Run policy GUIs in a single JAR

Create gui-server module serving clamp and apex GUIs using Spring
Add Spring filter to pass client SSL cert to clamp backend
Remove nginx from docker image
Add logback.xml to docker image
Add helper scripts for running gui-server jar and docker

Issue-ID: POLICY-3638
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: Ie857f5755015c522b8cf781de255f7a1d567e263

17 files changed, 1055 insertions, 0 deletions

diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/SpringContextTest.java b/gui-server/src/test/java/org/onap/policy/gui/server/SpringContextTest.java
new file mode 100644
index 0000000..7be7694
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/SpringContextTest.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest(
+    properties = {
+        "clamp.url=https://clamp-backend:8443/",
+        "clamp.disable-ssl-validation=true"
+    })
+class SpringContextTest {
+
+    @Test
+    @SuppressWarnings("java:S2699")
+    void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig1Test.java b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig1Test.java
new file mode 100644
index 0000000..44e4c46
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig1Test.java
@@ -0,0 +1,69 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.config;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import javax.net.ssl.SSLPeerUnverifiedException;
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.hello.HelloWorldApplication;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.web.client.RestClientException;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * In this test, SSL validation and hostname check are enabled.
+ * Since our keystore cert has a hostname 'helloworld' and our test request is
+ * to localhost, the request will fail with an SSLPeerUnverifiedException, as
+ * the SSL cert name does not match the server name 'localhost'.
+ */
+@SpringBootTest(
+    classes = { HelloWorldApplication.class, ClampRestTemplateConfig.class },
+    properties = {
+        "server.ssl.key-store=file:src/test/resources/helloworld-keystore.jks",
+        "server.ssl.key-store-password=changeit",
+        "server.ssl.trust-store=file:src/test/resources/helloworld-truststore.jks",
+        "server.ssl.trust-store-password=changeit",
+        "clamp.disable-ssl-validation=false",
+        "clamp.disable-ssl-hostname-check=false"
+    },
+    webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class ClampRestTemplateConfig1Test {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    @Qualifier("clampRestTemplate")
+    private RestTemplate restTemplate;
+
+    @Test
+    void testRequestFailsWhenSslHostnameCheckIsEnabled() {
+        var helloUrl = "https://localhost:" + port + "/";
+        Exception e = assertThrows(RestClientException.class,
+            () -> restTemplate.getForEntity(helloUrl, String.class));
+        assertTrue(e.getCause() instanceof SSLPeerUnverifiedException);
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig2Test.java b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig2Test.java
new file mode 100644
index 0000000..b8e744c
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig2Test.java
@@ -0,0 +1,61 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.config;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.onap.policy.gui.server.test.util.hello.HelloWorldRestController.HELLO_WORLD_STRING;
+
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.hello.HelloWorldApplication;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * In this test, SSL validation is disabled.
+ * The test request should succeed. A trust store has not been supplied in this case.
+ */
+@SpringBootTest(
+    classes = { HelloWorldApplication.class, ClampRestTemplateConfig.class },
+    properties = {
+        "server.ssl.key-store=file:src/test/resources/helloworld-keystore.jks",
+        "server.ssl.key-store-password=changeit",
+        "clamp.disable-ssl-validation=true"
+    },
+    webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class ClampRestTemplateConfig2Test {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    @Qualifier("clampRestTemplate")
+    private RestTemplate restTemplate;
+
+    @Test
+    void testRequestSucceedsWhenSslValidationIsDisabled() {
+        var helloUrl = "https://localhost:" + port + "/";
+        String response = restTemplate.getForObject(helloUrl, String.class);
+        assertEquals(HELLO_WORLD_STRING, response);
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig3Test.java b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig3Test.java
new file mode 100644
index 0000000..4636982
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig3Test.java
@@ -0,0 +1,70 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.config;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.onap.policy.gui.server.test.util.hello.HelloWorldRestController.HELLO_WORLD_STRING;
+
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.hello.HelloWorldApplication;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * In this test, SSL validation is enabled but hostname check is disabled.
+ * Even though our keystore cert has a hostname 'helloworld' and our test
+ * request is to localhost, the request will succeed as the SSL hostname check
+ * is disabled.
+ */
+@SpringBootTest(
+    classes = { HelloWorldApplication.class, ClampRestTemplateConfig.class },
+    properties = {
+        "server.ssl.key-store=file:src/test/resources/helloworld-keystore.jks",
+        "server.ssl.key-store-password=changeit",
+        "server.ssl.trust-store=file:src/test/resources/helloworld-truststore.jks",
+        "server.ssl.trust-store-password=changeit",
+        "clamp.disable-ssl-validation=false",
+        "clamp.disable-ssl-hostname-check=true"
+    },
+    webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class ClampRestTemplateConfig3Test {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    @Qualifier("clampRestTemplate")
+    private RestTemplate restTemplate;
+
+    /*
+     * In this test, the request will succeed even though the SSL cert name
+     * does not match 'localhost', as SSL hostname verification is disabled.
+     */
+    @Test
+    void testRequestSucceedsWhenSslHostnameCheckIsDisabled() {
+        var helloUrl = "https://localhost:" + port + "/";
+        String response = restTemplate.getForObject(helloUrl, String.class);
+        assertEquals(HELLO_WORLD_STRING, response);
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig4Test.java b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig4Test.java
new file mode 100644
index 0000000..f0f222f
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig4Test.java
@@ -0,0 +1,67 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.config;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.onap.policy.gui.server.test.util.hello.HelloWorldRestController.HELLO_WORLD_STRING;
+
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.hello.HelloWorldApplication;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * In this test, SSL validation is disabled but hostname check is explicitly
+ * enabled. The expected behaviour is to disable the hostname check if SSL
+ * validation is disabled. We expect the request to succeed even though the
+ * SSL cert name does not match 'localhost', as SSL hostname verification is
+ * implicitly disabled.
+ */
+@SpringBootTest(
+    classes = { HelloWorldApplication.class, ClampRestTemplateConfig.class },
+    properties = {
+        "server.ssl.key-store=file:src/test/resources/helloworld-keystore.jks",
+        "server.ssl.key-store-password=changeit",
+        "server.ssl.trust-store=file:src/test/resources/helloworld-truststore.jks",
+        "server.ssl.trust-store-password=changeit",
+        "clamp.disable-ssl-validation=true",
+        "clamp.disable-ssl-hostname-check=false"
+    },
+    webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class ClampRestTemplateConfig4Test {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    @Qualifier("clampRestTemplate")
+    private RestTemplate restTemplate;
+
+    @Test
+    void testHostnameCheckIsDisabledWhenSslValidationIsDisabled() {
+        var helloUrl = "https://localhost:" + port + "/";
+        String response = restTemplate.getForObject(helloUrl, String.class);
+        assertEquals(HELLO_WORLD_STRING, response);
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig5Test.java b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig5Test.java
new file mode 100644
index 0000000..cc23de5
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/config/ClampRestTemplateConfig5Test.java
@@ -0,0 +1,69 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.config;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import javax.net.ssl.SSLPeerUnverifiedException;
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.hello.HelloWorldApplication;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.web.client.RestClientException;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * In this test, we verify that SSL validation and hostname check are enabled
+ * by default. Thus we do not explicitly set the Spring properties
+ * clamp.disable-ssl-validation and clamp.disable-ssl-hostname-check.
+ * Since our keystore cert has a hostname 'helloworld' and our test request is
+ * to localhost, the request will fail with an SSLPeerUnverifiedException, as
+ * the SSL cert name does not match the server name 'localhost'.
+ */
+@SpringBootTest(
+    classes = { HelloWorldApplication.class, ClampRestTemplateConfig.class },
+    properties = {
+        "server.ssl.key-store=file:src/test/resources/helloworld-keystore.jks",
+        "server.ssl.key-store-password=changeit",
+        "server.ssl.trust-store=file:src/test/resources/helloworld-truststore.jks",
+        "server.ssl.trust-store-password=changeit",
+    },
+    webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class ClampRestTemplateConfig5Test {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    @Qualifier("clampRestTemplate")
+    private RestTemplate restTemplate;
+
+    @Test
+    void testSslValidationIsEnabledByDefault() {
+        var helloUrl = "https://localhost:" + port + "/";
+        Exception e = assertThrows(RestClientException.class,
+            () -> restTemplate.getForEntity(helloUrl, String.class));
+        assertTrue(e.getCause() instanceof SSLPeerUnverifiedException);
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/filters/ClientSslHeaderFilterTest.java b/gui-server/src/test/java/org/onap/policy/gui/server/filters/ClientSslHeaderFilterTest.java
new file mode 100644
index 0000000..5fc026d
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/filters/ClientSslHeaderFilterTest.java
@@ -0,0 +1,211 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.filters;
+
+import static org.apache.commons.collections4.CollectionUtils.isEqualCollection;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.onap.policy.gui.server.filters.ClientSslHeaderFilter.SSL_CERT_HEADER_NAME;
+import static org.onap.policy.gui.server.filters.ClientSslHeaderFilter.X509_ATTRIBUTE_NAME;
+import static org.onap.policy.gui.server.util.X509CertificateEncoder.urlDecodeCert;
+
+import java.io.IOException;
+import java.security.cert.X509Certificate;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.List;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+import org.onap.policy.gui.server.test.util.KeyStoreHelper;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+
+class ClientSslHeaderFilterTest {
+
+    /*
+     * If the client does not supply an SSL cert, the filter should not set
+     * the X-SSL-Cert header.
+     */
+    @Test
+    void testNoClientCert_noHeader() throws ServletException, IOException {
+        // Create a request without client SSL cert.
+        HttpServletRequest inRequest =  new MockHttpServletRequest();
+
+        // Apply the filter.
+        HttpServletRequest outRequest = applyRequestFilter(inRequest);
+
+        // The modified request should not contain cert header.
+        assertFalse(containsCertHeader(outRequest.getHeaderNames()));
+        assertNull(outRequest.getHeader(SSL_CERT_HEADER_NAME));
+        assertEquals(Collections.emptyEnumeration(), outRequest.getHeaders(SSL_CERT_HEADER_NAME));
+    }
+
+    /*
+     * If the client does supply an SSL cert, the filter should set the
+     * X-SSL-Cert header with the encoded SSL cert.
+     */
+    @Test
+    void testValidClientCert_hasHeader() throws Exception {
+        // Load valid cert from key store.
+        X509Certificate validCert = KeyStoreHelper.loadValidCert();
+
+        // Create a request with a valid client SSL cert.
+        MockHttpServletRequest inRequest = new MockHttpServletRequest();
+        inRequest.setAttribute(X509_ATTRIBUTE_NAME, new X509Certificate[] { validCert });
+
+        // Apply the filter.
+        HttpServletRequest outRequest = applyRequestFilter(inRequest);
+
+        // The modified request should contain a cert header.
+        assertTrue(containsCertHeader(outRequest.getHeaderNames()));
+
+        // Check if the cert header parses back to the original cert.
+        String headerValue = outRequest.getHeader(SSL_CERT_HEADER_NAME);
+        assertEquals(validCert, urlDecodeCert(headerValue));
+
+        // Verify the getHeaders method also returns cert.
+        assertEquals(headerValue, outRequest.getHeaders(SSL_CERT_HEADER_NAME).nextElement());
+    }
+
+    /*
+     * If the client supplies an expired SSL cert, the filter should not set
+     * the X-SSL-Cert header.
+     */
+    @Test
+    void testExpiredClientCert_noHeader() throws Exception {
+        // Load expired cert from key store.
+        X509Certificate expiredCert = KeyStoreHelper.loadExpiredCert();
+
+        // Create a request with an expired client SSL cert.
+        MockHttpServletRequest inRequest = new MockHttpServletRequest();
+        inRequest.setAttribute(X509_ATTRIBUTE_NAME, new X509Certificate[] { expiredCert });
+
+        // Apply the filter.
+        HttpServletRequest outRequest = applyRequestFilter(inRequest);
+
+        // The modified request should not contain a cert header.
+        assertFalse(containsCertHeader(outRequest.getHeaderNames()));
+        assertNull(outRequest.getHeader(SSL_CERT_HEADER_NAME));
+        assertEquals(Collections.emptyEnumeration(), outRequest.getHeaders(SSL_CERT_HEADER_NAME));
+    }
+
+    /*
+     * This test is needed to prevent a security vulnerability where a
+     * malicious user does not authenticate using client cert, but defines the
+     * X-SSL-Cert header themselves, thus gaining access without having the
+     * corresponding private key.
+     * We thus test that an incoming X-SSL-Cert header is sanitized.
+     */
+    @Test
+    void existingCertHeaderIsSanitized() throws Exception {
+        // Create a request with X-SSL-Cert header predefined.
+        MockHttpServletRequest inRequest = new MockHttpServletRequest();
+        inRequest.addHeader(SSL_CERT_HEADER_NAME, "somevalue");
+
+        // Apply the filter.
+        HttpServletRequest outRequest = applyRequestFilter(inRequest);
+
+        // The modified request should not contain a cert header.
+        assertFalse(containsCertHeader(outRequest.getHeaderNames()));
+        assertNull(outRequest.getHeader(SSL_CERT_HEADER_NAME));
+        assertEquals(Collections.emptyEnumeration(), outRequest.getHeaders(SSL_CERT_HEADER_NAME));
+    }
+
+    /*
+     * This test verifies that existing HTTP headers are preserved
+     *  (including multi-value headers).
+     */
+    @Test
+    void otherHeadersAreStillAccessible() throws Exception {
+        // Load valid cert from key store.
+        X509Certificate validCert = KeyStoreHelper.loadValidCert();
+
+        // Create a request with a valid client SSL cert and some existing headers.
+        MockHttpServletRequest inRequest = new MockHttpServletRequest();
+        inRequest.setAttribute(X509_ATTRIBUTE_NAME, new X509Certificate[] { validCert });
+        inRequest.addHeader("User-Agent", "Jupiter");
+        inRequest.addHeader("Accept-Language", "en-US");
+        inRequest.addHeader("Accept-Language", "en-IE");
+
+        // Apply the filter.
+        HttpServletRequest outRequest = applyRequestFilter(inRequest);
+
+        // The modified request contains the new cert header and the existing headers.
+        assertTrue(
+            isEqualCollection(
+                List.of("Accept-Language", "User-Agent", SSL_CERT_HEADER_NAME),
+                Collections.list(outRequest.getHeaderNames())));
+
+        // Verify getHeader method returns correct value.
+        String userAgent = outRequest.getHeader("User-Agent");
+        assertEquals("Jupiter", userAgent);
+
+        // Verify getHeaders method returns correct values.
+        Enumeration<String> acceptLanguages = outRequest.getHeaders("Accept-Language");
+        assertEquals("en-US", acceptLanguages.nextElement());
+        assertEquals("en-IE", acceptLanguages.nextElement());
+        assertFalse(acceptLanguages.hasMoreElements());
+    }
+
+    /**
+     * Apply the ClientSslToHeaderFilter to the input request,
+     * and return the modified request.
+     */
+    private HttpServletRequest applyRequestFilter(HttpServletRequest request) throws ServletException, IOException {
+        HttpServletResponse response = new MockHttpServletResponse();
+
+        // The filter calls filterChain::doFilter after processing the request,
+        // so capture the HttpServletRequest argument from filterChain::doFilter.
+        FilterChain filterChain = mock(FilterChain.class);
+        ArgumentCaptor<HttpServletRequest> requestCaptor = ArgumentCaptor.forClass(HttpServletRequest.class);
+        doNothing().when(filterChain).doFilter(requestCaptor.capture(), eq(response));
+
+        // Apply the filter.
+        Filter filter = new ClientSslHeaderFilter();
+        filter.doFilter(request, response, filterChain);
+
+        // Return the modified HttpServletRequest.
+        return requestCaptor.getValue();
+    }
+
+    /**
+     * Check if an Enumeration of header names contains the certificate header.
+     * Note HTTP header names are case insensitive.
+     */
+    private boolean containsCertHeader(Enumeration<String> headers) {
+        while (headers.hasMoreElements()) {
+            if (headers.nextElement().equalsIgnoreCase(SSL_CERT_HEADER_NAME)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/rest/ApexEditorRestControllerTest.java b/gui-server/src/test/java/org/onap/policy/gui/server/rest/ApexEditorRestControllerTest.java
new file mode 100644
index 0000000..4cfd994
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/rest/ApexEditorRestControllerTest.java
@@ -0,0 +1,61 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.rest;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.forwardedUrl;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.web.servlet.MockMvc;
+
+@SpringBootTest(
+    properties = {
+        "clamp.url=https://clamp-backend:8443/",
+        "clamp.disable-ssl-validation=true"
+    })
+@AutoConfigureMockMvc
+class ApexEditorRestControllerTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    @Test
+    void testStaticContentUrls() throws Exception {
+        mvc.perform(get("/apex-editor/"))
+            .andExpect(status().isOk())
+            .andExpect(forwardedUrl("/apex-editor/index.html"));
+
+        mvc.perform(get("/apex-editor"))
+            .andExpect(status().is3xxRedirection())
+            .andExpect(redirectedUrl("/apex-editor/"));
+    }
+
+    @Test
+    void testApexEditorRestForwarding() throws Exception {
+        mvc.perform(get("/apex-editor/policy/gui/v1/apex/editor/-1/Session/Create"))
+            .andExpect(forwardedUrl("/policy/gui/v1/apex/editor/-1/Session/Create"));
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/rest/ClampRestControllerTest.java b/gui-server/src/test/java/org/onap/policy/gui/server/rest/ClampRestControllerTest.java
new file mode 100644
index 0000000..fb3e843
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/rest/ClampRestControllerTest.java
@@ -0,0 +1,161 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.rest;
+
+import static org.onap.policy.gui.server.filters.ClientSslHeaderFilter.SSL_CERT_HEADER_NAME;
+import static org.onap.policy.gui.server.test.util.X509RequestPostProcessor.x509;
+import static org.onap.policy.gui.server.util.X509CertificateEncoder.urlEncodeCert;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.header;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.method;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
+import static org.springframework.test.web.client.response.MockRestResponseCreators.withStatus;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.forwardedUrl;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import java.security.cert.X509Certificate;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.KeyStoreHelper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.test.web.client.MockRestServiceServer;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.web.client.RestTemplate;
+
+@SpringBootTest(
+    properties = {
+        "clamp.url=https://clamp-backend:8443/",
+        "clamp.disable-ssl-validation=true"
+    })
+@AutoConfigureMockMvc
+class ClampRestControllerTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    @Autowired
+    @Qualifier("clampRestTemplate")
+    private RestTemplate restTemplate;
+
+    private MockRestServiceServer mockServer;
+
+    @BeforeEach
+    public void init() {
+        mockServer = MockRestServiceServer.createServer(restTemplate);
+    }
+
+    @Test
+    void testStaticContentUrls() throws Exception {
+        mvc.perform(get("/clamp/"))
+            .andExpect(status().isOk())
+            .andExpect(forwardedUrl("/clamp/index.html"));
+
+        mvc.perform(get("/clamp"))
+            .andExpect(status().is3xxRedirection())
+            .andExpect(redirectedUrl("/clamp/"));
+    }
+
+    /*
+     * This is a happy path test to verify that calls to /clamp/restservices/**
+     * are relayed to the clamp backend, and that the backend receives the
+     * client certificate encoded in a header. More extensive tests of the
+     * certificate cert filter are in ClientSslHeaderFilterTest.
+     */
+    @Test
+    void testClampProxyWithClientCert() throws Exception {
+        X509Certificate cert = KeyStoreHelper.loadValidCert();
+
+        mockServer.expect(
+            requestTo("https://clamp-backend:8443/restservices/junit/test"))
+            .andExpect(header(SSL_CERT_HEADER_NAME, urlEncodeCert(cert)))
+            .andRespond(withStatus(HttpStatus.OK).body("admin"));
+
+        mvc.perform(
+            get("/clamp/restservices/junit/test")
+                .with(x509(cert)))
+            .andExpect(status().isOk())
+            .andExpect(content().string("admin"));
+
+        mockServer.verify();
+    }
+
+    /*
+     * This test verifies that HTTP headers are preserved for requests to the
+     * clamp backend (including multi-value headers).
+     */
+    @Test
+    void verifyClampProxyPassesHeaders() throws Exception {
+        // Single value header
+        final String userAgent = "User-Agent";
+        final String userAgentValue = "JUnit";
+        // Multi value header
+        final String acceptLanguage = "Accept-Language";
+        final String enUs = "en-US";
+        final String enIe = "en-IE";
+
+        mockServer.expect(
+            requestTo("https://clamp-backend:8443/restservices/junit/test"))
+            .andExpect(method(HttpMethod.GET))
+            .andExpect(header(userAgent, userAgentValue))
+            .andExpect(header(acceptLanguage, enUs, enIe))
+            .andRespond(withStatus(HttpStatus.OK));
+
+        HttpHeaders requestHeaders = new HttpHeaders();
+        requestHeaders.set(userAgent, userAgentValue);
+        requestHeaders.add(acceptLanguage, enUs);
+        requestHeaders.add(acceptLanguage, enIe);
+        mvc.perform(
+            get("/clamp/restservices/junit/test")
+                .headers(requestHeaders))
+            .andExpect(status().isOk());
+
+        mockServer.verify();
+    }
+
+    /*
+     * This test verifies that error messages from the clamp backend are
+     * delivered to the client (as opposed to 500 "Internal Server Error").
+     */
+    @Test
+    void verifyClampProxyReturnsBackendErrorCode() throws Exception {
+        final String errorMessage = "This appliance cannot brew coffee";
+
+        mockServer.expect(
+            requestTo("https://clamp-backend:8443/restservices/coffee"))
+            .andRespond(withStatus(HttpStatus.I_AM_A_TEAPOT).body(errorMessage));
+
+        mvc.perform(
+            post("/clamp/restservices/coffee"))
+            .andExpect(status().is(HttpStatus.I_AM_A_TEAPOT.value()))
+            .andExpect(content().string(errorMessage));
+
+        mockServer.verify();
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/test/util/KeyStoreHelper.java b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/KeyStoreHelper.java
new file mode 100644
index 0000000..a4aabb8
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/KeyStoreHelper.java
@@ -0,0 +1,92 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.test.util;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.io.FileInputStream;
+import java.security.KeyStore;
+import java.security.cert.CertificateExpiredException;
+import java.security.cert.X509Certificate;
+import org.junit.jupiter.api.function.Executable;
+
+public class KeyStoreHelper {
+    /*
+     * The proxy test keystore contains certs with:
+     * - alias "valid": self-signed cert which expires circa year 2050
+     * - alias "expired": self-signed cert which expired in year 2000
+     */
+    private static final String KEY_STORE_PATH = "src/test/resources/keystore-proxytest.jks";
+    private static final String KEY_STORE_PASSWORD = "changeit";
+    private static final String KEY_STORE_TYPE = "JKS";
+    private static final String CERT_ALIAS_VALID = "valid";
+    private static final String CERT_ALIAS_EXPIRED = "expired";
+
+    /**
+     * Load a valid certificate from the test keystore.
+     */
+    public static X509Certificate loadValidCert() throws CouldNotLoadCertificateException {
+        X509Certificate cert = loadCertFromKeyStore(CERT_ALIAS_VALID);
+        assertDoesNotThrow((Executable) cert::checkValidity);
+        return cert;
+    }
+
+    /**
+     * Load an expired certificate from the test keystore.
+     */
+    public static X509Certificate loadExpiredCert() throws CouldNotLoadCertificateException {
+        X509Certificate cert = loadCertFromKeyStore(CERT_ALIAS_EXPIRED);
+        assertThrows(CertificateExpiredException.class, cert::checkValidity);
+        return cert;
+    }
+
+    /**
+     * Load a certificate with given alias from the test keystore.
+     */
+    private static X509Certificate loadCertFromKeyStore(String certAlias) throws CouldNotLoadCertificateException {
+        try {
+            KeyStore ks = KeyStore.getInstance(KEY_STORE_TYPE);
+            ks.load(new FileInputStream(KEY_STORE_PATH), KEY_STORE_PASSWORD.toCharArray());
+            X509Certificate cert = (X509Certificate) ks.getCertificate(certAlias);
+            if (cert == null) {
+                throw new CouldNotLoadCertificateException("Alias does not exist or does not contain a certificate.");
+            }
+            return cert;
+        } catch (Exception e) {
+            throw new CouldNotLoadCertificateException(
+                "Could not load cert with alias '" + certAlias + "' from test keystore.", e);
+        }
+    }
+
+    /**
+     * Exception class for KeyStoreHelper methods.
+     */
+    public static class CouldNotLoadCertificateException extends java.lang.Exception {
+        protected CouldNotLoadCertificateException(String errorMessage) {
+            super(errorMessage);
+        }
+
+        protected CouldNotLoadCertificateException(String errorMessage, Throwable err) {
+            super(errorMessage, err);
+        }
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/test/util/X509RequestPostProcessor.java b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/X509RequestPostProcessor.java
new file mode 100644
index 0000000..b1ef4a1
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/X509RequestPostProcessor.java
@@ -0,0 +1,46 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.test.util;
+
+import java.security.cert.X509Certificate;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.test.web.servlet.request.RequestPostProcessor;
+
+/**
+ * X509RequestPostProcessor is a test helper class for use with Spring MockMvc.
+ * It allows setting X509 certificates to a MockHttpServletRequest.
+ */
+public final class X509RequestPostProcessor implements RequestPostProcessor {
+    private final X509Certificate[] certificates;
+
+    public X509RequestPostProcessor(X509Certificate... certificates) {
+        this.certificates = certificates;
+    }
+
+    public MockHttpServletRequest postProcessRequest(MockHttpServletRequest request) {
+        request.setAttribute("javax.servlet.request.X509Certificate", this.certificates);
+        return request;
+    }
+
+    public static RequestPostProcessor x509(X509Certificate... certificates) {
+        return new X509RequestPostProcessor(certificates);
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/test/util/hello/HelloWorldApplication.java b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/hello/HelloWorldApplication.java
new file mode 100644
index 0000000..e584665
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/hello/HelloWorldApplication.java
@@ -0,0 +1,29 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.test.util.hello;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+// This class is used in tests for ClampRestTemplateConfig.
+@SpringBootApplication
+public class HelloWorldApplication {
+
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/test/util/hello/HelloWorldRestController.java b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/hello/HelloWorldRestController.java
new file mode 100644
index 0000000..71bd483
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/test/util/hello/HelloWorldRestController.java
@@ -0,0 +1,35 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.test.util.hello;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+// This class is used in tests for ClampRestTemplateConfig.
+@RestController
+public class HelloWorldRestController {
+    public static final String HELLO_WORLD_STRING = "Hello, World";
+
+    @RequestMapping("/")
+    public String greeting() {
+        return HELLO_WORLD_STRING;
+    }
+}
diff --git a/gui-server/src/test/java/org/onap/policy/gui/server/util/X509CertificateEncoderTest.java b/gui-server/src/test/java/org/onap/policy/gui/server/util/X509CertificateEncoderTest.java
new file mode 100644
index 0000000..28b1217
--- /dev/null
+++ b/gui-server/src/test/java/org/onap/policy/gui/server/util/X509CertificateEncoderTest.java
@@ -0,0 +1,47 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.gui.server.util;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import org.junit.jupiter.api.Test;
+import org.onap.policy.gui.server.test.util.KeyStoreHelper;
+
+class X509CertificateEncoderTest {
+
+    @Test
+    void testPemEncoder() throws KeyStoreHelper.CouldNotLoadCertificateException, CertificateException {
+        X509Certificate loadedCert = KeyStoreHelper.loadValidCert();
+        String pem = X509CertificateEncoder.getPemFromCert(loadedCert);
+        X509Certificate certFromPem = X509CertificateEncoder.getCertFromPem(pem);
+        assertEquals(loadedCert, certFromPem);
+    }
+
+    @Test
+    void testUrlEncoder() throws KeyStoreHelper.CouldNotLoadCertificateException, CertificateException {
+        X509Certificate loadedCert = KeyStoreHelper.loadValidCert();
+        String encodedCert = X509CertificateEncoder.urlEncodeCert(loadedCert);
+        X509Certificate decodedCert = X509CertificateEncoder.urlDecodeCert(encodedCert);
+        assertEquals(loadedCert, decodedCert);
+    }
+}
diff --git a/gui-server/src/test/resources/helloworld-keystore.jks b/gui-server/src/test/resources/helloworld-keystore.jks
new file mode 100644
index 0000000..c2f1a0e
--- /dev/null
+++ b/gui-server/src/test/resources/helloworld-keystore.jks
diff --git a/gui-server/src/test/resources/helloworld-truststore.jks b/gui-server/src/test/resources/helloworld-truststore.jks
new file mode 100644
index 0000000..64c123e
--- /dev/null
+++ b/gui-server/src/test/resources/helloworld-truststore.jks
diff --git a/gui-server/src/test/resources/keystore-proxytest.jks b/gui-server/src/test/resources/keystore-proxytest.jks
new file mode 100644
index 0000000..c261084
--- /dev/null
+++ b/gui-server/src/test/resources/keystore-proxytest.jks