diff --git a/backend/src/main/java/org/apache/jmeter/protocol/http/sampler/HTTPSamplerProxy.java b/backend/src/main/java/org/apache/jmeter/protocol/http/sampler/HTTPSamplerProxy.java
new file mode 100644
index 0000000000..dcf2d626ab
--- /dev/null
+++ b/backend/src/main/java/org/apache/jmeter/protocol/http/sampler/HTTPSamplerProxy.java
@@ -0,0 +1,149 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you 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.
+ */
+
+package org.apache.jmeter.protocol.http.sampler;
+
+import io.metersphere.commons.utils.LogUtil;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.jmeter.engine.event.LoopIterationEvent;
+import org.apache.jmeter.samplers.Interruptible;
+
+import java.net.URL;
+
+/**
+ * Proxy class that dispatches to the appropriate HTTP sampler.
+ * <p>
+ * This class is stored in the test plan, and holds all the configuration settings.
+ * The actual implementation is created at run-time, and is passed a reference to this class
+ * so it can get access to all the settings stored by HTTPSamplerProxy.
+ */
+public final class HTTPSamplerProxy extends HTTPSamplerBase implements Interruptible {
+
+    private static final long serialVersionUID = 1L;
+
+    private transient HTTPAbstractImpl impl;
+
+    public HTTPSamplerProxy() {
+        super();
+    }
+
+    /**
+     * Convenience method used to initialise the implementation.
+     *
+     * @param impl the implementation to use.
+     */
+    public HTTPSamplerProxy(String impl) {
+        super();
+        setImplementation(impl);
+    }
+
+    protected String toExternalForm(URL u) {
+        int len = u.getProtocol().length() + 1;
+        if (u.getAuthority() != null && u.getAuthority().length() > 0)
+            len += 2 + u.getAuthority().length();
+        if (u.getPath() != null) {
+            len += u.getPath().length();
+        }
+        if (u.getQuery() != null) {
+            len += 1 + u.getQuery().length();
+        }
+        if (u.getRef() != null)
+            len += 1 + u.getRef().length();
+
+        StringBuffer result = new StringBuffer(len);
+        result.append(u.getProtocol());
+        result.append(":");
+        if (u.getAuthority() != null && u.getAuthority().length() > 0) {
+            result.append("//");
+            result.append(u.getAuthority());
+        }
+        if (StringUtils.isNotEmpty(u.getPath())) {
+            int index = 0;
+            for (int i = 0; i < u.getPath().length(); i++) {
+                char ch = u.getPath().charAt(i);
+                if (String.valueOf(ch).equals("/")) {
+                    index++;
+                } else {
+                    break;
+                }
+            }
+            result.append("/" + u.getPath().substring(index));
+        }
+        if (u.getQuery() != null) {
+            result.append('?');
+            result.append(u.getQuery());
+        }
+        if (u.getRef() != null) {
+            result.append("#");
+            result.append(u.getRef());
+        }
+        return result.toString();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected HTTPSampleResult sample(URL u, String method, boolean areFollowingRedirect, int depth) {
+        // When Retrieve Embedded resources + Concurrent Pool is used
+        // as the instance of Proxy is cloned, we end up with impl being null
+        // testIterationStart will not be executed but it's not a problem for 51380 as it's download of resources
+        // so SSL context is to be reused
+        if (impl == null) { // Not called from multiple threads, so this is OK
+            try {
+                impl = HTTPSamplerFactory.getImplementation(getImplementation(), this);
+            } catch (Exception ex) {
+                return errorResult(ex, new HTTPSampleResult());
+            }
+        }
+        try {
+            String url = toExternalForm(u);
+            u = new URL(url);
+        } catch (Exception ex) {
+            LogUtil.error(ex);
+        }
+        return impl.sample(u, method, areFollowingRedirect, depth);
+    }
+
+    // N.B. It's not possible to forward threadStarted() to the implementation class.
+    // This is because Config items are not processed until later, and HTTPDefaults may define the implementation
+
+    @Override
+    public void threadFinished() {
+        if (impl != null) {
+            impl.threadFinished(); // Forward to sampler
+        }
+    }
+
+    @Override
+    public boolean interrupt() {
+        if (impl != null) {
+            return impl.interrupt(); // Forward to sampler
+        }
+        return false;
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase#testIterationStart(org.apache.jmeter.engine.event.LoopIterationEvent)
+     */
+    @Override
+    public void testIterationStart(LoopIterationEvent event) {
+        if (impl != null) {
+            impl.notifyFirstSampleAfterLoopRestart();
+        }
+    }
+}