HEADER_NAME, pk);
+        return httpGet;
+    }
+
+
+    private CertServiceApiResponseException generateApiResponseException(HttpResponse httpResponse) throws IOException {
+        String stringResponse = getStringResponse(httpResponse.getEntity());
+        ErrorCertServiceResponse errorCertServiceResponse =
+                gson.fromJson(stringResponse, ErrorCertServiceResponse.class);
+
+        String messageFromApi = errorCertServiceResponse.getMessage();
+        String path = errorCertServiceResponse.getPath();
+        int httpResponseCode = getStatusCode(httpResponse);
+
+        return new CertServiceApiResponseException(certServiceAddress + path, httpResponseCode, messageFromApi);
+    }
+}
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/exception/CertServiceApiResponseException.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/exception/CertServiceApiResponseException.java
new file mode 100644
index 0000000..40470af
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/exception/CertServiceApiResponseException.java
@@ -0,0 +1,42 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient.exception;
+
+import org.onap.aaf.certservice.client.api.ExitCode;
+import org.onap.aaf.certservice.client.api.ExitableException;
+
+public class CertServiceApiResponseException extends ExitableException {
+    private final ExitCode EXIT_CODE = ExitCode.CERT_SERVICE_API_CONNECTION_EXCEPTION;
+
+    public CertServiceApiResponseException(String url, int responseCode, String messageFromAPI) {
+
+        super(String.format("Request failed for URL '%s'. Response code: %d . Message from API: %s",
+                url,
+                responseCode,
+                messageFromAPI));
+    }
+
+    @Override
+    public int applicationExitCode() {
+        return EXIT_CODE.getValue();
+    }
+
+}
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/exception/HttpClientException.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/exception/HttpClientException.java
new file mode 100644
index 0000000..d6fb146
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/exception/HttpClientException.java
@@ -0,0 +1,37 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient.exception;
+
+import org.onap.aaf.certservice.client.api.ExitCode;
+import org.onap.aaf.certservice.client.api.ExitableException;
+
+public class HttpClientException extends ExitableException {
+    private final ExitCode EXIT_CODE = ExitCode.HTTP_CLIENT_EXCEPTION;
+
+    public HttpClientException(Throwable e) {
+        super(e);
+    }
+
+    @Override
+    public int applicationExitCode() {
+        return EXIT_CODE.getValue();
+    }
+}
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/model/CertServiceResponse.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/model/CertServiceResponse.java
new file mode 100644
index 0000000..4ca1799
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/model/CertServiceResponse.java
@@ -0,0 +1,44 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient.model;
+
+import java.util.Collections;
+import java.util.List;
+
+public class CertServiceResponse {
+
+    private final List<String> certificateChain;
+    private final List<String> trustedCertificates;
+
+    public CertServiceResponse(List<String> certificateChain, List<String> trustedCertificates) {
+        this.certificateChain = certificateChain;
+        this.trustedCertificates = trustedCertificates;
+    }
+
+    public List<String> getCertificateChain() {
+        return Collections.unmodifiableList(certificateChain);
+    }
+
+    public List<String> getTrustedCertificates() {
+        return Collections.unmodifiableList(trustedCertificates);
+    }
+
+}
diff --git a/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/model/ErrorCertServiceResponse.java b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/model/ErrorCertServiceResponse.java
new file mode 100644
index 0000000..6fe99ce
--- /dev/null
+++ b/certServiceClient/src/main/java/org/onap/aaf/certservice/client/httpclient/model/ErrorCertServiceResponse.java
@@ -0,0 +1,40 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient.model;
+
+public class ErrorCertServiceResponse {
+
+    private final String message;
+    private final String path;
+
+    public ErrorCertServiceResponse(String message, String path) {
+        this.message = message;
+        this.path = path;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public String getPath() {
+        return path;
+    }
+}
diff --git a/certServiceClient/src/test/java/org/onap/aaf/certservice/client/CerServiceRequestTestData.java b/certServiceClient/src/test/java/org/onap/aaf/certservice/client/CerServiceRequestTestData.java
new file mode 100644
index 0000000..8f252c3
--- /dev/null
+++ b/certServiceClient/src/test/java/org/onap/aaf/certservice/client/CerServiceRequestTestData.java
@@ -0,0 +1,89 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+public final class CerServiceRequestTestData {
+
+    private static final String RESOURCE_PATH = "src/test/resources/";
+
+    // Request parameters
+    public static final String CA_NAME = "TestCA";
+    public static final String CSR = getCsrValue();
+    public static final String PK = getPkValue();
+
+    // Correct response data
+    public static final String CORRECT_RESPONSE = getCorrectResponse();
+    public static final String EXPECTED_FIRST_ELEMENT_OF_CERTIFICATE_CHAIN =
+            getExpectedFirstElementOfCertificateChain();
+    public static final String EXPECTED_FIRST_ELEMENT_OF_TRUSTED_CERTIFICATES =
+            getExpectedFirstElementOfTrustedCertificates();
+
+    // Error response data
+    public static final String MISSING_PK_RESPONSE = getMissingPkResponse();
+
+    private CerServiceRequestTestData() {
+    }
+
+    private static String getMissingPkResponse() {
+        String fileName = "missingPkResponse";
+        return readFromFile(RESOURCE_PATH + fileName);
+    }
+
+    private static String getExpectedFirstElementOfTrustedCertificates() {
+
+        String fileName = "expectedFirstElementOfTrustedCertificates";
+        return readFromFile(RESOURCE_PATH + fileName);
+    }
+
+    private static String getExpectedFirstElementOfCertificateChain() {
+        String fileName = "expectedFirstElementOfCertificateChain";
+        return readFromFile(RESOURCE_PATH + fileName);
+    }
+
+    private static String getCorrectResponse() {
+        String fileName = "correctResponse";
+        return readFromFile(RESOURCE_PATH + fileName);
+    }
+
+    private static String getPkValue() {
+        String fileName = "testPk";
+        return readFromFile(RESOURCE_PATH + fileName);
+    }
+
+    private static String getCsrValue() {
+        String fileName = "testCsr";
+        return readFromFile(RESOURCE_PATH + fileName);
+    }
+
+    private static String readFromFile(String path) {
+        try {
+            return Files.readString(Paths.get(path), StandardCharsets.UTF_8);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return "File not found";
+        }
+    }
+}
diff --git a/certServiceClient/src/test/java/org/onap/aaf/certservice/client/httpclient/HttpClientTest.java b/certServiceClient/src/test/java/org/onap/aaf/certservice/client/httpclient/HttpClientTest.java
new file mode 100644
index 0000000..f65aefd
--- /dev/null
+++ b/certServiceClient/src/test/java/org/onap/aaf/certservice/client/httpclient/HttpClientTest.java
@@ -0,0 +1,125 @@
+/*
+ * ============LICENSE_START=======================================================
+ * aaf-certservice-client
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aaf.certservice.client.httpclient;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.StatusLine;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.onap.aaf.certservice.client.api.ExitCode;
+import org.onap.aaf.certservice.client.httpclient.exception.CertServiceApiResponseException;
+import org.onap.aaf.certservice.client.httpclient.model.CertServiceResponse;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.util.List;
+
+import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;
+import static java.net.HttpURLConnection.HTTP_OK;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.CA_NAME;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.CORRECT_RESPONSE;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.CSR;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.EXPECTED_FIRST_ELEMENT_OF_CERTIFICATE_CHAIN;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.EXPECTED_FIRST_ELEMENT_OF_TRUSTED_CERTIFICATES;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.MISSING_PK_RESPONSE;
+import static org.onap.aaf.certservice.client.CerServiceRequestTestData.PK;
+
+class HttpClientTest {
+
+    private HttpClient httpClient;
+    private CloseableHttpClient closeableHttpClient;
+    private HttpEntity httpEntity;
+    private StatusLine statusLine;
+    private CloseableHttpResponse httpResponse;
+
+    @BeforeEach
+    void setUp() {
+
+        closeableHttpClient = mock(CloseableHttpClient.class);
+        httpEntity = mock(HttpEntity.class);
+        statusLine = mock(StatusLine.class);
+        httpResponse = mock(CloseableHttpResponse.class);
+
+        CloseableHttpClientProvider httpClientProvider = mock(CloseableHttpClientProvider.class);
+
+        when(httpClientProvider.getClient()).thenReturn(closeableHttpClient);
+        String testCertServiceAddress = "";
+        httpClient = new HttpClient(httpClientProvider, testCertServiceAddress);
+    }
+
+    @Test
+    void shouldReturnCorrectListsOfCertificatedChainsAndTrustedCertificates_WhenRequestDataIsCorrect()
+            throws Exception {
+
+        // given
+        mockServerResponse(HTTP_OK, CORRECT_RESPONSE);
+
+        // when
+        CertServiceResponse certServiceResponse =
+                httpClient.retrieveCertServiceData(CA_NAME, CSR, PK);
+        List<String> certificateChain = certServiceResponse.getCertificateChain();
+        List<String> trustedCertificate = certServiceResponse.getTrustedCertificates();
+
+        // then
+        assertNotNull(certServiceResponse);
+
+        final int expectedTwoElements = 2;
+        assertEquals(expectedTwoElements, certificateChain.size());
+        assertEquals(expectedTwoElements, trustedCertificate.size());
+
+        assertEquals(EXPECTED_FIRST_ELEMENT_OF_CERTIFICATE_CHAIN, certificateChain.get(0));
+        assertEquals(EXPECTED_FIRST_ELEMENT_OF_TRUSTED_CERTIFICATES, trustedCertificate.get(0));
+    }
+
+    @Test
+    void shouldThrowCertServiceApiResponseException_WhenPkHeaderIsMissing() throws Exception {
+
+        // given
+        mockServerResponse(HTTP_BAD_REQUEST, MISSING_PK_RESPONSE);
+
+        // when
+        CertServiceApiResponseException exception =
+                assertThrows(CertServiceApiResponseException.class,
+                        () -> httpClient.retrieveCertServiceData(CA_NAME, CSR, ""));
+
+        // then
+        assertEquals(ExitCode.CERT_SERVICE_API_CONNECTION_EXCEPTION.getValue(), exception.applicationExitCode());
+    }
+
+    private void mockServerResponse(int serverCodeResponse, String stringResponse)
+            throws IOException {
+        when(statusLine.getStatusCode()).thenReturn(serverCodeResponse);
+        when(httpResponse.getStatusLine()).thenReturn(statusLine);
+        when(httpResponse.getEntity()).thenReturn(httpEntity);
+        when(closeableHttpClient.execute(any(HttpGet.class))).thenReturn(httpResponse);
+
+        when(httpEntity.getContent()).thenReturn(new ByteArrayInputStream(stringResponse.getBytes()));
+    }
+}
diff --git a/certServiceClient/src/test/resources/correctResponse b/certServiceClient/src/test/resources/correctResponse
new file mode 100644
index 0000000..c7bf349
--- /dev/null
+++ b/certServiceClient/src/test/resources/correctResponse
@@ -0,0 +1,10 @@
+{
+    "certificateChain": [
+        "-----BEGIN CERTIFICATE-----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\n-----END CERTIFICATE-----",
+        "-----BEGIN CERTIFICATE-----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\nXGN5NWV//4bP+NFmwgcn7AYCdRvz04A8GU/0Cwg=\n-----END CERTIFICATE-----"
+    ],
+    "trustedCertificates": [
+        "-----BEGIN CERTIFICATE-----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\nm/wB+2VPIYcsPMtIhHC4tgoSaiCqjXYptaOh4b8ye8CPBUCpX/AYYkN0Ow==\n-----END CERTIFICATE-----",
+        "-----BEGIN CERTIFICATE-----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\n0rTO\n-----END CERTIFICATE-----"
+    ]
+}
\ No newline at end of file
diff --git a/certServiceClient/src/test/resources/expectedFirstElementOfCertificateChain b/certServiceClient/src/test/resources/expectedFirstElementOfCertificateChain
new file mode 100644
index 0000000..1cbbc8d
--- /dev/null
+++ b/certServiceClient/src/test/resources/expectedFirstElementOfCertificateChain
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/certServiceClient/src/test/resources/expectedFirstElementOfTrustedCertificates b/certServiceClient/src/test/resources/expectedFirstElementOfTrustedCertificates
new file mode 100644
index 0000000..2d36a22
--- /dev/null
+++ b/certServiceClient/src/test/resources/expectedFirstElementOfTrustedCertificates
@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/certServiceClient/src/test/resources/missingPkResponse b/certServiceClient/src/test/resources/missingPkResponse
new file mode 100644
index 0000000..c53358e
--- /dev/null
+++ b/certServiceClient/src/test/resources/missingPkResponse
@@ -0,0 +1,7 @@
+{
+    "timestamp": "2020-02-25T06:36:23.651+0000",
+    "status": 400,
+    "error": "Bad Request",
+    "message": "Missing request header 'PK' for method parameter of type String",
+    "path": "//v1/certificate/TestCA"
+}
\ No newline at end of file
diff --git a/certServiceClient/src/test/resources/testCsr b/certServiceClient/src/test/resources/testCsr
new file mode 100644
index 0000000..aa9387b
--- /dev/null
+++ b/certServiceClient/src/test/resources/testCsr
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/certServiceClient/src/test/resources/testPk b/certServiceClient/src/test/resources/testPk
new file mode 100644
index 0000000..36bc983
--- /dev/null
+++ b/certServiceClient/src/test/resources/testPk
@@ -0,0 +1 @@
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\ No newline at end of file